Test of the universality of τ and μ lepton couplings in W-boson decays with the ATLAS detector

被引：29

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
]}

AbouZeid, O. S. ^{[8
]}

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

Abramowicz, H. ^{[10
]}

Abreu, H. ^{[11
]}

Abulaiti, Y. ^{[12
]}

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

Achkar, B. ^{[5
]}

Adam, L. ^{[15
]}

Bourdarios, C. Adam ^{[16
]}

Adamczyk, L. ^{[17
]}

Adamek, L. ^{[7
]}

Adelman, J. ^{[18
]}

Adersberger, M. ^{[19
]}

Adiguzel, A. ^{[20
]}

Adorni, S. ^{[21
]}

Adye, T. ^{[22
]}

Affolder, A. A. ^{[23
]}

Afik, Y. ^{[11
]}

Agapopoulou, C. ^{[24
]}

Agaras, M. N. ^{[25
]}

Aggarwal, A. ^{[26
]}

Agheorghiesei, C. ^{[27
]}

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

Ahmad, A. ^{[4
]}

Ahmadov, F. ^{[30
]}

Ahmed, W. S. ^{[31
]}

Ai, X. ^{[32
,33
]}

Aielli, G. ^{[34
,35
]}

Akatsuka, S. ^{[36
]}

Akbiyik, M. ^{[15
]}

Akesson, T. P. A. ^{[37
]}

Akilli, E. ^{[21
]}

Akimov, A., V ^{[38
]}

Al Khoury, K. ^{[24
]}

Alberghi, G. L. ^{[39
,40
,41
]}

Albert, J. ^{[42
]}

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

Alderweireldt, S. ^{[4
]}

Aleksa, M. ^{[4
]}

Aleksandrov, I. N. ^{[30
]}

Alexa, C. ^{[43
]}

Alexopoulos, T. ^{[44
]}

Alfonsi, A. ^{[45
,46
]}

机构：

[1] Aix Marseille Univ, CPPM, CNRS IN2P3, 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, High Energy Phys Div, 9700 S Cass Ave, Argonne, IL 60439 USA

[13] Ist Nazl Fis Nucl, 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 Grenoble Alpes, Univ Savoie Mt Blanc, LAPP, CNRS IN2P3, 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] Ludwig Maximilians Univ Munchen, Fak Phys, Munich, Germany

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

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

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

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

[24] Univ Paris Saclay, IJCLab, CNRS IN2P3, F-91405 Orsay, France

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

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

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

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

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

[30] Joint Inst Nucl Res, Dubna, Russia

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

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

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

[34] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy

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

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

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

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

[39] INFN Bologna, Dipartimento Fis, Bologna, Italy

[40] Univ Bologna, Bologna, Italy

[41] Ist Nazl Fis Nucl, Sez Bologna, Bologna, Italy

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

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

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

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

[46] Univ Amsterdam, Amsterdam, Netherlands

[47] Czech Tech Univ, Prague, Czech Republic

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

[49] Tomsk State Univ, Tomsk, Russia

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

来源：

NATURE PHYSICS | 2021年 / 17卷 / 07期

基金：

巴西圣保罗研究基金会; 加拿大自然科学与工程研究理事会; 欧盟地平线“2020”;

关键词：

PARTON DISTRIBUTIONS; PAIR PRODUCTION; PLUS PLUS; PHYSICS;

D O I：

10.1038/s41567-021-01236-w

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The standard model of particle physics encapsulates our best current understanding of physics at the smallest scales. A fundamental axiom of this theory is the universality of the couplings of the different generations of leptons to the electroweak gauge bosons. The measurement of the ratio of the decay rate of W bosons to t leptons and muons, R(tau/mu), constitutes an important test of this axiom. Using 139 fb(-1) of proton-proton collisions recorded with the ATLAS detector at a centre-of-mass energy of 13 TeV, we report a measurement of this quantity from di-leptonic tt events where the top quarks decay into a W boson and a bottom quark. We can distinguish muons originating from W bosons and those originating from an intermediate t lepton through the muon transverse impact parameter and differences in the muon transverse momentum spectra. The measured value of R(tau/mu) is 0.992 +/- 0.013 [+/- 0.007(stat) +/- 0.011(syst)] and is in agreement with the hypothesis of universal lepton couplings as postulated in the standard model. This is the only such measurement from the Large Hadron Collider, so far, and obtains twice the precision of previous measurements.

