Abstract
In this paper we discuss the possibility of measuring the anomalous magnetic and electric dipole moments of the τ lepton. The method consists in studying the spin precession induced by the strong effective magnetic field inside channels of a bent crystal with a dedicated setup at the CERN Large Hadron Collider.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Particle Data Group collaboration, Review of Particle Physics, Phys. Rev. D 98 (2018) 030001 [INSPIRE].
Muon g-2 collaboration, Final Report of the Muon E821 Anomalous Magnetic Moment Measurement at BNL, Phys. Rev. D 73 (2006) 072003 [hep-ex/0602035] [INSPIRE].
M. Knecht, The Anomalous magnetic moment of the muon: A Theoretical introduction, Lect. Notes Phys. 629 (2004) 37 [hep-ph/0307239] [INSPIRE].
M. Passera, The Standard model prediction of the muon anomalous magnetic moment, J. Phys. G 31 (2005) R75 [hep-ph/0411168] [INSPIRE].
F. Jegerlehner and A. Nyffeler, The Muon g − 2, Phys. Rept. 477 (2009) 1 [arXiv:0902.3360] [INSPIRE].
S. Eidelman and M. Passera, Theory of the τ lepton anomalous magnetic moment, Mod. Phys. Lett. A 22 (2007) 159 [hep-ph/0701260] [INSPIRE].
DELPHI collaboration, 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].
F. Cornet and J.I. Illana, τ -pair production via photon-photon collisions at the CERN e + e − collider LEP, Phys. Rev. D 53 (1996) 1181 [hep-ph/9503466] [INSPIRE].
G.A. Gonzalez-Sprinberg, A. Santamaria and J. Vidal, Model independent bounds on the tau lepton electromagnetic and weak magnetic moments, Nucl. Phys. B 582 (2000) 3 [hep-ph/0002203] [INSPIRE].
B.L. Roberts, Historical Introduction to Electric and Magnetic Moments, Adv. Ser. Direct. High Energy Phys. 20 (2009) 1 [INSPIRE].
E.D. Commins, Electric dipole moments of leptons, Adv. At. Mol. Opt. Phys. 40 (1999) 1 [INSPIRE].
E.D. Commins and D. DeMille, The electric dipole moment of the electron, Adv. Ser. Direct. High Energy Phys. 20 (2009) 519 [INSPIRE].
Belle collaboration, Search for the electric dipole moment of the τ lepton, Phys. Lett. B 551 (2003) 16 [hep-ex/0210066] [INSPIRE].
A. Hayreter and G. Valencia, Constraints on anomalous color dipole operators from Higgs boson production at the LHC, Phys. Rev. D 88 (2013) 034033 [arXiv:1304.6976] [INSPIRE].
A. Hayreter and G. Valencia, Spin correlations and new physics in τ -lepton decays at the LHC, JHEP 07 (2015) 174 [arXiv:1505.02176] [INSPIRE].
S. Atag and A.A. Billur, Possibility of Determining τ Lepton Electromagnetic Moments in γγ → τ + τ − Process at the CERN-LHC, JHEP 11 (2010) 060 [arXiv:1005.2841] [INSPIRE].
M. Köksal, S.C. İnan, A.A. Billur, Y. Özgüven and M.K. Bahar, Analysis of the anomalous electromagnetic moments of the tau lepton in γp collisions at the LHC, Phys. Lett. B 783 (2018) 375 [arXiv:1711.02405] [INSPIRE].
M. Köksal, A.A. Billur, A. Gutiérrez-Rodr ıguez and M.A. Hernández-Ruíz, Model-independent sensitivity estimates for the electromagnetic dipole moments of the τ -lepton at the CLIC, Phys. Rev. D 98 (2018) 015017 [arXiv:1804.02373] [INSPIRE].
Y. Özgüven, S.C. İnan, A.A. Billur, M. Köksal and M.K. Bahar, Search for the anomalous electromagnetic moments of tau lepton through electron-photon scattering at CLIC, Nucl. Phys. B 923 (2017) 475 [arXiv:1609.08348] [INSPIRE].
M. Köksal, Search for the electromagnetic moments of the τ lepton in photon-photon collisions at the LHeC and the FCC-he, arXiv:1809.01963 [INSPIRE].
J. Bernabeu, G.A. Gonzalez-Sprinberg, J. Papavassiliou and J. Vidal, Tau anomalous magnetic moment form-factor at super B/flavor factories, Nucl. Phys. B 790 (2008) 160 [arXiv:0707.2496] [INSPIRE].
