A bound on Planck-scale deformations of CPT from muon lifetime

We show that deformed relativistic kinematics, expected to emerge in a flat-spacetime limit of quantum gravity, predicts different lifetimes for particles and their antiparticles. This phenomenon is a consequence of Planck-scale modifications of the action of discrete symmetries. In particular we fo...

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Bibliographic Details
Published inPhysics letters. B Vol. 794; pp. 41 - 44
Main Authors Arzano, Michele, Kowalski-Glikman, Jerzy, Wiślicki, Wojciech
Format Journal Article
LanguageEnglish
Published Elsevier B.V 10.07.2019
Elsevier
Subjects
CPT symmetry
Particle lifetime
Quantum gravity
κ-deformation
Particle lifetime
CPT symmetry
Quantum gravity
κ-deformation
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Summary:We show that deformed relativistic kinematics, expected to emerge in a flat-spacetime limit of quantum gravity, predicts different lifetimes for particles and their antiparticles. This phenomenon is a consequence of Planck-scale modifications of the action of discrete symmetries. In particular we focus on deformations of the action of CPT derived from the κ-Poincaré algebra, the most studied example of Planck-scale deformation of relativistic symmetries. Looking at lifetimes of muons and anti-muons we are able to derive an experimental bound on the deformation parameter of κ≳4×1014 GeV from measurements at the LHC. Such bound has the potential to reach the value of κ≳2×1016 GeV using measurements at the planned Future Circular Collider (FCC).
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2019.05.025