引用

页码：813 / +

页数：21

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Alfonsi, A.
Alfonsi, F.
PHYSICAL REVIEW D, 2023, 108 (03)

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共 50 条

[31] Measurement of differential cross sections and W+/W- cross-section ratios for W boson production in association with jets at √s=8 TeV with the ATLAS detector
Aaboud, M.
Aad, G.
Abbott, B.
Abdinov, O.
Abeloos, B.
Abidi, S. H.
AbouZeid, O. S.
Abraham, N. L.
Abramowicz, H.
Abreu, H.
Abreu, R.
Abulaiti, Y.
Acharya, B. S.
Adachi, S.
Adamczyk, L.
Adelman, J.
Adersberger, M.
Adye, T.
Affolder, A. A.
Afik, Y.
Agheorghiesei, C.
Aguilar-Saavedra, J. A.
Ahlen, S. P.
Ahmadov, F.
Aielli, G.
Akatsuka, S.
Akerstedt, H.
Akesson, T. P. A.
Akilli, E.
Akimov, A. V.
Alberghi, G. L.
Albert, J.
Albicocco, P.
Verzini, M. J. Alconada
Alderweireldt, S. C.
Aleksa, M.
Aleksandrov, I. N.
Alexa, C.
Alexander, G.
Alexopoulos, T.
Alhroob, M.
Ali, B.
Aliev, M.
Alimonti, G.
Alison, J.
Alkire, S. P.
Allbrooke, B. M. M.
Allen, B. W.
Allport, P. P.
Aloisio, A.
JOURNAL OF HIGH ENERGY PHYSICS, 2018, (05):
[32] Measurement of W±-boson and Z-boson production cross-sections in pp collisions at √s=2.76 TeV with the ATLAS detector
Aaboud, M.
Aad, G.
Abbott, B.
Abdinov, O.
Abeloos, B.
Abhayasinghe, D. K.
Abidi, S. H.
AbouZeid, O. S.
Abraham, N. L.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Acharya, B. S.
Adachi, S.
Adamczyk, L.
Adelman, J.
Adersberger, M.
Adiguzel, A.
Adye, T.
Affolder, A. A.
Afik, Y.
Agheorghiesei, C.
Aguilar-Saavedra, J. A.
Ahmadov, F.
Aielli, G.
Akatsuka, S.
Akesson, T. P. A.
Akilli, E.
Akimov, A. V.
Alberghi, G. L.
Albert, J.
Albicocco, P.
Alconada Verzini, M. J.
Alderweireldt, S.
Aleksa, M.
Aleksandrov, I. N.
Alexa, C.
Alexopoulos, T.
Alhroob, M.
Ali, B.
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EUROPEAN PHYSICAL JOURNAL C, 2019, 79 (11):
[33] Measurement of jet-substructure observables in top quark, W boson and light jet production in proton-proton collisions at √s=13 TeV with the ATLAS detector
Aaboud, M.
Aad, G.
Abbott, B.
Abbott, D. C.
Abdinov, O.
Abud, A. Abed
Abhayasinghe, D. K.
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AbouZeid, O. S.
Abraham, N. L.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Acharya, B. S.
Adachi, S.
Adam, L.
Bourdarios, C. Adam
Adamczyk, L.
Adamek, L.
Adelman, J.
Adersberger, M.
Adiguzel, A.
Adorni, S.
Adye, T.
Affolder, A. A.
Afik, Y.
Agapopoulou, C.
Agaras, M. N.
Aggarwal, A.
Agheorghiesei, C.
Aguilar-Saavedra, J. A.
Ahmadov, F.
Ai, X.
Aielli, G.
Akatsuka, S.
Akesson, T. P. A.
Akilli, E.
Akimov, A., V
Al Khoury, K.
Alberghi, G. L.
Albert, J.
Verzini, M. J. Alconada
Alderweireldt, S.
Aleksa, M.
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Alexa, C.
Alexandre, D.
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Alfonsi, A.
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JOURNAL OF HIGH ENERGY PHYSICS, 2019, (08):
[34] Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton plus jets final states produced in pp collisions at √s=8 TeV
Khachatryan, V.
Sirunyan, A. M.
Tumasyan, A.
Adam, W.
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[35] Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s=8 TeV
Aad, G.
Abbott, B.
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Abud, A. Abed
Abeling, K.
Abhayasinghe, D. K.
Abidi, S. H.
AbouZeid, O. S.
Abraham, N. L.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Acharya, B. S.
Achkar, B.
Adam, L.
Bourdarios, C. Adam
Adamczyk, L.
Adamek, L.
Adelman, J.
Adersberger, M.
Adiguzel, A.
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Agapopoulou, C.
Agaras, M. N.
Aggarwal, A.
Agheorghiesei, C.
Aguilar-Saavedra, J. A.
Ahmad, A.
Ahmadov, F.
Ahmed, W. S.
Ai, X.
Aielli, G.
Akatsuka, S.
Akesson, T. P. A.
Akilli, E.
Akimov, A., V
Al Khoury, K.
Alberghi, G. L.
Albert, J.
Verzini, M. J. Alconada
