List F, Park Y, Rodd NL
… +2 more, Schoen E, Wolf F
Phys Rev Lett
· 2026 Jun · PMID 42360937
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The Galactic Center Excess (GCE) may yet herald the discovery of annihilating dark matter. Weighing against that conclusion are analyses showing evidence for dim point sources within the spatial structure of the emission...The Galactic Center Excess (GCE) may yet herald the discovery of annihilating dark matter. Weighing against that conclusion are analyses showing evidence for dim point sources within the spatial structure of the emission. Because of technical limitations these analyses are purely spatial with all spectral information that could disentangle the excess from astrophysical backgrounds discarded. Here, we demonstrate that a neural network simulation-based inference approach can jointly analyze the spatial and spectra data. The addition is profound: energy information drives the putative point sources to be significantly dimmer, indicating either the GCE is truly diffuse in nature or made of an exceptionally large number of sources. Quantitatively, for our best fit background model, the excess is essentially consistent with Poisson emission as predicted by dark matter. If due to point sources, our median prediction is O(10^{5}) sources, or more than 35 000 at 90% confidence-both orders of magnitude larger than the hundreds preferred by earlier point-source analyses of the GCE, although variations allowed by background systematics could reduce the required number of sources by roughly an order of magnitude.
Bastianello A, Zeng Y, Dhar S
… +7 more, Wang Z, Yu X, Horvath M, Astrakharchik GE, Guo Y, Nägerl HC, Landini M
Phys Rev Lett
· 2026 Jun · PMID 42360936
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Critical quantum field theories occupy a central position in modern theoretical physics for their inherent universality stemming from long-range correlations. As an example, the Tomonaga-Luttinger liquid (TLL) describes...Critical quantum field theories occupy a central position in modern theoretical physics for their inherent universality stemming from long-range correlations. As an example, the Tomonaga-Luttinger liquid (TLL) describes a wealth of one-dimensional quantum systems at low temperatures. Its behavior is deeply rooted in the emergence of an effective Fermi sea, leading to power-law correlations and Friedel oscillations. A promising direction to realize systems exhibiting novel universal behavior beyond TLL is through the generalization of the underlying Fermi sea. In this Letter, we show that fractional Fermi seas with reduced occupancy arise in an integrable Bose gas driven out of equilibrium by cyclic changes in interactions across the full range of repulsive and attractive regimes. The correlation functions feature signatures of criticality incompatible with a conventional TLL, suggesting a novel critical phase. Our predictions, based on generalized hydrodynamics, are directly relevant to cold atoms.
Phys Rev Lett
· 2026 Jun · PMID 42360935
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Transverse-mode control of light has traditionally relied on optical cavities, whereas recent cavity-free approaches based on periodically arranged cold atoms that exploit collective radiation have attracted increasing a...Transverse-mode control of light has traditionally relied on optical cavities, whereas recent cavity-free approaches based on periodically arranged cold atoms that exploit collective radiation have attracted increasing attention. Here, we demonstrate a new cavity-free method applicable to thermal gases. Using crossed femtosecond laser pulses, we excite rubidium atoms and observe superfluorescence (SF) emitted during an ultrafast relaxation process. We demonstrate successful control of the transverse modes of SF when the interference fringes formed by the crossed beams are resonant with half the SF wavelength. This ultrafast, cavity-free approach provides a versatile playground for studying interactions between quantum many-body systems and well-defined electromagnetic fields in free space.
Ming H, Wang J, Xu S
… +4 more, Jabar B, Zheng Y, Luo ZZ, Zou Z
Phys Rev Lett
· 2026 Jun · PMID 42360934
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Cationic lone-pair electrons are often associated with distinctive phonon properties (e.g., strong lattice anharmonicity) that lead to low lattice thermal conductivity (κ_{L}). However, the reliance on specific cations (...Cationic lone-pair electrons are often associated with distinctive phonon properties (e.g., strong lattice anharmonicity) that lead to low lattice thermal conductivity (κ_{L}). However, the reliance on specific cations (e.g., Sb^{3+} or Ge^{2+}) severely restricts the broader applicability of this lone-pair-based strategy. In this Letter, anionic lone-pair-like electrons (LPEs) were successfully introduced in the high-symmetry diamondoid compound AgInSnSe_{4} through cation-deficient cross-substitution, achieving an ultralow κ_{L} of 0.23 W m^{-1} K^{-1} at 773 K. The LPEs of Se atoms significantly weaken the long-range Se-Se interactions and Ag-Se bonding. This effect localizes the optical phonon modes, resulting in ultralow group velocities and strong scattering rates among optical phonons, minimizing the particlelike propagation contribution to heat transport. This finding extends the concept of LPEs-driven phonon blocking from cations to anions, revealing a mechanism fundamentally distinct from the anharmonicity-driven suppression observed in cationic lone-pair systems.
