BABAR Collaboration (Including: Gershon, T. J., Harrison, P. F. and Latham, Thomas). (2012) Observation of time-reversal violation in the B0 Meson system. Physical Review Letters, Volume 109 (Number 21). Article number 211801. doi:10.1103/PhysRevLett.109.211801 ISSN 0031-9007.

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Abstract

Although CP violation in the B meson system has been well established by the B factories, there has been no direct observation of time-reversal violation. The decays of entangled neutral B mesons into definite flavor states (B0 or B̅ 0), and J/ψKL0 or cc̅ KS0 final states (referred to as B+ or B-), allow comparisons between the probabilities of four pairs of T-conjugated transitions, for example, B̅ 0→B- and B-→B̅ 0, as a function of the time difference between the two B decays. Using 468×106 BB̅ pairs produced in Υ(4S) decays collected by the BABAR detector at SLAC, we measure T-violating parameters in the time evolution of neutral B mesons, yielding ΔST+=-1.37±0.14(stat)±0.06(syst) and ΔST-=1.17±0.18(stat)±0.11(syst). These nonzero results represent the first direct observation of T violation through the exchange of initial and final states in transitions that can only be connected by a T-symmetry transformation.

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Official Date:	2012
Dates:	Date Event 2012 Published
Volume:	Volume 109
Number:	Number 21
Number of Pages:	21
Page Range:	Article number 211801
DOI:	10.1103/PhysRevLett.109.211801
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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