Analysis of the Wtb vertex from the measurement of triple-differential angular decay rates of single top quarks produced in the t-channel at √s=8 TeV with the ATLAS detector

被引：0

作者：

Aaboud, M. ^{[193
,194
]}

Aad, G. ^{[126
,127
]}

Abbott, B. ^{[158
]}

Abdallah, J. ^{[11
]}

Abdinov, O. ^{[15
]}

Abeloos, B. ^{[162
]}

Abidi, S. H. ^{[225
]}

AbouZeid, O. S. ^{[197
]}

Abraham, N. L. ^{[214
]}

Abramowicz, H. ^{[218
]}

Abreu, H. ^{[217
]}

Abreu, R. ^{[161
]}

Abulaiti, Y. ^{[209
,210
]}

Acharya, B. S. ^{[234
,235
,252
]}

Adachi, S. ^{[220
,221
]}

Adamczyk, L. ^{[65
]}

Adelman, J. ^{[153
]}

Adersberger, M. ^{[142
]}

Adye, T. ^{[184
]}

Affolder, A. A. ^{[197
]}

Agatonovic-Jovin, T. ^{[17
]}

Agheorghiesei, C. ^{[41
]}

Aguilar-Saavedra, J. A. ^{[173
,178
,179
]}

Ahlen, S. P. ^{[33
]}

Ahmadov, F. ^{[100
,253
]}

Aielli, G. ^{[187
,188
]}

Akatsuka, S. ^{[103
]}

Akerstedt, H. ^{[209
,210
]}

Akesson, T. P. A. ^{[122
]}

Akilli, E. ^{[78
]}

Akimov, A. V. ^{[138
]}

Alberghi, G. L. ^{[30
,31
]}

Albert, J. ^{[241
]}

Albicocco, P. ^{[76
]}

Verzini, M. J. Alconada ^{[107
,108
]}

Aleksa, M. ^{[48
]}

Aleksandrov, I. N. ^{[100
]}

Alexa, C. ^{[41
]}

Alexander, G. ^{[218
]}

Alexopoulos, T. ^{[13
]}

Alhroob, M. ^{[158
]}

Ali, B. ^{[181
]}

Aliev, M. ^{[110
,111
]}

Alimonti, G. ^{[133
]}

Alison, J. ^{[49
]}

Alkire, S. P. ^{[61
]}

Allbrooke, B. M. M. ^{[214
]}

Allen, B. W. ^{[161
]}

Allport, P. P. ^{[24
]}

Aloisio, A. ^{[11
,110
,133
,147
,148
,167
,210
,234
]}

机构：

[1] Univ Adelaide, Dept Phys, Adelaide, SA, Australia

[2] SUNY Albany, Phys Dept, Albany, NY USA

[3] Univ Alberta, Dept Phys, Edmonton, AB, Canada

[4] Ankara Univ, Dept Phys, Ankara, Turkey

[5] Istanbul Aydin Univ, Istanbul, Turkey

[6] TOBB Univ Econ & Technol, Div Phys, Ankara, Turkey

[7] CNRS, IN2P3, LAPP, Annecy Le Vieux, France

[8] Univ Savoie Mt Blanc, Annecy Le Vieux, France

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

[10] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA

[11] Univ Texas Arlington, Dept Phys, POB 19059, Arlington, TX 76019 USA

[12] Natl & Kapodistrian Univ Athens, Phys Dept, Athens, Greece

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

[14] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

[15] Azerbaijan Acad Sci, Inst Phys, Baku, Azerbaijan

[16] Barcelona Inst Sci & Technol, IFAE, Barcelona, Spain

[17] Univ Belgrade, Inst Phys, Belgrade, Serbia

[18] Univ Bergen, Dept Phys & Technol, Bergen, Norway

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

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

[21] Humboldt Univ, Dept Phys, Berlin, Germany

[22] Albert Einstein Ctr Fundamental Phys, Bern, Switzerland

[23] Univ Bern, Lab High Energy Phys, Bern, Switzerland

[24] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England

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

[26] Gaziantep Univ, Dept Phys Engn, Gaziantep, Turkey

[27] Istanbul Bilgi Univ, Fac Engn & Nat Sci, Istanbul, Turkey

[28] Bahcesehir Univ, Fac Engn & Nat Sci, Istanbul, Turkey

[29] Univ Antonio Narino, Ctr Invest, Bogota, Colombia

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

[31] Univ Bologna, Dipartimento Fis & Astron, Bologna, Italy

