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Title: CP violation in h → ττ and LFV h → μτ

Abstract

The CMS Collaboration has reported a possible lepton flavor violating (LFV) signal . Whereas this does not happen in the standard model (SM), we point out that new physics responsible for this type of decay would, in general, also produce charge-parity (CP) violation in . We estimate the size of this effect in a model independent manner and find that a large asymmetry, of order 25%, is allowed by current constraints.

Authors:
 [1];  [2];  [3]
  1. Ozyegin Univ., Istanbul (Turkey)
  2. National Center for Theoretical Sciences, Hsinchu (Taiwan); Shanghai Jiao Tong Univ. (China); National Taiwan Univ., Taipei (Taiwan)
  3. Monash Univ., Melbourne, VIC (Australia)
Publication Date:
Research Org.:
Iowa State Univ., Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1260056
Alternate Identifier(s):
OSTI ID: 1434614
Grant/Contract Number:
SC0009974; 102R891505
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 760; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Hayreter, Alper, He, Xiao-Gang, and Valencia, German. CP violation in h → ττ and LFV h → μτ. United States: N. p., 2016. Web. doi:10.1016/j.physletb.2016.06.066.
Hayreter, Alper, He, Xiao-Gang, & Valencia, German. CP violation in h → ττ and LFV h → μτ. United States. doi:10.1016/j.physletb.2016.06.066.
Hayreter, Alper, He, Xiao-Gang, and Valencia, German. Thu . "CP violation in h → ττ and LFV h → μτ". United States. doi:10.1016/j.physletb.2016.06.066.
@article{osti_1260056,
title = {CP violation in h → ττ and LFV h → μτ},
author = {Hayreter, Alper and He, Xiao-Gang and Valencia, German},
abstractNote = {The CMS Collaboration has reported a possible lepton flavor violating (LFV) signal . Whereas this does not happen in the standard model (SM), we point out that new physics responsible for this type of decay would, in general, also produce charge-parity (CP) violation in . We estimate the size of this effect in a model independent manner and find that a large asymmetry, of order 25%, is allowed by current constraints.},
doi = {10.1016/j.physletb.2016.06.066},
journal = {Physics Letters. Section B},
number = C,
volume = 760,
place = {United States},
year = {Thu Jun 30 00:00:00 EDT 2016},
month = {Thu Jun 30 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physletb.2016.06.066

Citation Metrics:
Cited by: 7works
Citation information provided by
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  • The CMS Collaboration has reported a possible lepton flavor violating (LFV) signal . Whereas this does not happen in the standard model (SM), we point out that new physics responsible for this type of decay would, in general, also produce charge-parity (CP) violation in . We estimate the size of this effect in a model independent manner and find that a large asymmetry, of order 25%, is allowed by current constraints.
  • The results of searches for Lepton Flavour Violating (LFV) decays at the BaBar detector located on the PEP-II collider, using data collected at an e{sup +}e{sup -} energy of 10.58 GeV, are presented. Upper limits at 90% Confidence Level (CL) are established in the range 1-3 x 10{sup -7} for six {tau} {yields} lll modes using 91.5 fb{sup -1} of data and in the range 0.7-4.8 x 10{sup -7} for fourteen {tau} {yields} lhh modes using 221.4 fb{sup -1} of data. The {tau} {yields} lhh results are preliminary.
  • We report a measurement of the time-dependent CP asymmetry of B¯ 0 → D (*) CPh 0 decays, where the light neutral hadron h 0 is a π 0, η, or ω meson, and the neutral D meson is reconstructed in the CP eigenstates K +K , K 0 Sπ 0, or K 0 Sω. The measurement is performed combining the final data samples collected at the Υ(4S) resonance by the BABAR and Belle experiments at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×10 6 BB¯ pairs recorded by the BABARmore » detector and (772±11)×10 6 BB¯ pairs recorded by the Belle detector. We measure the CP asymmetry parameters –ηfS=+0.66±0.10(stat)±0.06(syst) and C=–0.02±0.07(stat)±0.03(syst). These results correspond to the first observation of CP violation in B¯ 0 → D (*) CPh 0 decays. As a result, the hypothesis of no mixing-induced CP violation is excluded in these decays at the level of 5.4 standard deviations.« less
  • A direct search for lepton-flavour-violating H → μτ decays of the recently discovered Higgs boson with the ATLAS detector at the LHC is presented. The analysis is performed in the H → μτ had channel, where τhad is a hadronically decaying τ -lepton. The search is based on the data sample of proton-proton collisions collected by the ATLAS experiment corresponding to an integrated luminosity of 20.3 fb -1 at a centre-of-mass energy of √s=8 TeV. No statistically significant excess of data over the predicted background is observed. The observed (expected) 95% confidence-level upper limit on the branching fraction, Br(H →more » μτ ), is 1.85% (1.24%).« less