Test of lepton universality in beauty-quark decays

被引：165

作者：

Aaij, R. ^{[1
]}

Beteta, C. Abellan ^{[2
]}

Ackernley, T. ^{[3
]}

Adeva, B. ^{[4
]}

Adinolfi, M. ^{[5
]}

Afsharnia, H. ^{[6
]}

Aidala, C. A. ^{[7
]}

Aiola, S. ^{[8
]}

Ajaltouni, Z. ^{[6
]}

Akar, S. ^{[9
]}

Albrecht, J. ^{[10
]}

Alessio, F. ^{[11
]}

Alexander, M. ^{[12
]}

Alfonso Albero, A. ^{[13
]}

Aliouche, Z. ^{[14
]}

Alkhazov, G. ^{[15
]}

Cartelle, P. Alvarez ^{[16
]}

Amato, S. ^{[17
]}

Amhis, Y. ^{[18
]}

An, L. ^{[11
]}

Anderlini, L. ^{[19
]}

Andreianov, A. ^{[15
]}

Andreotti, M. ^{[20
]}

Archilli, F. ^{[21
]}

Artamonov, A. ^{[22
]}

Artuso, M. ^{[23
]}

Arzymatov, K. ^{[24
]}

Aslanides, E. ^{[25
]}

Atzeni, M. ^{[2
]}

Audurier, B. ^{[26
]}

Bachmann, S. ^{[21
]}

Bachmayer, M. ^{[27
]}

Back, J. J. ^{[28
]}

Baladron Rodriguez, P. ^{[4
]}

Balagura, V ^{[26
]}

Baldini, W. ^{[20
]}

Leite, J. Baptista ^{[29
]}

Barlow, R. J. ^{[14
]}

Barsuk, S. ^{[18
]}

Barter, W. ^{[30
]}

Bartolini, M. ^{[31
]}

Baryshnikov, F. ^{[32
]}

Basels, J. M. ^{[33
]}

Bassi, G. ^{[34
]}

Batsukh, B. ^{[23
]}

Battig, A. ^{[10
]}

Bay, A. ^{[27
]}

Becker, M. ^{[10
]}

Bedeschi, F. ^{[34
]}

Bediaga, I ^{[29
]}

机构：

[1] Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands

[2] Univ Zurich, Phys Inst, Zurich, Switzerland

[3] Univ Liverpool, Oliver Lodge Lab, Liverpool, Merseyside, England

[4] Univ Santiago de Compostela, Inst Galego Fis Altas Enerxias IGFAE, Santiago De Compostela, Spain

[5] Univ Bristol, HH Wills Phys Lab, Bristol, Avon, England

[6] Univ Clermont Auvergne, LPC, CNRS IN2P3, Clermont Ferrand, France

[7] Univ Michigan, Ann Arbor, MI 48109 USA

[8] Ist Nazl Fis Nucl, Sez Milano, Milan, Italy

[9] Univ Cincinnati, Cincinnati, OH USA

[10] Tech Univ Dortmund, Fak Phys, Dortmund, Germany

[11] European Org Nucl Res CERN, Geneva, Switzerland

[12] Univ Glasgow, Sch Phys & Astron, Glasgow, Lanark, Scotland

[13] Univ Barcelona, ICCUB, Barcelona, Spain

[14] Univ Manchester, Dept Phys & Astron, Manchester, Lancs, England

[15] NRC Kurchatov Inst PNPI, Petersburg Nucl Phys Inst, Gatchina, Russia

[16] Univ Cambridge, Cavendish Lab, Cambridge, England

[17] Univ Fed Rio de Janeiro UFRJ, Rio De Janeiro, Brazil

[18] Univ Paris Saclay, IJCLAB, CNRS IN2P3, Orsay, France

[19] Ist Nazl Fis Nucl, Sez Firenze, Florence, Italy

[20] Ist Nazl Fis Nucl, Sez Ferrara, Ferrara, Italy

[21] Heidelberg Univ, Phys Inst, Heidelberg, Germany

[22] NRC Kurchatov Inst IHEP NRC, Inst High Energy Phys, Protvino, Russia

[23] Syracuse Univ, Syracuse, NY USA

[24] Yandex Sch Data Anal, Moscow, Russia

[25] Aix Marseille Univ, cPPM, CNRS IN2P3, Marseille, France

[26] Ecole Polytech, Lab Leprince Ringuet, Inst Polytech Paris, CNRS IN2P3, Palaiseau, France

[27] Ecole Polytech Fed Lausanne EPFL, Inst Phys, Lausanne, Switzerland

[28] Univ Warwick, Dept Phys, Coventry, W Midlands, England

[29] Ctr Brasileiro Pesquisas Fis CBPF, Rio De Janeiro, Brazil

[30] Imperial Coll London, London, England

[31] Ist Nazl Fis Nucl, Sez Genova, Genoa, Italy

[32] Natl Univ Sci & Technol MISIS, Moscow, Russia

[33] Rhein Westfal TH Aachen, Phys Inst 1, Aachen, Germany

[34] Ist Nazl Fis Nucl, Sez Pisa, Pisa, Italy

[35] Ist Nazl Fis Nucl, Sez Cagliari, Monserrato, Italy

[36] Moscow State Univ SINP MSU, Inst Nucl Phys, Moscow, Russia

[37] NRC Kurchatov Inst ITEP, Inst Theoret & Expt Phys, Moscow, Russia

[38] Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy

[39] Sorbonne Univ, Paris Diderot Sorbonne Paris Cite, LPNHE, CNRS IN2P3, Paris, France

[40] Univ Padua, Padua, Italy

[41] Ist Nazl Fis Nucl, Padua, Italy

[42] Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, Krakow, Poland

[43] Wuhan Univ, Sch Phys & Technol, Wuhan, Peoples R China

[44] Univ Birmingham, Birmingham, W Midlands, England

[45] Univ Modena & Reggio Emilia, Modena, Italy

[46] Univ Oxford, Dept Phys, Oxford, England

[47] MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[48] Natl Res Univ Higher Sch Econ, Moscow, Russia

[49] Budker Inst Nucl Phys SB RAS, Novosibirsk, Russia

[50] Univ Maryland, College Pk, MD 20742 USA

来源：

NATURE PHYSICS | 2022年 / 18卷 / 03期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1038/s41567-021-01478-8

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The standard model of particle physics currently provides our best description of fundamental particles and their interactions. The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak interaction strengths. Previous measurements have shown that a wide range of particle decays are consistent with this principle of lepton universality. This article presents evidence for the breaking of lepton universality in beauty-quark decays, with a significance of 3.1 standard deviations, based on proton–proton collision data collected with the LHCb detector at CERN’s Large Hadron Collider. The measurements are of processes in which a beauty meson transforms into a strange meson with the emission of either an electron and a positron, or a muon and an antimuon. If confirmed by future measurements, this violation of lepton universality would imply physics beyond the standard model, such as a new fundamental interaction between quarks and leptons. © 2022, The Author(s), under exclusive licence to Springer Nature Limited.

引用

页码：277 / +

页数：25

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