[32] Univ Bonn, Phys Inst, Bonn, Germany

[33] Boston Univ, Dept Phys, 590 Commonwealth Ave, Boston, MA 02215 USA

[34] Brandeis Univ, Dept Phys, Waltham, MA 02254 USA

[35] Univ Fed Rio de Janeiro COPPE EE IF, Rio De Janeiro, Brazil

[36] Fed Univ Juiz de Fora UFJF, Elect Circuits Dept, Juiz De Fora, Brazil

[37] Univ Fed Sao Joao del Rei, Sao Joao Del Rei, Brazil

[38] Univ Sao Paulo, Inst Fis, Sao Paulo, Brazil

[39] Brookhaven Natl Lab, Phys Dept, Upton, NY 11973 USA

[40] Transilvania Univ Brasov, Brasov, Romania

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

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

[43] Natl Inst Res & Dev Isotop & Mol Technol, Dept Phys, Cluj Napoca, Romania

[44] West Univ Timisoara, Timisoara, Romania

[45] Univ Buenos Aires, Dept Fis, Buenos Aires, DF, Argentina

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

[47] Carleton Univ, Dept Phys, Ottawa, ON, Canada

[48] CERN, Geneva, Switzerland

[49] Univ Chicago, Enrico Fermi Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA

[50] Pontificia Univ Catolica Chile, Dept Fis, Santiago, Chile

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2017年 / 12期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会; 巴西圣保罗研究基金会;

关键词：

Electroweak interaction; Hadron-Hadron scattering (experiments); Top physics; PARTON DISTRIBUTIONS; HADRON COLLIDERS; PAIR PRODUCTION; MONTE-CARLO; POLARIZATION; LHC; QCD;

D O I：

10.1007/JHEP12(2017)017

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The electroweak production and subsequent decay of single top quarks in the t-channel is determined by the properties of the Wtb vertex, which can be described by the complex parameters of an effective Lagrangian. An analysis of a triple-differential decay rate in t-channel production is used to simultaneously determine five generalised helicity fractions and phases, as well as the polarisation of the produced top quark. The complex parameters are then constrained. This analysis is based on 20.2 fb(-1) of proton-proton collision data at a centre-of-mass energy of 8 TeV collected with the ATLAS detector at the LHC. The fraction of decays containing transversely polarised W bosons is measured to be f(1) = 0.30 +/- 0.05. The phase between amplitudes for transversely and longitudinally polarised W bosons recoiling against left-handed b-quarks is measured to be delta = 0.002 pi(+0.016 pi)(+0.017 pi), giving no indication of CP violation. The fractions of longitudinal or transverse W bosons accompanied by right-handed b-quarks are also constrained. Based on these measurements, limits are placed at 95% CL on the ratio of the complex coupling parameters Re [g(R)/V-L is an element of [-0.12, 0.17] and Im [g(R)/V-L is an element of [-0.07, 0.06]. Constraints are also placed on the ratios vertical bar V-R/V-L vertical bar and vertical bar g(L)/V-L vertical bar. In addition, the polarisation of single top quarks in the t-channel is constrained to be P > 0.72 (95% CL). None of the above measurements make assumptions about the value of any of the other parameters or couplings and all of them are in agreement with the Standard Model.

引用

页数：60

共 108 条

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