Direct CP violation of B{yields}l{nu} in unparticle physics

Journal Article · Tue Apr 01 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.075014· OSTI ID:21249970

Chaoshang, Huang ^[1]; Xiaohong, Wu ^[2]

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1. Department of Physics, Henan Normal University, Xinxiang, Henan 453007 (China)
2. School of Physics, Korea Institute for Advanced Study, 207-43, Cheongryangri 2-dong, Dongdaemun-gu, Seoul 130-722 (Korea, Republic of)

We have investigated the effects of unparticles in decays B{yields}l{nu}. 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={tau}, 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{yields}{tau}{nu}) and {nu}e elastic scattering. If both unparticle-lepton coupling universality and unparticle-quark coupling universality are assumed the constraint from Br({pi}{yields}{mu}{nu}) leads that the direct CP violation in B{yields}l{nu} can only reach at most 8% and 1% for scalar and vector unparticle contributions, respectively, if d{sub U}<2. If the direct CP violation is observed in the future it would give strong evidence for the existence of unparticle stuff.

• OSTI ID: 21249970
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B MESONS
COUPLING
CP INVARIANCE
ELASTIC SCATTERING
ELECTRON NEUTRINOS
LEPTONS
MUON NEUTRINOS
PARTICLE DECAY
PIONS
QUARKS
STANDARD MODEL
TAU NEUTRINOS