Abumusabh M, Adachi I, Adamczyk K
… +441 more, Aggarwal L, Ahmed H, Ahn Y, Aihara H, Akopov N, Alghamdi S, Alhakami M, Aloisio A, Althubiti N, Amos K, Anh Ky N, Antonioli C, Asner DM, Atmacan H, Aushev T, Aversano M, Ayad R, Babu V, Bae H, Baghel NK, Bahinipati S, Bambade P, Banerjee S, Barrett M, Bartl M, Baudot J, Baur A, Beaubien A, Becherer F, Becker J, Bennett JV, Bernlochner FU, Bertacchi V, Bertemes M, Bertholet E, Bessner M, Bettarini S, Bhardwaj V, Bhuyan B, Bianchi F, Bilka T, Biswas D, Bobrov A, Bodrov D, Bondar A, Bonvicini G, Borah J, Boschetti A, Bozek A, Bračko M, Branchini P, Briere RA, Browder TE, Budano A, Bussino S, Campagna Q, Campajola M, Cao L, Casarosa G, Cecchi C, Chang MC, Chang P, Cheema P, Chen L, Cheon BG, Cheshta C, Chetri H, Chilikin K, Chin J, Chirapatpimol K, Cho HE, Cho K, Cho SJ, Choi SK, Choudhury S, Colorado-Caicedo JA, Consigny I, Corona L, Cui JX, De La Cruz-Burelo E, De La Motte SA, de Marino G, De Nardo G, De Pietro G, de Sangro R, Destefanis M, Dey S, Di Canto A, Dingfelder J, Doležal Z, Domínguez Jiménez I, Dong TV, Dong X, Dugic K, Dujany G, Ecker P, Farkas R, Feichtinger P, Ferber T, Fillinger T, Finck C, Finocchiaro G, Forti F, Frey A, Fulsom BG, Gabrielli A, Gale A, Ganiev E, Garcia-Hernandez M, Garg R, Gärtner L, Gaudino G, Gaur V, Gautam V, Gaz A, Gellrich A, Ghevondyan G, Ghosh D, Ghumaryan H, Giakoustidis G, Giordano R, Giri A, Gironella Gironell P, Glazov A, Gobbo B, Godang R, Gogota O, Goldenzweig P, Gradl W, Graziani E, Greenwald D, Guan Y, Gudkova K, Haide I, Han Y, Harris C, Hayashii H, Hazra S, Hearty C, Hedges MT, Heidelbach A, Heine G, Heredia de la Cruz I, Hernández Villanueva M, Higuchi T, Hoek M, Hohmann M, Hoppe R, Horak P, Hou XT, Hsu CL, Huang A, Humair T, Iijima T, Inami K, Inguglia G, Ipsita N, Ishikawa A, Itoh R, Iwasaki M, Jackson P, Jacobi D, Jacobs WW, Jaffe DE, Jang EJ, Ji QP, Jia S, Jin Y, Johnson A, Joo KK, Kaliyar AB, Kandra J, Kang KH, Kang S, Karyan G, Kawasaki T, Keil F, Ketter C, Kiesling C, Kim CH, Kim DY, Kim JY, Kim KH, Kim YK, Kindo H, Kinoshita K, Kodyš P, Koga T, Kohani S, Kojima K, Korobov A, Korpar S, Kovalenko E, Kowalewski R, Križan P, Krokovny P, Kuhr T, Kulii Y, Kumar D, Kumara K, Kunigo T, Kuzmin A, Kwon YJ, Lacaprara S, Lalwani K, Lam T, Lange JS, Lau TS, Laurenza M, Leboucher R, Le Diberder FR, Lee H, Lee MJ, Lemettais C, Leo P, Lewis PM, Li C, Li HJ, Li LK, Li QM, Li SX, Li WZ, Li Y, Li YB, Liao YP, Libby J, Lin J, Lin S, Liptak Z, Liu MH, Liu QY, Liu Y, Liu Z, Liventsev D, Longo S, Lozar A, Lueck T, Luo T, Lyu C, Ma JL, Ma Y, Maggiora M, Maharana SP, Maiti R, Mancinelli G, Manfredi R, Manoni E, Mantovano M, Marcantonio D, Marcello S, Marinas C, Martellini C, Martens A, Martinov T, Massaccesi L, Masuda M, Matvienko D, Maurya SK, Maushart M, McKenna JA, Mediankin Gruberová Z, Mehta R, Meier F, Meleshko D, Merola M, Miller C, Mirra M, Mitra S, Miyabayashi K, Miyake H, Mizuk R, Mohanty GB, Mondal S, Moneta S, Moreira de Carvalho AL, Moser HG, Mrvar M, Murakami H, Mussa R, Nakamura I, Nakao M, Nakazawa Y, Naruki M, Natkaniec Z, Natochii A, Nayak M, Neu M, Nishida S, Nomaru R, Ogawa S, Okubo R, Ono H, Onuki Y, Otani F, Pakhlova G, Panta A, Pardi S, Parham K, Park J, Park SH, Paschen