J. Bernabeu, G.A. Gonzalez-Sprinberg and J. Vidal, Tau spin correlations and the anomalous magnetic moment, JHEP 01 (2009) 062 [arXiv:0807.2366] [INSPIRE].
S. Eidelman, D. Epifanov, M. Fael, L. Mercolli and M. Passera, τ dipole moments via radiative leptonic τ decays, JHEP 03 (2016) 140 [arXiv:1601.07987] [INSPIRE].
M. Fael and M. Passera, Precision tests via radiative μ and τ leptonic decays, PoS(RADCOR2015)091 (2016) [arXiv:1602.00457] [INSPIRE].
M.A. Samuel, G.-w. Li and R. Mendel, The Anomalous magnetic moment of the τ lepton, Phys. Rev. Lett. 67 (1991) 668 [Erratum ibid. 69 (1992) 995] [INSPIRE].
E761 collaboration, First observation of magnetic moment precession of channeled particles in bent crystals, Phys. Rev. Lett. 69 (1992) 3286 [INSPIRE].
V.G. Baryshevsky, The possibility to measure the magnetic moments of short-lived particles (charm and beauty baryons) at LHC and FCC energies using the phenomenon of spin rotation in crystals, Phys. Lett. B 757 (2016) 426 [INSPIRE].
A.S. Fomin et al., Feasibility of measuring the magnetic dipole moments of the charm baryons at the LHC using bent crystals, JHEP 08 (2017) 120 [arXiv:1705.03382] [INSPIRE].
F.J. Botella et al., On the search for the electric dipole moment of strange and charm baryons at LHC, Eur. Phys. J. C 77 (2017) 181 [arXiv:1612.06769] [INSPIRE].
E. Bagli et al., Electromagnetic dipole moments of charged baryons with bent crystals at the LHC, Eur. Phys. J. C 77 (2017) 828 [arXiv:1708.08483] [INSPIRE].
V.G. Baryshevsky, Spin rotation and depolarization of high-energy particles in crystals at LHC and FCC energies. The possibility to measure the anomalous magnetic moments of short-lived particles and quadrupole moment of Ω-hyperon, Nucl. Instrum. Meth. B 402 (2017) 5 [INSPIRE].
A. Fomin, Multiple scattering effects on the dynamics and radiation of fast charged particles in crystals. Transients in the nuclear burning wave reactor, Ph.D. Thesis, PHENIICS, Paris-Sud University, Orsay France (2017).
M. Davier, L. Duflot, F. Le Diberder and A. Rouge, The Optimal method for the measurement of tau polarization, Phys. Lett. B 306 (1993) 411 [INSPIRE].
K. Hagiwara, A.D. Martin and D. Zeppenfeld, τ polarization measurements at LEP and SLC, Phys. Lett. B 235 (1990) 198 [INSPIRE].
A. Rouge, Polarization observables in the 3πν decay mode of the τ, Z. Phys. C 48 (1990) 75 [INSPIRE].
L. Duflot, Nouvelle méthode de mesure de la polarisation du τ, Application au canal τ →a 1ντ dans l’expérience ALEPH,Ph.D.Thesis,Laboratoiredel’accélérateurlinéaire, Orsay France (1993).
V.G. Baryshevsky, Spin rotation of ultrarelativistic particles passing through a crystal, Sov. Tech. Phys. Lett. 5 (1979) 73 [Pis’ma. Zh. Tekh. Fiz. 5 (1979) 182].
V.L. Lyuboshits, The Spin Rotation at Deflection of Relativistic Charged Particle in Electric Field, Sov. J. Nucl. Phys. 31 (1980) 509 [Yad. Fiz. 31 (1980) 986] [INSPIRE].
I.J. Kim, Magnetic Moment Measurement of Baryons With Heavy Flavored Quarks by Planar Channeling Through Bent Crystal, Nucl. Phys. B 229 (1983) 251 [INSPIRE].
T. Sjöstrand, S. Mrenna and P.Z. Skands, A Brief Introduction to PYTHIA 8.1, Comput. Phys. Commun. 178 (2008) 852 [arXiv:0710.3820] [INSPIRE].
V.B. Beresteckii, E.M. Lifshitz and L.P. Pitaevskii, Quantum electrodynamics, Pergamon Press (1982).
Open Access
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1810.06699
Rights and permissions
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.
The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/.
About this article
Cite this article
Fomin, A.S., Korchin, A.Y., Stocchi, A. et al. Feasibility of τ -lepton electromagnetic dipole moments measurement using bent crystal at the LHC. J. High Energ. Phys. 2019, 156 (2019). https://doi.org/10.1007/JHEP03(2019)156
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP03(2019)156