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Production and decay rates of excited leptons in a left-right symmetric scenario

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Title Production and decay rates of excited leptons in a left-right symmetric scenario
 
Creator BANERJEE, P
YAJNIK, UA
 
Subject ANOMALOUS MAGNETIC-MOMENT
MODEL
QUARKS
COMPOSITENESS
SUBSTRUCTURE
OSCILLATIONS
COLLIDERS
ELECTRONS
LIMITS
TESTS
 
Description We merge two leading beyond standard model scenarios, namely compositeness and left-right symmetry, and probe the resulting collider signatures in the leptonic case. The constraints on composite models for fermions leave open the possibility of vectorlike excitations of standard model fermions. Here we consider the possibility of low scale left-right gauge symmetry SU(2)(R) x SU(2)(L) x U(1)(B-L), with the simplifying assumption that the rightlike excited sector of fermions is significantly heavier than the excitations of the left chiral fermions. It is found that the right-hand currents still contribute to observable processes, and alter the existing bounds on the scale of compositeness. The cross section times branching ratio of the photon decay channel is strongly depressed, bringing down the exclusion limit of the mass of excited electrons from about 2 TeV to below 1 TeV. On the other hand, cross section times branching ratio of the Z decay channel is significantly enhanced and remains greater than that of the photon channel. We thus propose analyzing the Z decay channel in existing collider data in order to search for signature of left-right symmetry as well as excited leptons with masses above 1 TeV.
 
Publisher AMER PHYSICAL SOC
 
Date 2014-12-28T14:05:47Z
2014-12-28T14:05:47Z
2014
 
Type Article
 
Identifier PHYSICAL REVIEW D, 90(9)
1550-7998
1550-2368
http://dx.doi.org/10.1103/PhysRevD.90.095023
http://dspace.library.iitb.ac.in/jspui/handle/100/16708
 
Language English