B, Passeri A, Patra S, Paul S, Pedlar TK, Peruzzi I, Pestotnik R, Piccolo M, Piilonen LE, Podesta-Lerma PLM, Podobnik T, Praz C, Prell S, Prencipe E, Prim MT, Privalov S, Prudiiev I, Purwar H, Rados P, Raeuber G, Raiz S, Raj V, Ravindran K, Rehman JU, Reif M, Reiter S, Reuter L, Ricalde Herrmann D, Ripp-Baudot I, Rizzo G, Robertson SH, Roney JM, Rostomyan A, Rout N, Salutari L, Sanders DA, Sandilya S, Santelj L, Santos C, Savinov V, Scavino B, Schmitt C, Schneider S, Schnepf M, Schoenning K, Schwanda C, Seino Y, Selce A, Senyo K, Serrano J, Sevior ME, Sfienti C, Shan W, Sharma G, Shi XD, Shillington T, Shimasaki T, Shiu JG, Shtol D, Shwartz B, Sibidanov A, Simon F, Singh JB, Skorupa J, Sobie RJ, Sobotzik M, Soffer A, Sokolov A, Solovieva E, Spataro S, Špenko K, Spruck B, Starič M, Stavroulakis P, Stefkova S, Stroili R, Sumihama M, Sumisawa K, Suwonjandee N, Svidras H, Takahashi M, Takizawa M, Tamponi U, Tanaka S, Tang SS, Tanida K, Tenchini F, Testa F, Thaller A, Tien Manh T, Tittel O, Tiwary R, Torassa E, Trantou FF, Tsaklidis I, Uchida M, Ueda I, Uglov T, Unger K, Unno Y, Uno K, Uno S, Urquijo P, Ushiroda Y, Vahsen SE, van Tonder R, Varvell KE, Veronesi M, Vismaya VS, Vitale L, Vobbilisetti V, Volpe R, Wakai M, Wallner S, Wang MZ, Wang XL, Wang Z, Warburton A, Watanuki S, Wessel C, Won E, Xu XP, Yamada S, Yan W, Yang SB, Yelton J, Yi K, Yin JH, Yoshihara K, Yuan CZ, Yuan J, Zani L, Zeng F, Zeyrek M, Zhang B, Zhilich V, Zhou JS, Zhou QD, Zhu L, Žlebčík R, Belle II Collaboration
Phys Rev Lett
· 2026 Jun · PMID 42360933
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We report the first search for the flavor-changing neutral-current decays B→X_{s}νν[over ¯], where X_{s} is a hadronic system with strangeness equal to 1, in data collected with the Belle II detector at the SuperKEKB asy...We report the first search for the flavor-changing neutral-current decays B→X_{s}νν[over ¯], where X_{s} is a hadronic system with strangeness equal to 1, in data collected with the Belle II detector at the SuperKEKB asymmetric-energy e^{+}e^{-} collider. The data sample corresponds to an integrated luminosity of 365 fb^{-1} collected at the ϒ(4S) resonance and 43 fb^{-1} collected at a center-of-mass energy 60 MeV below resonance for estimation of e^{+}e^{-}→qq[over ¯] continuum background. One of the B mesons from the ϒ(4S)→BB[over ¯] decay is fully reconstructed in a hadronic decay mode. The B→X_{s}νν[over ¯] decay is reconstructed with a sum-of-exclusives approach that uses 30 X_{s} decay modes. This approach provides high sensitivity to the inclusive decay, despite the presence of two undetected neutrinos. The search is performed in three regions of the X_{s} mass, M_{X_{s}}^{true}, chosen to separate contributions from K, K^{*}(892), and heavier strange final states. We do not observe a significant signal and set upper limits at 90% confidence level on the partial branching fractions for the regions 0.0<M_{X_{s}}^{true}<0.6 GeV/c^{2}, 0.6<M_{X_{s}}^{true}<1.0 GeV/c^{2}, and 1.0 GeV/c^{2}<M_{X_{s}}^{true} of 2.2×10^{-5}, 9.3×10^{-5}, and 30.9×10^{-5}, respectively. Combining the three mass regions, we obtain the upper limit on the branching fraction, B(B→X_{s}νν[over ¯])<3.3×10^{-4}.
