CP violation in hadronic {tau} decays

Journal Article · Sun Apr 01 04:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.074007· OSTI ID:21020267

Datta, Alakabha ^[1]; Kiers, Ken ^[2]; London, David; Szynkman, Alejandro ^[3]; O'Donnell, Patrick J ^[4]

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1. Dept of Physics and Astronomy, 108 Lewis Hall, University of Mississippi, Oxford, Mississippi 38677-1848 (United States)
2. Physics Department, Taylor University, 236 West Reade Avenue, Upland, Indiana, 46989 (United States)
3. Physique des Particules, Universite de Montreal, C.P. 6128, succursale centre-ville, Montreal, QC, H3C 3J7 (Canada)
4. Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON, M5S 1A7 (Canada)

We reexamine CP violation in the {delta}S=0 decays {tau}{yields}N{pi}{nu}{sub {tau}} (N=2,3,4). We assume that the new physics (NP) is a charged Higgs boson. We show that there is no NP contribution to {tau}{yields}{pi}{pi}{nu}{sub {tau}}, which means that no CP violation is expected in this decay. On the other hand, NP can contribute to {tau}{yields}N{pi}{nu}{sub {tau}} (N=3,4). These are dominated by the intermediate resonant decays {tau}{yields}{omega}{pi}{nu}{sub {tau}}, {tau}{yields}{rho}{pi}{nu}{sub {tau}}, and {tau}{yields}a{sub 1}{pi}{nu}{sub {tau}}. We show that the only sizeable CP-violating effects which are possible are in {tau}{yields}a{sub 1}{pi}{nu}{sub {tau}}{yields}4{pi}{nu}{sub {tau}} (polarization-dependent rate asymmetry) and {tau}{yields}{omega}{pi}{nu}{sub {tau}} (triple-product asymmetry)

• OSTI ID: 21020267
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
A1-1260 MESONS
ASYMMETRY
CP INVARIANCE
HIGGS BOSONS
NUCLEONS
OMEGA-782 MESONS
PARTICLE DECAY
PIONS
POLARIZATION
RHO-770 MESONS
TAU NEUTRINOS
TAU PARTICLES