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Observation of large CP violation and evidence for direct CP violation in B0+p- decays

Abe, K; Abe, K; Abe, N; Abe, T; Adachi, I; Aihara, H; Akai, K; ... Belle Collaboration, ; + view all (2004) Observation of large CP violation and evidence for direct CP violation in B0+p- decays. PHYS REV LETT , 93 (2) , Article 021601. 10.1103/PhysRevLett.93.021601. Green open access

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Abstract

We report the first observation of CP violation in B<SUP>0+p- decays based on 152x106 U(4S)B (B) over bar decays collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We reconstruct a B0+p- CP eigenstate and identify the flavor of the accompanying B meson from its decay products. From the distribution of the time intervals between the two B meson decay points, we obtain A</SUP><INF>pp</INF><SUP>=+0.580.15(stat)0.07(syst) and S</SUP><INF>pp</INF><SUP>=-1.000.21(stat)0.07(syst). We rule out the CP-conserving case, A</SUP><INF>pp</INF><SUP>=S</SUP><INF>pp</INF><SUP>=0, at a level of 5.2 standard deviations. We also find evidence for direct CP violation with a significance at or greater than 3.2 standard deviations for any S</SUP><INF>pp</INF> value.

Type: Article
Title: Observation of large CP violation and evidence for direct CP violation in B0+p- decays
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.93.021601
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.93.021601
Language: English
Additional information: The American Physical Society
Keywords: CP-VIOLATION, B-DECAYS
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1308432
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