Ablikim M, Achasov MN, Adlarson P
… +719 more, Ai XC, Aliberti R, Amoroso A, An Q, Bai Y, Bakina O, Ban Y, Bao HR, Batozskaya V, Begzsuren K, Berger N, Berlowski M, Bertani M, Bettoni D, Bianchi F, Bianco E, Bortone A, Boyko I, Briere RA, Brueggemann A, Cai H, Cai MH, Cai X, Calcaterra A, Cao GF, Cao N, Cetin SA, Chai XY, Chang JF, Che GR, Che YZ, Chen CH, Chen C, Chen G, Chen HS, Chen HY, Chen ML, Chen SJ, Chen SL, Chen SM, Chen T, Chen XR, Chen XT, Chen XY, Chen YB, Chen YQ, Chen YQ, Chen Z, Chen ZJ, Chen ZK, Choi SK, Chu X, Cibinetto G, Cossio F, Cottee-Meldrum J, Cui JJ, Dai HL, Dai JP, Dbeyssi A, de Boer RE, Dedovich D, Deng CQ, Deng ZY, Denig A, Denysenko I, Destefanis M, De Mori F, Ding B, Ding XX, Ding Y, Ding Y, Ding YX, Dong J, Dong LY, Dong MY, Dong X, Du MC, Du SX, Du SX, Duan YY, Egorov P, Fan GF, Fan JJ, Fan YH, Fang J, Fang J, Fang SS, Fang WX, Fang YQ, Farinelli R, Fava L, Feldbauer F, Felici G, Feng CQ, Feng JH, Feng L, Feng QX, Feng YT, Fritsch M, Fu CD, Fu JL, Fu YW, Gao H, Gao XB, Gao Y, Gao YN, Gao YN, Gao YY, Garbolino S, Garzia I, Ge PT, Ge ZW, Geng C, Gersabeck EM, Gilman A, Goetzen K, Gong JD, Gong L, Gong WX, Gradl W, Gramigna S, Greco M, Gu MH, Gu YT, Guan CY, Guo AQ, Guo LB, Guo MJ, Guo RP, Guo YP, Guskov A, Gutierrez J, Han KL, Han TT, Hanisch F, Hao KD, Hao XQ, Harris FA, He KK, He KL, Heinsius FH, Heinz CH, Heng YK, Herold C, Hong PC, Hou GY, Hou XT, Hou YR, Hou ZL, Hu HM, Hu JF, Hu QP, Hu SL, Hu T, Hu Y, Hu ZM, Huang GS, Huang KX, Huang LQ, Huang P, Huang XT, Huang YP, Huang YS, Hussain T, Hüsken N, In der Wiesche N, Jackson J, Ji Q, Ji QP, Ji W, Ji XB, Ji XL, Ji YY, Jia ZK, Jiang D, Jiang HB, Jiang PC, Jiang SJ, Jiang TJ, Jiang XS, Jiang Y, Jiao JB, Jiao JK, Jiao Z, Jin S, Jin Y, Jing MQ, Jing XM, Johansson T, Kabana S, Kalantar-Nayestanaki N, Kang XL, Kang XS, Kavatsyuk M, Ke BC, Khachatryan V, Khoukaz A, Kiuchi R, Kolcu OB, Kopf B, Kuessner M, Kui X, Kumar N, Kupsc A, Kühn W, Lan Q, Lan WN, Lei TT, Lellmann M, Lenz T, Li C, Li C, Li C, Li CH, Li CK, Li DM, Li F, Li G, Li HB, Li HJ, Li HN, Li H, Li JR, Li JS, Li K, Li KL, Li KL, Li LJ, Li L, Li MH, Li MR, Li PL, Li PR, Li QM, Li QX, Li R, Li SX, Li T, Li TY, Li WD, Li WG, Li X, Li XH, Li XL, Li XY, Li XZ, Li Y, Li YG, Li YP, Li ZJ, Li ZY, Liang H, Liang YF, Liang YT, Liao GR, Liao LB, Liao MH, Liao YP, Libby J, Limphirat A, Lin CC, Lin DX, Lin LQ, Lin T, Liu BJ, Liu BX, Liu C, Liu CX, Liu F, Liu FH, Liu F, Liu GM, Liu H, Liu HB, Liu HH, Liu HM, Liu H, Liu JB, Liu JJ, Liu K, Liu K, Liu KY, Liu K, Liu LC, Liu L, Liu MH, Liu PL, Liu Q, Liu SB, Liu T, Liu WK, Liu WM, Liu WT, Liu X, Liu X, Liu XK, Liu XY, Liu Y, Liu Y, Liu Y, Liu YB, Liu ZA, Liu ZD, Liu ZQ, Lou XC, Lu FX, Lu HJ, Lu JG, Lu XL, Lu Y, Lu YH, Lu YP, Lu ZH, Luo CL, Luo JR, Luo JS, Luo MX, Luo T, Luo XL, Lv ZY, Lyu XR, Lyu YF, Lyu YH, Ma FC, Ma HL, Ma JL, Ma LL, Ma LR, Ma QM, Ma RQ, Ma RY, Ma T, Ma XT, Ma XY, Ma YM, Maas FE, MacKay I, Maggiora M, Malde S, Malik QA, Mao HX, Mao YJ, Mao ZP, Marcello S, Marshall A, Melendi FM, Meng YH, Meng ZX, Mezzadri G, Miao H, Min TJ, Mitchell RE, Mo XH, Moses B, Muchnoi NY, Muskalla J, Nefedov Y, Nerling F, Nie LS, Nikolaev IB, Ning Z, Nisar S, Niu QL, Niu WD, Normand C, Olsen SL, Ouyang Q, Pacetti S, Pan X, Pan Y, Pathak A, Pei YP, Pelizaeus M, Peng HP, Peng XJ, Peng YY, Peters K, Petridis K, Ping JL, Ping RG, Plura S, Prasad V, Qi FZ, Qi HR, Qi M, Qian S, Qian WB, Qiao CF, Qiao JH, Qin JJ, Qin JL, Qin LQ, Qin LY, Qin PB, Qin XP, Qin XS, Qin ZH, Qiu JF, Qu ZH, Rademacker J, Redmer CF, Rivetti A, Rolo M, Rong G, Rong SS, Rosini F, Rosner C, Ruan MQ, Salone N, Sarantsev A, Schelhaas Y, Schoenning K, Scodeggio M, Shan KY, Shan W, Shan XY, Shang ZJ, Shangguan JF, Shao LG, Shao M, Shen CP, Shen HF, Shen WH, Shen XY, Shi BA, Shi H, Shi JL, Shi JY, Shi SY, Shi X, Song HL, Song JJ, Song TZ, Song WM, Song