Mixing-induced CP violation in B{yields}P{sub 1}P{sub 2}{gamma} in search of clean new physics signals

Journal Article · Fri Apr 01 00:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.076003· OSTI ID:20709017

Atwood, David; Gershon, Tim; Hazumi, Masashi; Soni, Amarjit ^[1]

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1. Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)

We show that in a decay of the form B{sub d} or B{sub s}{yields}P{sub 1}P{sub 2}{gamma} (where P{sub 1} and P{sub 2} are pseudoscalar mesons), through a flavor changing dipole transition, time dependent oscillations can reveal the presence of physics beyond the standard model. If P{sub 1} and P{sub 2} are CP eigenstates (e.g. as in B{sub d}{yields}K{sub S}{pi}{sup 0}{gamma}), then to leading order in the effective Hamiltonian, the oscillation is independent of the resonance structure. Thus data from resonances as well as from nonresonant decays can be included. This may significantly enhance the sensitivity to new physics of the method. If P{sub 1} is a charged particle, and P{sub 2} its antiparticle (e.g. as in B{sub d}{yields}{pi}{sup +}{pi}{sup -}{gamma}), one has the additional advantage that both the magnitude and the weak phase of any new physics contribution can be determined from a study of the angular distribution. These signals offer excellent ways to detect new physics because they are suppressed in the standard model. We also show that the potential contamination of these signals originating from the standard model annihilation diagram gives rise to photons with, to a very good approximation, the same helicity as the dominant penguin graph and thus causes no serious difficulty. The formalism which applies to the case where P{sub 1} and P{sub 2} are C eigenstates also further generalizes to the case of final states containing multiple C eigenstates and a photon. This suggests several additional channels to search for new physics, such as K{sub S}{eta}{sup '}({eta}){gamma}, {phi}K{sub S}{gamma} etc. We also emphasize that the contribution of nondipole interactions can be monitored by the dependence of the mixing-induced CP asymmetry of nonresonant modes on the Dalitz variables. Furthermore, using a number of different final states can also provide important information on the contribution from nondipole effects.

• OSTI ID: 20709017
• Journal Information: Physical Review. D, Particles Fields, Vol. 71, Issue 7; Other Information: DOI: 10.1103/PhysRevD.71.076003; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ANNIHILATION
ANTIPARTICLES
ASYMMETRY
B MESONS
C INVARIANCE
CP INVARIANCE
DIPOLES
EIGENFUNCTIONS
EIGENSTATES
EIGENVALUES
FEYNMAN DIAGRAM
GAUGE INVARIANCE
HADRONIC PARTICLE DECAY
HAMILTONIANS
HELICITY
MIXING
OSCILLATIONS
PHOTONS
PIONS MINUS
PIONS PLUS
RESONANCE PARTICLES
STANDARD MODEL
TIME DEPENDENCE