# CP violation in hadronic {tau} decays

## Abstract

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)

- Authors:

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

- Publication Date:

- OSTI Identifier:
- 21020267

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.75.074007; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 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

### Citation Formats

```
Datta, Alakabha, Kiers, Ken, London, David, Szynkman, Alejandro, and O'Donnell, Patrick J.
```*CP violation in hadronic {tau} decays*. United States: N. p., 2007.
Web. doi:10.1103/PHYSREVD.75.074007.

```
Datta, Alakabha, Kiers, Ken, London, David, Szynkman, Alejandro, & O'Donnell, Patrick J.
```*CP violation in hadronic {tau} decays*. United States. doi:10.1103/PHYSREVD.75.074007.

```
Datta, Alakabha, Kiers, Ken, London, David, Szynkman, Alejandro, and O'Donnell, Patrick J. Sun .
"CP violation in hadronic {tau} decays". United States.
doi:10.1103/PHYSREVD.75.074007.
```

```
@article{osti_21020267,
```

title = {CP violation in hadronic {tau} decays},

author = {Datta, Alakabha and Kiers, Ken and London, David and Szynkman, Alejandro and O'Donnell, Patrick J.},

abstractNote = {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)},

doi = {10.1103/PHYSREVD.75.074007},

journal = {Physical Review. D, Particles Fields},

number = 7,

volume = 75,

place = {United States},

year = {Sun Apr 01 00:00:00 EDT 2007},

month = {Sun Apr 01 00:00:00 EDT 2007}

}