YJ, Song YX, Sosio S, Spataro S, Stieler F, Su SS, Su YJ, Sun GB, Sun GX, Sun H, Sun HK, Sun JF, Sun K, Sun L, Sun SS, Sun T, Sun YC, Sun YH, Sun YJ, Sun YZ, Sun ZQ, Sun ZT, Tang CJ, Tang GY, Tang J, Tang JJ, Tang LF, Tang YA, Tao LY, Tat M, Teng JX, Tian JY, Tian WH, Tian Y, Tian ZF, Uman I, Wang B, Wang B, Wang B, Wang C, Wang C, Wang C, Wang DY, Wang HJ, Wang JJ, Wang K, Wang LL, Wang LW, Wang M, Wang M, Wang NY, Wang S, Wang T, Wang TJ, Wang W, Wang W, Wang WP, Wang X, Wang XF, Wang XJ, Wang XL, Wang XN, Wang Y, Wang YD, Wang YF, Wang YH, Wang YJ, Wang YL, Wang YN, Wang YQ, Wang Y, Wang Y, Wang Y, Wang Z, Wang ZL, Wang ZL, Wang ZQ, Wang ZY, Wei DH, Wei HR, Weidner F, Wen SP, Wen YR, Wiedner U, Wilkinson G, Wolke M, Wu C, Wu JF, Wu LH, Wu LJ, Wu LJ, Wu L, Wu SG, Wu SM, Wu X, Wu XH, Wu YJ, Wu Z, Xia L, Xian XM, Xiang BH, Xiao D, Xiao GY, Xiao H, Xiao YL, Xiao ZJ, Xie C, Xie KJ, Xie XH, Xie Y, Xie YG, Xie YH, Xie ZP, Xing TY, Xu CF, Xu CJ, Xu GF, Xu HY, Xu HY, Xu M, Xu QJ, Xu QN, Xu TD, Xu W, Xu WL, Xu XP, Xu Y, Xu Y, Xu YC, Xu ZS, Yan F, Yan HY, Yan L, Yan WB, Yan WC, Yan WH, Yan WP, Yan XQ, Yang HJ, Yang HL, Yang HX, Yang JH, Yang RJ, Yang T, Yang Y, Yang YF, Yang YH, Yang YQ, Yang YX, Yang YZ, Ye M, Ye MH, Ye ZJ, Yin J, You ZY, Yu BX, Yu CX, Yu G, Yu JS, Yu LQ, Yu MC, Yu T, Yu XD, Yu YC, Yuan CZ, Yuan H, Yuan J, Yuan J, Yuan L, Yuan SC, Yuan XQ, Yuan Y, Yuan ZY, Yue CX, Yue Y, Zafar AA, Zeng SH, Zeng X, Zeng Y, Zeng YJ, Zeng YJ, Zhai XY, Zhan YH, Zhang AQ, Zhang BL, Zhang BX, Zhang DH, Zhang GY, Zhang GY, Zhang H, Zhang H, Zhang HC, Zhang HH, Zhang HQ, Zhang HR, Zhang HY, Zhang J, Zhang J, Zhang JJ, Zhang JL, Zhang JQ, Zhang JS, Zhang JW, Zhang JX, Zhang JY, Zhang JZ, Zhang J, Zhang LM, Zhang L, Zhang N, Zhang P, Zhang Q, Zhang QY, Zhang RY, Zhang SH, Zhang S, Zhang XM, Zhang XY, Zhang XY, Zhang Y, Zhang Y, Zhang YT, Zhang YH, Zhang YM, Zhang YP, Zhang ZD, Zhang ZH, Zhang ZL, Zhang ZL, Zhang ZX, Zhang ZY, Zhang ZY, Zhang ZZ, Zhang ZZ, Zhao G, Zhao JY, Zhao JZ, Zhao L, Zhao L, Zhao MG, Zhao N, Zhao RP, Zhao SJ, Zhao YB, Zhao YL, Zhao YX, Zhao ZG, Zhemchugov A, Zheng B, Zheng BM, Zheng JP, Zheng WJ, Zheng XR, Zheng YH, Zhong B, Zhong C, Zhou H, Zhou JQ, Zhou JY, Zhou S, Zhou X, Zhou XK, Zhou XR, Zhou XY, Zhou YX, Zhou YZ, Zhu AN, Zhu J, Zhu K, Zhu KJ, Zhu KS, Zhu L, Zhu LX, Zhu SH, Zhu TJ, Zhu WD, Zhu WD, Zhu WJ, Zhu WZ, Zhu YC, Zhu ZA, Zhuang XY, Zou JH, Zu J, BESIII Collaboration
Phys Rev Lett
· 2026 Jun · PMID 42360932
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The combined symmetry of charge conjugation and parity (CP) is tested in the hadronic transition ψ(3686)→π^{+}π^{-}J/ψ, using a dataset of (2712.4±14.3)×10^{6} ψ(3686) events collected by the BESIII detector at the BEPC...The combined symmetry of charge conjugation and parity (CP) is tested in the hadronic transition ψ(3686)→π^{+}π^{-}J/ψ, using a dataset of (2712.4±14.3)×10^{6} ψ(3686) events collected by the BESIII detector at the BEPCII collider. The resulting asymmetry observable is A_{CP}=(0.6±1.8±0.1)×10^{-4}, which is determined by combining the two channels J/ψ→e^{+}e^{-} and J/ψ→μ^{+}μ^{-}. Additionally, by considering the relationship between the chromoelectric dipole moment (CEDM) and the A_{CP} observable derived from the quantum chromodynamics multipole expansion theory based on the Chen-Kuang model and the Cornell potential model, we obtain the results of charm quark's CEDM with d_{c}^{'}=(2.6±7.8±0.4±0.6)×10^{-16} e cm, and d_{c}^{'}=(3.5±10.5±0.6±0.5)×10^{-16} e cm, respectively. The uncertainties are statistical, systematic, and theoretical, respectively. These results correspond to an upper limit of |d_{c}^{'}|<2.1×10^{-15} e cm at 90% confidence level, representing an order of magnitude improvement in sensitivity compared to the previous direct bound using the same decay process.
