Triple-product asymmetries in K, D{sub (s)}, and B{sub (s)} decays

Journal Article · Tue Nov 01 04:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.84.096013· OSTI ID:21608087

Gronau, Michael; Rosner, Jonathan L ^[1]

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1. Physics Department, Technion-Israel Institute of Technology, Haifa 32000 (Israel)

One distinguishes between 'true' CP-violating triple-product (TP) asymmetries which require no strong phases and 'fake' asymmetries which are due to strong phases but require no CP violation. So far a single true TP asymmetry has been measured in K{sub L}{yields}{pi}{sup +}{pi}{sup -}e{sup +}e{sup -}. A general discussion is presented for T-odd TP asymmetries in four-body decays. It is shown that TP asymmetries vanish for two identical and kinematically indistinguishable particles in the final state. Two examples are D{sup 0}{yields}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup +} and D{sup +}{yields}K{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup 0}. A nonzero TP asymmetry can be expected when nontrivial kinematic correlations exist, as in the decay K{sub L}{yields}e{sup +}e{sup -}e{sup +}e{sup -}. Triple-product asymmetries measured in charmed particle decays indicate an interesting pattern of final-state interactions. We reiterate a discussion of TP asymmetries in B meson decays to two vector mesons each decaying to a pseudoscalar pair, extending results to decays where one vector meson decays into a lepton pair. We derive expressions for time-dependent TP asymmetries for neutral B decays to flavorless states in terms of the neutral B mass difference {Delta}m and the width-difference {Delta}{Gamma}. Time-integrated true CP-violating asymmetries, measurable for untagged B{sub s} decays, are shown to be suppressed by neither {Gamma}{sub s}/{Delta}m{sub s} nor {Delta}{Gamma}{sub s}/{Gamma}{sub s} if transversity amplitudes for CP-even and CP-odd states involve different weak phases. In contrast, fake asymmetries require flavor tagging and are suppressed by the former ratio when time integrated. We apply our results to B{yields}K{sup *}{phi} and B{sub s}{yields}{phi}{phi} data and suggest an application for B{sub s}{yields}J/{psi}{phi}.

• OSTI ID: 21608087
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 84; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ASYMMETRY
B MESONS
B S MESONS
BEAUTY MESONS
BEAUTY PARTICLES
BOSONS
CHARM PARTICLES
CHARMED MESONS
COMPOSITE MODELS
CORRELATIONS
CP INVARIANCE
D MESONS
D NEUTRAL MESONS
DECAY
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
FINAL-STATE INTERACTIONS
FLAVOR MODEL
FOUR-BODY PROBLEM
HADRONS
INTERACTIONS
INVARIANCE PRINCIPLES
KAONS
KAONS MINUS
LEPTONS
MANY-BODY PROBLEM
MASS DIFFERENCE
MATHEMATICAL MODELS
MATTER
MESONS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PROPERTIES
PHI MESONS
POSITRONS
PSEUDOSCALAR MESONS
QUARK MODEL
STRANGE MESONS
STRANGE PARTICLES
TIME DEPENDENCE
VECTOR MESONS