28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

Can we constrain anomalous magnetic and/or electric dipole moments of tau lepton from $Pb Pb \to Pb Pb \tau^+ \tau^-$ reaction at the LHC ?

30 Jul 2020, 13:36
3m
virtual conference

virtual conference

Poster 07. Heavy Ions Heavy Ions - Posters

Speakers

Mariola Kłusek-Gawenda (IFJ PAS) Antoni Szczurek (Institute of Nuclear Physics) Mateusz Dyndal (CERN) Matthias Schott (CERN / University of Mainz)

Description

We will discuss the sensitivity of the $\gamma \gamma \to \tau^+ \tau^-$ process in ultraperipheral Pb+Pb collisions on the anomalous magnetic moment of $\tau$ lepton ($a_{\tau}$) at LHC energies. We derive the corresponding cross sections by folding the elementary cross section with the heavy-ion photon fluxes and considering semi-leptonic decays of both $\tau$ leptons in the fiducial volume of ATLAS and CMS detectors. We present predictions for total and differential cross sections, and for the ratios to $\gamma \gamma \to e^+ e^- (\mu^+ \mu^-$) process. These ratios allow to cancel theoretical and experimental uncertainties when performing precision measurement of $a_{\tau}$ at the LHC. The expected limits on $a_{\tau}$ with existing Pb+Pb dataset are found to be better by a factor of two comparing to the current best experimental limits and can be further improved by another factor of two at High Luminosity LHC. In addition, our results for tau lepton electric dipole moment, $d_{\tau}$, can be competitive with the current best limits that were measured by Belle experiment.

Secondary track (number) 07

Primary authors

Mariola Kłusek-Gawenda (IFJ PAS) Antoni Szczurek (Institute of Nuclear Physics) Mateusz Dyndal (CERN) Matthias Schott (CERN / University of Mainz)

Presentation Materials