Top quark spin correlations and polarization at the LHC: Standard model predictions and effects of anomalous top chromo moments

被引：59

作者：

Bernreuther, Werner ^{[1
]}

Si, Zong-Guo ^{[2
]}

机构：

[1] Rhein Westfal TH Aachen, Inst Theoret Phys, D-52056 Aachen, Germany

[2] Shandong Univ, Dept Phys, Jinan 250100, Shandong, Peoples R China

来源：

PHYSICS LETTERS B | 2013年 / 725卷 / 1-3期

关键词：

Hadron collider physics; Top quark; Spin; New physics; CP violation; PAIR PRODUCTION; CP VIOLATION; DECAY; COUPLINGS; TEVATRON; DISTRIBUTIONS;

D O I：

10.1016/j.physletb.2013.06.051

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A number of top-spin observables are computed within the Standard Model (SM), at next-to-leading order in the strong and weak gauge couplings for hadronic top-quark anti-quark (t (t) over bar) production and decay at the LHC for center-of-mass energies 7 and 8 TeV. For dileptonic final states we consider the azimuthal angle correlation, the helicity correlation, and the opening angle distribution; for lepton plus jets final states we determine distributions and asymmetries that trace a longitudinal and transverse polarization, respectively, of the t and (t) over bar samples. The QCD-induced transverse polarization of the top quarks leads to an asymmetry of about 8% that should be detectable with existing data. In addition, we investigate the effects of a non-zero chromo-magnetic and chromo-electric dipole moment of the top quark on these and other top-spin observables and associated asymmetries. These observables allow to disentangle the contributions from the real and imaginary parts of these moments. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：115 / 122

页数：8

共 58 条

[1] Observation of Spin Correlation in t(t)over-bar Events from pp Collisions at √s=7 TeV Using the ATLAS Detector [J].

Aad, G. ;

Abbott, B. ;

Abdallah, J. ;

Khalek, S. Abdel ;

Abdelalim, A. A. ;

Abdesselam, A. ;

Abdinov, O. ;

Abi, B. ;

Abolins, M. ;

AbouZeid, O. S. ;

Abramowicz, H. ;

Abreu, H. ;

Acerbi, E. ;

Acharya, B. S. ;

Adamczyk, L. ;

Adams, D. L. ;

Addy, T. N. ;

Adelman, J. ;

Aderholz, M. ;

Adomeit, S. ;

Adragna, P. ;

Adye, T. ;

Aefsky, S. ;

Aguilar-Saavedra, J. A. ;

Aharrouche, M. ;

Ahlen, S. P. ;

Ahles, F. ;

Ahmad, A. ;

Ahsan, M. ;

Aielli, G. ;

Akdogan, T. ;

Akesson, T. P. A. ;

Akimoto, G. ;

Akimov, A. V. ;

Akiyama, A. ;

Alam, M. S. ;

Alam, M. A. ;

Albert, J. ;

Albrand, S. ;

Aleksa, M. ;

Aleksandrov, I. N. ;

Alessandria, F. ;

Alexa, C. ;

Alexander, G. ;

Alexandre, G. ;

Alexopoulos, T. ;

Alhroob, M. ;

Aliev, M. ;

Alimonti, G. ;

Alison, J. .

PHYSICAL REVIEW LETTERS, 2012, 108 (21)

[2] Evidence for Spin Correlation in t(t)over-bar Production [J].

Abazov, V. M. ;

Abbott, B. ;

Acharya, B. S. ;

Adams, M. ;

Adams, T. ;

Alexeev, G. D. ;

Alkhazov, G. ;

Alton, A. ;

Alverson, G. ;

Alves, G. A. ;

Aoki, M. ;

Askew, A. ;

Asman, B. ;

Atkins, S. ;

Atramentov, O. ;

Augsten, K. ;

Avila, C. ;

BackusMayes, J. ;

Badaud, F. ;

Bagby, L. ;

Baldin, B. ;

Bandurin, D. V. ;

Banerjee, S. ;

Barberis, E. ;

Baringer, P. ;

Barreto, J. ;

Bartlett, J. F. ;

Bassler, U. ;

Bazterra, V. ;

Bean, A. ;

Begalli, M. ;

Belanger-Champagne, C. ;

Bellantoni, L. ;

Beri, S. B. ;

Bernardi, G. ;

Bernhard, R. ;

Bertram, I. ;

Besancon, M. ;

Beuselinck, R. ;

Bezzubov, V. A. ;

Bhat, P. C. ;

Bhatnagar, V. ;

Blazey, G. ;

Blessing, S. ;

Bloom, K. ;

Boehnlein, A. ;

Boline, D. ;

Boos, E. E. ;

Borissov, G. ;

Bose, T. .

PHYSICAL REVIEW LETTERS, 2012, 108 (03)

[3]

Abazov V.M., ARXIV12070364HEPEX D

[4] Effective four-fermion operators in top physics: A roadmap (vol 843, pg 638, 2011) [J].

Aguilar-Saavedra, J. A. .

NUCLEAR PHYSICS B, 2011, 851 (02) :443-444

[5] A minimal set of top-Higgs anomalous couplings [J].

Aguilar-Saavedra, J. A. .

NUCLEAR PHYSICS B, 2009, 821 (1-2) :215-227

[6] A minimal set of top anomalous couplings [J].

Aguilar-Saavedra, J. A. .

NUCLEAR PHYSICS B, 2009, 812 (1-2) :181-204

[7]

[Anonymous], ARXIVHEPPH9812387

[8] AZIMUTHAL CORRELATION OF CHARGED LEPTONS PRODUCED IN P(P)OVER-BAR-]T(T)OVER-BAR+... [J].

ARENS, T ;

SEHGAL, LM .

PHYSICS LETTERS B, 1993, 302 (04) :501-506

[9]

ATLAS Collaboration, ATLASCONF2012133

[10] CONSTRAINING ANOMALOUS TOP-QUARK COUPLINGS AT THE FERMILAB-TEVATRON [J].

ATWOOD, D ;

KAGAN, A ;

RIZZO, TG .

PHYSICAL REVIEW D, 1995, 52 (11) :6264-6270

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