Difference in B{sup +} and B{sup 0} Direct CP Asymmetry as an Effect of a Fourth Generation

Journal Article · Fri Sep 30 04:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.141601· OSTI ID:20696513

Hou, W -S; Nagashima, Makiko; Soddu, Andrea ^[1]

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1. Department of Physics, National Taiwan University, Taipei, Taiwan 106 (China)

Direct CP violation in B{sup 0}{yields}K{sup +}{pi}{sup -} decay has emerged at the -10% level, but the asymmetry in B{sup +}{yields}K{sup +}{pi}{sup 0} mode is consistent with zero. This difference points towards possible new physics in the electroweak penguin operator. We point out that a sequential fourth generation, with sizable V{sub t{sup '}}{sub s}*V{sub t{sup '}}{sub b} and near maximal phase, could be a natural cause. We use the perturbative QCD factorization approach for B{yields}K{pi} amplitudes. While the B{sup 0}{yields}K{sup +}{pi}{sup -} mode is insensitive to t{sup '}, we critically compare t{sup '} effects on direct CP violation in B{sup +}{yields}K{sup +}{pi}{sup 0} with b{yields}sl{sup +}l{sup -} and B{sub s} mixing. If the K{sup +}{pi}{sup 0}-K{sup +}{pi}{sup -} asymmetry difference persists, we predict sin2{phi}{sub B{sub s}} to be negative.

• OSTI ID: 20696513
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B NEUTRAL MESONS
B PLUS MESONS
CP INVARIANCE
FACTORIZATION
HADRONIC PARTICLE DECAY
KAONS PLUS
PERTURBATION THEORY
PIONS MINUS
PIONS NEUTRAL
QUANTUM CHROMODYNAMICS