Phys Rev Lett
· 2026 Jun · PMID 42360931
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In nondegenerate SU(1,1) interferometers, beam splitters are replaced by two-mode squeezers, enabling sub-shot-noise sensitivity without input squeezing and robustness to detection losses by quantum entanglement. We prop...In nondegenerate SU(1,1) interferometers, beam splitters are replaced by two-mode squeezers, enabling sub-shot-noise sensitivity without input squeezing and robustness to detection losses by quantum entanglement. We propose a hybrid implementation in optomechanics where one "arm" is a mechanical mode undergoing two consecutive, mode-matched interactions with a traveling optical field (constituting the other arm). Such engineered interactions allow for sub-shot-noise phase detection even in the presence of mechanical thermal noise and optical losses, advancing precision interferometry in hybrid systems.
Phys Rev Lett
· 2026 Jun · PMID 42360930
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Tetrahedral symmetry has long been predicted as an exotic shape degree of freedom in atomic nuclei, yet clear experimental manifestations remain elusive. We show that the triple binding energy difference δV_{pn}^{(3)} ca...Tetrahedral symmetry has long been predicted as an exotic shape degree of freedom in atomic nuclei, yet clear experimental manifestations remain elusive. We show that the triple binding energy difference δV_{pn}^{(3)} can isolate a structural effect of tetrahedral symmetry in ^{80}Zr. Using relativistic density functional theory solved on a three-dimensional lattice without symmetry restrictions, the experimental δV_{pn}^{(3)} values for even-even ^{80-90}Zr isotopes are well reproduced without adjustable parameters. While an enhancement of δV_{pn}^{(3)} near N≃Z is commonly attributed to proton-neutron correlations beyond the mean field, the pronounced nonmonotonic peak at N=40 emerges at the mean field level only when the tetrahedral degree of freedom is included. Constraining the tetrahedral deformation to zero removes the peak and leads to clear deviations from experiment. The anomaly is traced to a well-localized tetrahedral minimum in ^{80}Zr, supported by potential energy surfaces and characteristic single-particle level splittings. Calculations restricted to quadrupole and triaxial shapes fail to reproduce the localized enhancement, indicating that the effect is not a generic proton-neutron correlation but a symmetry-selective increase of proton-neutron binding associated with tetrahedral geometry. We, therefore, identify the δV_{pn}^{(3)} anomaly in ^{80}Zr as a structural mechanism distinct from the conventional Wigner-type enhancement and show that nuclear masses constitute a sensitive probe of tetrahedral symmetry.
Zhao Z, Wu D, Zhang C
… +7 more, Cao D, Zheng H, Huang Y, Wang Q, Wang EG, Guo C, Jiang Y
Phys Rev Lett
· 2026 Jun · PMID 42360929
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Achieving resonant detection and coherent control of phonons with simultaneous nanometer spatial and femtosecond temporal precision is of great importance for developing phonon-based technologies, yet remains a long-stan...Achieving resonant detection and coherent control of phonons with simultaneous nanometer spatial and femtosecond temporal precision is of great importance for developing phonon-based technologies, yet remains a long-standing challenging task. In this Letter, we succeed to fabricate nanoscale coherent phonons with broadband frequency tunability using a femtosecond laser-combined scanning tunneling microscope. An ultrafast photocurrent, enhanced by localized surface plasmons, was used to track the high-frequency mechanical motion of nanoclusters at their intrinsic length and time scales. We demonstrate that the coherent acoustic phonon modes of the nanoclusters can be launched by the impulsive pressure of plasmon-induced hot electrons and that their frequency can be tuned by the size of the nanoparticles. Through tip manipulation, we generated a series of on-tip coherent phonons with an ultrabroad frequency range spanning from 15 GHz to 1 THz in a highly controlled manner. Such a tip with broadband-tunable coherent phonons holds great promise for detecting high-frequency mechanical and electromagnetic fluctuations in resonant modes.
