Search for charged-lepton-flavour violation in Z-boson decays with the ATLAS detector

被引：11

作者：

Aad, G. ^{[1
]}

Abbott, B. ^{[2
]}

Abbott, D. C. ^{[3
]}

Abud, A. Abed ^{[4
]}

Abeling, K. ^{[5
]}

Abhayasinghe, D. K. ^{[6
]}

Abidi, S. H. ^{[7
]}

Abou Zeid, O. S. ^{[8
]}

Abraham, N. L. ^{[9
]}

Abramowicz, H. ^{[10
]}

Abreu, H. ^{[11
]}

Abulaiti, Y. ^{[12
]}

Acharya, B. S. ^{[13
,14
,265
]}

Achkar, B. ^{[5
]}

Adam, L. ^{[15
]}

Bourdarios, C. Adam ^{[16
]}

Adamczyk, L. ^{[17
]}

Adamek, L. ^{[7
]}

Adelman, J. ^{[18
]}

Adiguzel, A. ^{[19
,39
,266
]}

Adorni, S. ^{[20
]}

Adye, T. ^{[21
]}

Affolder, A. A. ^{[22
]}

Afik, Y. ^{[11
]}

Agapopoulou, C. ^{[23
]}

Agaras, M. N. ^{[24
]}

Aggarwal, A. ^{[25
]}

Agheorghiesei, C. ^{[26
]}

Aguilar-Saavedra, J. A. ^{[27
,28
,29
,30
,267
]}

Ahmad, A. ^{[4
]}

Ahmadov, F. ^{[31
]}

Ahmed, W. S. ^{[32
]}

Ai, X.

Aielli, G. ^{[35
,36
]}

Akatsuka, S. ^{[37
]}

Akbiyik, M. ^{[15
]}

Akesson, T. P. A. ^{[38
]}

Akilli, E. ^{[20
]}

Akimov, A. V. ^{[39
]}

Al Khoury, K. ^{[23
]}

Alberghi, G. L. ^{[40
,41
,42
]}

Albert, J. ^{[43
]}

Verzini, M. J. Alconada ^{[10
]}

Alderweireldt, S. ^{[4
]}

Aleksa, M. ^{[4
]}

Aleksandrov, I. N. ^{[31
]}

Alexa, C. ^{[44
]}

Alexopoulos, T. ^{[45
]}

Alfonsi, A. ^{[46
,47
]}

Alfonsi, F. ^{[40
,41
,42
]}

机构：

[1] Aix Marseille Univ, CNRS, IN2P3, CPPM, Marseille, France

[2] Univ Oklahoma, Homer L Dodge Dept Phys & Astron, Norman, OK 73019 USA

[3] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA

[4] CERN, Geneva, Switzerland

[5] Georg August Univ Gottingen, Phys Inst 2, Gottingen, Germany

[6] Royal Holloway Univ London, Dept Phys, Egham, Surrey, England

[7] Univ Toronto, Dept Phys, Toronto, ON, Canada

[8] Univ Copenhagen, Niels Bohr Inst, Copenhagen, Denmark

[9] Univ Sussex, Dept Phys & Astron, Brighton, E Sussex, England

[10] Tel Aviv Univ, Raymond & Beverly Sackler Sch Phys & Astron, Tel Aviv, Israel

[11] Technion Israel Inst Technol, Dept Phys, Haifa, Israel

[12] Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA

[13] INFN Grp Collegato Udine, Sez Trieste, Udine, Italy

[14] Abdus Salaam Int Ctr Theoret Phys, Trieste, Italy

[15] Johannes Gutenberg Univ Mainz, Inst Phys, Mainz, Germany

[16] Univ Savoie Mt Blanc, Univ Grenoble Alpes, IN2P3, LAPP,CNRS, Annecy, France

[17] AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, Krakow, Poland

[18] Northern Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

[19] Bogazici Univ, Dept Phys, Istanbul, Turkey

[20] Univ Geneva, Dept Phys Nucl & Corpusculaire, Geneva, Switzerland

[21] Rutherford Appleton Lab, Particle Phys Dept, Didcot, Oxon, England

[22] Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA

[23] Univ Paris Saclay, CNRS, IN2P3, IJCLab, Orsay, France

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

[25] Radboud Univ Nijmegen, Nikhef, Inst Math Astrophys & Particle Phys, Nijmegen, Netherlands

[26] Alexandru Ioan Cuza Univ, Dept Phys, Iasi, Romania

[27] Lab Instrumentacao & Fis Expt Particulas LIP, Lisbon, Portugal

[28] Univ Granada, Dept Fis Teor & Cosmos, Granada, Spain

[29] Univ Nova Lisboa, Fac Ciencias & Tecnol, Dept Fis, Caparica, Portugal

[30] Univ Nova Lisboa, Fac Ciencias & Tecnol, CEFITEC, Caparica, Portugal

[31] Joint Inst Nucl Res, Dubna, Russia

[32] McGill Univ, Dept Phys, Montreal, PQ, Canada

[33] Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA USA

[34] Univ Calif Berkeley, Berkeley, CA 94720 USA

[35] INFN, Sez Roma Tor Vergata, Rome, Italy

[36] Univ Roma Tor Vergata, Dipartimento Fis, Rome, Italy

[37] Kyoto Univ, Fac Sci, Kyoto, Japan

[38] Lund Univ, Fys Inst, Lund, Sweden

[39] Russian Acad Sci, PN Lebedev Phys Inst, Moscow, Russia

[40] INFN, Dipartimento Fis, Bologna, Italy

[41] Univ Bologna, Bologna, Italy

[42] INFN, Sez Bologna, Bologna, Italy

[43] Univ Victoria, Dept Phys & Astron, Victoria, BC, Canada

[44] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest, Romania

[45] Natl Tech Univ Athens, Dept Phys, Zografos, Greece

[46] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands

[47] Univ Amsterdam, Amsterdam, Netherlands

[48] Czech Tech Univ, Prague, Czech Republic

[49] Acad Sinica, Inst Phys, Taipei, Taiwan

[50] Tomsk State Univ, Tomsk, Russia

来源：

NATURE PHYSICS | 2021年 / 17卷 / 07期

基金：

加拿大自然科学与工程研究理事会; 巴西圣保罗研究基金会;

关键词：

Branching fractions - Centre-of-mass energies - Experimental evidence - Fundamental principles - Large Hadron Collider - Proton collisions - The standard model - Weak interactions;

D O I：

10.1038/s41567-021-01225-z

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Leptons with essentially the same properties apart from their mass are grouped into three families (or flavours). The number of leptons of each flavour is conserved in interactions, but this is not imposed by fundamental principles. Since the formulation of the standard model of particle physics, the observation of flavour oscillations among neutrinos has shown that lepton flavour is not conserved in neutrino weak interactions. So far, there has been no experimental evidence that this also occurs in interactions between charged leptons. Such an observation would be a sign of undiscovered particles or a yet unknown type of interaction. Here the ATLAS experiment at the Large Hadron Collider at CERN reports a constraint on lepton-flavour-violating effects in weak interactions, searching for Z-boson decays into a tau lepton and another lepton of different flavour with opposite electric charge. The branching fractions for these decays are measured to be less than 8.1 x 10(-6) (e tau) and 9.5 x 10(-6) (mu tau) at the 95% confidence level using 139 fb(-1) of proton-proton collision data at a centre-of-mass energy of root s = 13 TeV and 20.3 fb(-1) at root s = 8 TeV. These results supersede the limits from the Large Electron-Positron Collider experiments conducted more than two decades ago.

引用

页码：819 / +

页数：24

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