Direct CP violation of B→lν in unparticle physics
Abstract
We have investigated the effects of unparticles in decays B→lν. It is found that the direct CP violation in the decays, which is zero in the standard model, can show up due to the CP conserving phase intrinsic in unparticle physics. For l=τ, the direct CP asymmetry can reach 30% for the scalar unparticle contribution, and 100% for the longitudinal vector unparticle contribution under the constraints of Br(B→τν) and νe elastic scattering. If both unparticle-lepton coupling universality and unparticle-quark coupling universality are assumed the constraint from Br(π→μν) leads that the direct CP violation in B→lν can only reach at most 8% and 1% for scalar and vector unparticle contributions, respectively, if dU<2. If the direct CP violation is observed in the future it would give strong evidence for the existence of unparticle stuff.
- Publication:
-
Physical Review D
- Pub Date:
- April 2008
- DOI:
- 10.1103/PhysRevD.77.075014
- arXiv:
- arXiv:0707.1268
- Bibcode:
- 2008PhRvD..77g5014H
- Keywords:
-
- 12.60.-i;
- 11.30.Er;
- 13.25.Hw;
- Models beyond the standard model;
- Charge conjugation parity time reversal and other discrete symmetries;
- Decays of bottom mesons;
- High Energy Physics - Phenomenology
- E-Print:
- 9 pages, 2 figures, to appear in PRD