Phys Rev Lett
· 2026 Jun · PMID 42330483
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The mass law is a cornerstone in predicting sound transmission loss, yet it neglects the constraints of causal dispersion. Current causality-based theories, such as the Rozanov limit, are applicable only to one-port refl...The mass law is a cornerstone in predicting sound transmission loss, yet it neglects the constraints of causal dispersion. Current causality-based theories, such as the Rozanov limit, are applicable only to one-port reflective absorbers. Here, we derive a universal sum rule governing causal scattering in acoustic systems, establishing a rigorous analogy to the Baldin sum rule in quantum field theory. This relation reveals that the integral of the extinction cross section is fundamentally locked by the scatterer's static effective mass and stiffness, which is validated numerically using seminal examples of underwater metamaterials. Furthermore, the proposed sum rule predicts an optimal condition for an anomalously broadened transmission loss bandwidth, as experimentally observed through the spectral shaping effect of an acoustic Fano resonator. Our findings open up an unexplored avenue for enhancing the scattering bandwidth of passive metamaterials.
Phys Rev Lett
· 2026 Jun · PMID 42330482
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We present a single-quench protocol that generates unitary k-designs with minimal control. A system first evolves under a random Hamiltonian H_{1}; at a switch time t_{s}≥t_{Th} (the Thouless time), it is quenched to an...We present a single-quench protocol that generates unitary k-designs with minimal control. A system first evolves under a random Hamiltonian H_{1}; at a switch time t_{s}≥t_{Th} (the Thouless time), it is quenched to an independently drawn H_{2} from the same ensemble and then evolves under H_{2}. This single quench breaks residual spectral correlations that prevent strictly time-independent chaotic dynamics from forming higher-order designs. The resulting ensemble approaches a unitary k-design using only a single control operation-far simpler than Brownian schemes with continuously randomized couplings or protocols that apply random quenches at short time intervals. Our analytical results are derived for Gaussian unitary random matrices, while our numerical demonstrations are carried out primarily in the Sachdev-Ye-Kitaev model. Beyond offering a direct route to Haar-like randomness, the protocol yields an operational, measurement-friendly definition of t_{Th} and provides a quantitative diagnostic of chaoticity. It further suggests symmetry-resolved and open-system extensions, circuit-level single-quench analogs, and applications to randomized measurements, benchmarking, and tomography.
Fukaya Y, Lu B, Yada K
… +2 more, Tanaka Y, Cayao J
Phys Rev Lett
· 2026 Jun · PMID 42330481
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Superconducting altermagnets have proven to be a promising ground for emergent phenomena, but their study has involved two-dimensional systems. In this work, we investigate three-dimensional d- and g-wave altermagnets wi...Superconducting altermagnets have proven to be a promising ground for emergent phenomena, but their study has involved two-dimensional systems. In this work, we investigate three-dimensional d- and g-wave altermagnets with spin-singlet chiral d-wave superconductivity and show the formation of crossed surface flat bands due to the interplay between superconducting and altermagnetic symmetries. We find that these crossed flat bands are topologically protected, appear at zero energy in the surface along z due to the superconducting nodal lines in the xy plane, and their number of corners is determined by the crystal symmetry of altermagnets. We also show that the superconducting nodal lines give rise to Bogoliubov-Fermi surfaces, which then affect the appearance of zero-energy arcs in the surface along x. Moreover, we demonstrate that the crossed flat bands or surface arcs, and Bogoliubov-Fermi surfaces give rise to the coexistence of three distinct dependences of the charge conductance on the normal transparency, hence offering a solid way for their detection and paving the way for realizing higher-dimensional topological phases using altermagnets.
Phys Rev Lett
· 2026 Jun · PMID 42330480
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The interaction between free electrons and optical modes underlies a variety of quantum and nanoscale light-matter phenomena, yet the associated momentum exchange with the sample largely remained overlooked. Here, we exp...The interaction between free electrons and optical modes underlies a variety of quantum and nanoscale light-matter phenomena, yet the associated momentum exchange with the sample largely remained overlooked. Here, we experimentally demonstrate the momentum transfer from free electrons to planar samples during optical mode excitation using momentum-resolved electron energy-loss spectroscopy. The momentum transfer to the sample modifies the apparent dispersion relation which is significant when the planar sample is tilted. Under specific conditions, the sample receives momentum opposite to the electron beam direction.
Phys Rev Lett
· 2026 Jun · PMID 42330479
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We provide evidence that dynamical slowdown in glass-forming liquids may follow different microscopic routes under cooling and compression, pointing to a previously unrecognized discrepancy between two dynamical landmark...We provide evidence that dynamical slowdown in glass-forming liquids may follow different microscopic routes under cooling and compression, pointing to a previously unrecognized discrepancy between two dynamical landmarks: the Arrhenius-to-non-Arrhenius crossover associated with cooling and the inflection point emerging under compression. This separation suggests the coexistence of two distinct mechanisms governing dynamical slowdown and naturally supports the dynamic facilitation framework already at small supercoolings. Based on simulations, we further show that it is the inflection point, rather than the Arrhenius-to-non-Arrhenius crossover, that is more directly associated with the growth of dynamical heterogeneity.