Alderweireldt, S.
Aleksa, M.
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Alexa, C.
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JOURNAL OF HIGH ENERGY PHYSICS, 2020, (08):
[36] Measurement of total and differential W plus w- production cross sections in proton-proton collisions at √s=8 TeV with the ATLAS detector and limits on anomalous triple-gauge-boson couplings
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Akesson, T. P. A.
Akimov, A. V.
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Aleksa, M.
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Alexa, C.
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Alhroob, M.
Alimonti, G.
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Alonso, A.
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JOURNAL OF HIGH ENERGY PHYSICS, 2016, (09):
[37] Search for doubly charged scalar bosons decaying into same-sign W boson pairs with the ATLAS detector
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Aad, G.
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Adersberger, M.
Adiguzel, A.
Adye, T.
Affolder, A. A.
Afik, Y.
Agheorghiesei, C.
Aguilar-Saavedra, J. A.
Ahmadov, F.
Aielli, G.
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Alexa, C.
Alexopoulos, T.
Alhroob, M.
Ali, B.
Alimonti, G.
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EUROPEAN PHYSICAL JOURNAL C, 2019, 79 (01):
[38] Measurement of the W boson polarisation in t(t)over-barevents from pp collisions at √s=8 TeV in the lepton plus jets channel with ATLAS
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Aad, G.
Abbott, B.
Abdallah, J.
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Aguilar-Saavedra, J. A.
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Ahmadov, F.
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Akesson, T. P. A.
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Alison, J.
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EUROPEAN PHYSICAL JOURNAL C, 2017, 77 (04):
[39] Search for exotic decays of the Higgs boson into b(b)over-bar and missing transverse momentum in pp collisions at √s=13 TeV with the ATLAS detector
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Abbott, B.
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Abud, A. Abed
Abeling, K.
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Abulaiti, Y.
Abusleme Hoffman, A. C.
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Agarwala, J.
Aggarwal, A.
Agheorghiesei, C.
Aguilar-Saavedra, J. A.
Ahmad, A.
Ahmadov, F.
Ahmed, W. S.
Ai, X.
Aielli, G.
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Akbiyik, M.
Akesson, T. P. A.
Akimov, A., V
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Alberghi, G. L.
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JOURNAL OF HIGH ENERGY PHYSICS, 2022, (01):
[40] Measurements of Higgs boson production by gluon-gluon fusion and vector-boson fusion using H ? WW* ? e?μ? decays in pp collisions at p s=13 TeV with the ATLAS detector ffi
Aad, G.
Abbott, B.
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Abulaiti, Y.
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Acharya, B. S.
Achkar, B.
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Bourdarios, C. Adam
Adamczyk, L.
Adamek, L.
Addepalli, S. V.
Adelman, J.
Adiguzel, A.
Adorni, S.
Adye, T.
Affolder, A. A.
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Agaras, M. N.
Agarwala, J.
Aggarwal, A.
Agheorghiesei, C.
Aguilar-Saavedra, J. A.
Ahmad, A.
Ahmadov, F.
Ahmed, W. S.
Ai, X.
Aielli, G.
Aizenberg, I.
Akbiyik, M.
Akesson, T. P. A.
Akimov, A. V.
Al Khoury, K.
Alberghi, G. L.
Albert, J.
Albicocco, P.
Alconada Verzini, M. J.
Alderweireldt, S.
Aleksa, M.
Aleksandrov, I. N.
Alexa, C.
Alexopoulos, T.
Alfonsi, A.
Alfonsi, F.
PHYSICAL REVIEW D, 2023, 108 (03)

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