Subtleties in the B a B ar measurement of time-reversal violation

Elaad Applebaum, Aielet Efrati, Yuval Grossman, Yosef Nir, Yotam Soreq

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24 Scopus citations


A first measurement of time-reversal (T) asymmetries that are not also CP asymmetries has been recently achieved by the BaBar collaboration. We analyze the measured asymmetries in the presence of direct CP violation, CPTviolation, wrong strangeness decays and wrong sign semileptonic decays. We note that the commonly used SψK and CψK parameters are CP-odd, but have a T-odd CPT-even part and a T-even CPT-odd part. We introduce parameters that have well-defined transformation properties under CP, T and CPT. We identify contributions to the measured asymmetries that are T conserving. We explain why, in order that the measured asymmetries would be purely odd under time-reversal, there is no need to assume the absence of direct CP violation. Instead, one needs to assume (i) the absence of CPT violation in strangeness changing decays, and (ii) the absence of wrong sign decays.

Original languageEnglish
Article number076011
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number7
StatePublished - 30 Apr 2014
Externally publishedYes


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