Phys Rev Lett
· 2026 Jun · PMID 42330478
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We develop a theory that predicts the equilibrium states of a fluid contained in a capillary that has corners. Each section of the tube can take three states: completely wet state where the tube section is completely occ...We develop a theory that predicts the equilibrium states of a fluid contained in a capillary that has corners. Each section of the tube can take three states: completely wet state where the tube section is completely occupied by the fluid, partially wet state where only the corners are occupied by the fluid known as corner film or finger, and completely dry state. We calculate the phase diagram of these states for a square tube with rounded corners. It is shown that the partially wet state can exist only in a certain region in the parameter space spanned by the equilibrium contact angle and the corner curvature.
Sears J, Garlea VO, Lederman D
… +2 more, Tranquada JM, Zaliznyak IA
Phys Rev Lett
· 2026 Jun · PMID 42330477
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FeF_{2} is a prototypical rutile antiferromagnet recently proposed as an altermagnet, with a magnetic symmetry that permits spin-split electronic bands and chiral magnons. Using very-high-resolution inelastic neutron sca...FeF_{2} is a prototypical rutile antiferromagnet recently proposed as an altermagnet, with a magnetic symmetry that permits spin-split electronic bands and chiral magnons. Using very-high-resolution inelastic neutron scattering on a single crystal of FeF_{2}, we show that the dominant source of magnon splitting is in fact the long-range dipolar interaction rather than altermagnetic exchange terms. At momenta where the dipolar splitting vanishes, we observe additional broadening due to altermagnetic chiral splitting and estimate this splitting to be ∼35 μeV. Polarized measurements further reveal that, where dipolar splitting is present, the chiral magnon modes become mixed and the resulting modes are predominantly linearly polarized, with at most a small chiral component. These findings highlight the significant effect of dipolar interactions on magnon chirality, particularly when altermagnetic interactions are weak.
Purushu Melath S, Hauck M, Lochmann C
… +4 more, Wild R, Softley TP, Dulitz K, Wester R
Phys Rev Lett
· 2026 Jun · PMID 42330476
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Photodetachment spectroscopy of C_{2}^{-} anions across the thresholds to the two lowest electronic states of neutral C_{2} was carried out using rotationally cold trapped ions. The electron detachment was observed to fo...Photodetachment spectroscopy of C_{2}^{-} anions across the thresholds to the two lowest electronic states of neutral C_{2} was carried out using rotationally cold trapped ions. The electron detachment was observed to follow p- and s-wave threshold behavior for transitions to the C_{2}X^{1}Σ_{g}^{+}(v^{'}=0) and C_{2}a^{3}Π_{u}(v^{'}=0) states, respectively, in agreement with the threshold laws derived by Wigner [Phys. Rev. 73, 1002 (1948)PHRVAO0031-899X10.1103/PhysRev.73.1002]. The ions were prepared at two different rotational temperatures, using a temperature-variable cryogenic 16-pole wire trap at 8 and 142 K, respectively. By fitting the two thresholds, an accurate value of the adiabatic electron affinity of C_{2} was determined as 26364.2±0.5 cm^{-1}. The energy of the p-wave threshold was found to be particularly insensitive to rotational excitation, due to the absence of P- and R-branch excitations. The new electron affinity deviates significantly from a recent measurement using photoelectron spectroscopy [Laws et al. Nat. Commun. 10, 5199 (2019)NCAOBW2041-172310.1038/s41467-019-13039-y].
Phys Rev Lett
· 2026 Jun · PMID 42330475
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The three-dimensional classical O(N) model with a boundary has received renewed interest due to the discovery of the extraordinary-log boundary universality class for 2≤N<N_{c}. The critical value N_{c} and the exponent...The three-dimensional classical O(N) model with a boundary has received renewed interest due to the discovery of the extraordinary-log boundary universality class for 2≤N<N_{c}. The critical value N_{c} and the exponent of the boundary correlation function are related to certain amplitudes in the normal universality class. To determine their precise values, we revisit the 3D O(N) boundary conformal field theory for N=1, 2, 3, 4, 5. After substantially improving the accuracy of the boundary bootstrap, our determinations are in excellent agreement with the Monte Carlo results, resolving the previous discrepancies due to low truncation orders. We also use the recent bulk bootstrap results to deduce highly accurate Ising data. Many bulk and boundary predictions are obtained for the first time. Our results demonstrate the great potential of the η minimization method for many unexplored bootstrap problems in which positivity constraints are absent.
Altangerel M, Badoux S, Proust C
… +2 more, Vignolles D, Rikken GLJA
Phys Rev Lett
· 2026 Jun · PMID 42330474
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We report the experimental observation of magnetochiral anisotropy in the longitudinal and transverse ultrasound propagation in α quartz. To perform such measurement, we have built an ultrasound spectrometer with unprece...We report the experimental observation of magnetochiral anisotropy in the longitudinal and transverse ultrasound propagation in α quartz. To perform such measurement, we have built an ultrasound spectrometer with unprecedented experimental resolution of the order of Δv/v∼10^{-8}. We present a simple macroscopic Becquerel-like analytical model that accounts for the magnitude of the observed effect and its frequency dependence.