Measurement of τ polarisation in Z/γ* → ττ decays in proton-proton collisions at √s=8 TeV with the ATLAS detector

被引：0

作者：

Aaboudd, M. ^{[192
]}

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

Abbott, B. ^{[157
]}

Abdinov, O. ^{[16
]}

Abeloos, B. ^{[161
]}

Abidi, S. H. ^{[224
]}

AbouZeid, O. S. ^{[195
]}

Abraham, N. L. ^{[213
]}

Abrainowicz, H. ^{[217
]}

Abreu, H. ^{[216
]}

Abreu, R. ^{[160
]}

Abulaiti, Y. ^{[207
,208
]}

Acharya, B. S. ^{[233
,234
,251
]}

Adachi, S. ^{[219
,220
]}

Adamczykh, L. ^{[65
]}

Adelmanlm, J. ^{[153
]}

Adersberger, M. ^{[142
]}

Adye, T. ^{[182
]}

Affolder, A. A. ^{[195
]}

Afik, Y. ^{[216
]}

Agatonovic-Jovin, T. ^{[18
]}

Agheorghiesei, C. ^{[42
,44
]}

Aguilar-Saavedra, J. A. ^{[172
,177
]}

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

Ahmadov, F. ^{[16
,100
]}

Aielli, G. ^{[185
,186
]}

Akatsuka, S. ^{[103
]}

Akerstedt, H. ^{[207
,208
]}

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

Akilli, E. ^{[79
]}

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

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

Albert, J. ^{[240
]}

Albicocco, P. ^{[76
,77
]}

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

Alderweireldt, S. C. ^{[150
]}

Aleksa, M. ^{[49
]}

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

Alexa, C. ^{[41
]}

Alexander, G. ^{[217
]}

Alexopoulos, T. ^{[14
]}

Alhroob, M. ^{[157
]}

Ali, B. ^{[179
]}

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

Alimonti, G. ^{[133
]}

Alison, J. ^{[50
]}

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

Allbrooke, B. M. M. ^{[213
]}

Allen, B. W. ^{[160
]}

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

机构：

[1] CERN, CH-121123 Geneva, Switzerland

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

[3] SUNY Albany, Dept Phys, Albany, NY 12222 USA

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

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

[6] Istanbul Aydin Univ, Istanbul, Turkey

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[23] Univ Bern, Albert Einstein Ctr Fundamental Phys, 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, Physikal 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] Fed Univ Sao Joao Del Rei UFSJ, Sao Joao Del Rei, Brazil

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

[39] Brookhaven Natl Lab, Dept Phys, 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, Phys Dept, Cluj Napoca, Romania

[44] Univ Politeh Bucharest, Bucharest, Romania

[45] West Univ Timisoara, Timisoara, Romania

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

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

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

[49] CERN, Geneva, Switzerland

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

来源：

EUROPEAN PHYSICAL JOURNAL C | 2018年 / 78卷 / 02期

基金：

美国国家科学基金会; 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：

MONTE-CARLO; PP COLLISIONS; SIMULATION;

D O I：

10.1140/epjc/s10052-018-5619-1

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：

This paper presents a measurement of the polarisation of tau leptons produced in Z/gamma* -> tau tau decays which is performed with a dataset of proton-proton collisions at root s = 8 TeV, corresponding to an integrated luminosity of 20.2 fb(-1) recorded with the ATLAS detector at the LHC in 2012. The Z/gamma* -> tau tau decays are reconstructed from a hadronically decaying tau lepton with a single charged particle in the final state, accompanied by a tau lepton that decays leptonically. The tau polarisation is inferred from the relative fraction of energy carried by charged and neutral hadrons in the hadronic tau decays. The polarisation is measured in a fiducial region that corresponds to the kinematic region accessible to this analysis. The tau polarisation extracted over the full phase space within the Z/gamma* mass range of 66 < mZ/gamma* < 116GeVis found to be P-tau = -0.14 +/- 0.02(stat)+/- 0.04(syst). It is in agreement with the Standard Model prediction of Pt = -0.1517 +/- 0.0019, which is obtained from the ALP-GEN event generator interfaced with the PYTHIA 6 parton shower modelling and the TAUOLA tau decay library.

引用

页数：30