Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/133262
Title: | Observation of Time-Reversal Violation in the B0 Meson System |
Author: | Garra Ticó, Jordi Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 19-Nov-2012 |
Publisher: | American Physical Society |
Abstract: | Although C P 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 ( B 0 or ¯¯¯ B 0 ), and J / ψ K 0 L or c ¯ c K 0 S final states (referred to as B + or B − ), allow comparisons between the probabilities of four pairs of T -conjugated transitions, for example, ¯¯¯ B 0 → B − and B − → ¯¯¯ B 0 , as a function of the time difference between the two B decays. Using 468 × 10 6 B ¯¯¯ B pairs produced in Υ ( 4 S ) decays collected by the BABAR detector at SLAC, we measure T -violating parameters in the time evolution of neutral B mesons, yielding Δ S + T = − 1.37 ± 0.14 ( stat ) ± 0.06 ( syst ) and Δ S − T = 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. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.109.211801 |
It is part of: | Physical Review Letters, 2012, vol. 109, num. 21, p. 211801 |
URI: | http://hdl.handle.net/2445/133262 |
Related resource: | https://doi.org/10.1103/PhysRevLett.109.211801 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
632429.pdf | 295.15 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.