Abstract
Pair production of tau leptons in two photon collision γγ → τ + τ − is studied at CLIC to test CP violating QED couplings of tau leptons. CP violating effects are investigated using tau pair spin correlations which are observed through the hadronic decay of each τ into πν. Competitive bounds with previous works on the electric dipole moment from CP odd terms have been obtained.
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References
M. Kobayashi and T. Maskawa, CP Violation in the Renormalizable Theory of Weak Interaction, Prog. Theor. Phys. 49 (1973) 652 [INSPIRE].
F. Hoogeveen, The Standard Model Prediction for the Electric Dipole Moment of the Electron, Nucl. Phys. B 341 (1990) 322 [INSPIRE].
S. Weinberg, Gauge Theory of CP-violation, Phys. Rev. Lett. 37 (1976) 657 [INSPIRE].
S.M. Barr and A. Zee, Electric Dipole Moment of the Electron and of the Neutron, Phys. Rev. Lett. 65 (1990) 21 [Erratum ibid. 65 (1990) 2920] [INSPIRE].
S.M. Barr and W.J. Marciano, Electric Dipole Moments, in CP Violation, C. Jarlskog ed., World Scientific, Singapore (1989), pg. 455.
J.R. Ellis, S. Ferrara and D.V. Nanopoulos, CP Violation and Supersymmetry, Phys. Lett. B 114 (1982) 231 [INSPIRE].
J.C. Pati and A. Salam, Lepton Number as the Fourth Color, Phys. Rev. D 10 (1974) 275 [Erratum ibid. D 11 (1975) 703] [INSPIRE].
J.P. Ma and A. Brandenburg, CP violation and top quark decays, Z. Phys. C 56 (1992) 97 [INSPIRE].
S.M. Barr, A Survey of a New Class of Models of CP Violation, Phys. Rev. D 34 (1986) 1567 [INSPIRE].
W. Grimus, CP Violating Phenomena and Theoretical Results, Fortsch. Phys. 36 (1988) 201 [INSPIRE].
W. Bernreuther and O. Nachtmann, Some remarks on the search for CP-violation in Z decays, Z. Phys. C 73 (1997) 647 [hep-ph/9603331] [INSPIRE].
L3 collaboration, M. Acciarri et al., Measurement of the anomalous magnetic and electric dipole moments of the tau lepton, Phys. Lett. B 434 (1998) 169 [INSPIRE].
OPAL collaboration, K. Ackerstaff et al., An Upper limit on the anomalous magnetic moment of the tau lepton, Phys. Lett. B 431 (1998) 188 [hep-ex/9803020] [INSPIRE].
DELPHI collaboration, J. Abdallah et al., Study of tau-pair production in photon-photon collisions at LEP and limits on the anomalous electromagnetic moments of the tau lepton, Eur. Phys. J. C 35 (2004) 159 [hep-ex/0406010] [INSPIRE].
Belle collaboration, K. Inami et al., Search for the electric dipole moment of the tau lepton, Phys. Lett. B 551 (2003) 16 [hep-ex/0210066] [INSPIRE].
J. Bernabeu, G.A. Gonzalez-Sprinberg and J. Vidal, CP violation and electric-dipole-moment at low energy tau-pair production, Nucl. Phys. B 701 (2004) 87 [hep-ph/0404185] [INSPIRE].
Y.-S. Tsai, Decay Correlations of Heavy Leptons in e + e − → l + l −, Phys. Rev. D 4 (1971) 2821 [Erratum ibid. D 13 (1976) 771] [INSPIRE].
V.M. Budnev, I.F. Ginzburg, G.V. Meledin and V.G. Serbo, The two photon particle production mechanism. Physical problems. Applications. Equivalent photon approximation, Phys. Rept. 15 (1975) 181 [INSPIRE].
CLIC Study Team collaboration, H. Braun et al., CLIC 2008 parameters, CLIC-NOTE-764, http://www.clic-study.org.
D. Dannheim et al., CLIC e + e − Linear Collider Studies, arXiv:1208.1402 [INSPIRE].
P. Lebrun et al., The CLIC Programme: Towards a Staged e + e − Linear Collider Exploring the Terascale: CLIC Conceptual Design Report, arXiv:1209.2543 [INSPIRE].
A. Pukhov et al., CompHEP: A package for evaluation of Feynman diagrams and integration over multiparticle phase space, hep-ph/9908288 [INSPIRE].
A. Pukhov, CalcHEP 2.3: MSSM, structure functions, event generation, batchs and generation of matrix elements for other packages, hep-ph/0412191 [INSPIRE].
A.A. Billur and M. Koksal, Probe of the electromagnetic moments of the tau lepton in gamma-gamma collisions at the CLIC, Phys. Rev. D 89 (2014) 037301 [arXiv:1306.5620] [INSPIRE].
A. Stahl, Physics with Tau Leptons, Springer (2000).
ALEPH collaboration, A. Heister et al., Measurement of the tau polarization at LEP, Eur. Phys. J. C 20 (2001) 401 [hep-ex/0104038] [INSPIRE].
Belle collaboration, K. Belous et al., Measurement of the τ -lepton lifetime at Belle, Phys. Rev. Lett. 112 (2014) 031801 [arXiv:1310.8503] [INSPIRE].
D. Jeans, Tau lepton reconstruction at collider experiments using impact parameters, Nucl. Instrum. Meth. A 810 (2016) 51 [arXiv:1507.01700] [INSPIRE].
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ArXiv ePrint: 1512.03640
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Atağ, S., Gürkanlı, E. Prediction for CP violation via electric dipole moment of τ lepton in γγ → τ + τ − process at CLIC. J. High Energ. Phys. 2016, 118 (2016). https://doi.org/10.1007/JHEP06(2016)118
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DOI: https://doi.org/10.1007/JHEP06(2016)118