Improved measurement of CP-violation in B → (cc̄) K (*)0 decays

David J. Lange

doi:10.1142/S0217751X05026881

Improved measurement of CP-violation in B → (cc̄) K ^(*)0 decays

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Abstract

We present results on time-dependent CP asymmetries in neutral B decays. The amplitude of the CP asymmetry, sin2β in the Standard Model, is derived from decay-time distributions from events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B⁰ or B̄⁰ from its decay products. Using data collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure sin2β = 0.722 ± 0.040(stat) ± 0.023(syst) and cos2β = 2.72_-0.79 ^+0.50(stat) ± 0.27(syst), determining the sign of cos2β to be positive at 86% CL.

Original language	English (US)
Pages (from-to)	3522-3526
Number of pages	5
Journal	International Journal of Modern Physics A
Volume	20
Issue number	15
DOIs	https://doi.org/10.1142/S0217751X05026881
State	Published - Jun 20 2005
Externally published	Yes

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics
Nuclear and High Energy Physics
Astronomy and Astrophysics

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10.1142/S0217751X05026881

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@article{cb1f9afbd20047078e17831b6653a2a7,

title = "Improved measurement of CP-violation in B → (c{\=c}) K (*)0 decays",

abstract = "We present results on time-dependent CP asymmetries in neutral B decays. The amplitude of the CP asymmetry, sin2β in the Standard Model, is derived from decay-time distributions from events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B0 or {\=B}0 from its decay products. Using data collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure sin2β = 0.722 ± 0.040(stat) ± 0.023(syst) and cos2β = 2.72-0.79 +0.50(stat) ± 0.27(syst), determining the sign of cos2β to be positive at 86% CL.",

author = "Lange, {David J.}",

note = "Funding Information: The author's work was performed under the auspices of the U.S. Department of Energy by University of California, Lawrence Livermore National Laboratory under Contract W-7405-Eng-48. The collaboration is grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality.",

year = "2005",

month = jun,

day = "20",

doi = "10.1142/S0217751X05026881",

language = "English (US)",

volume = "20",

pages = "3522--3526",

journal = "International Journal of Modern Physics A",

issn = "0217-751X",

publisher = "World Scientific Publishing Co. Pte Ltd",

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TY - JOUR

T1 - Improved measurement of CP-violation in B → (cc̄) K (*)0 decays

AU - Lange, David J.

N1 - Funding Information: The author's work was performed under the auspices of the U.S. Department of Energy by University of California, Lawrence Livermore National Laboratory under Contract W-7405-Eng-48. The collaboration is grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality.

PY - 2005/6/20

Y1 - 2005/6/20

N2 - We present results on time-dependent CP asymmetries in neutral B decays. The amplitude of the CP asymmetry, sin2β in the Standard Model, is derived from decay-time distributions from events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B0 or B̄0 from its decay products. Using data collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure sin2β = 0.722 ± 0.040(stat) ± 0.023(syst) and cos2β = 2.72-0.79 +0.50(stat) ± 0.27(syst), determining the sign of cos2β to be positive at 86% CL.

AB - We present results on time-dependent CP asymmetries in neutral B decays. The amplitude of the CP asymmetry, sin2β in the Standard Model, is derived from decay-time distributions from events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B0 or B̄0 from its decay products. Using data collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure sin2β = 0.722 ± 0.040(stat) ± 0.023(syst) and cos2β = 2.72-0.79 +0.50(stat) ± 0.27(syst), determining the sign of cos2β to be positive at 86% CL.

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U2 - 10.1142/S0217751X05026881

DO - 10.1142/S0217751X05026881

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SN - 0217-751X

VL - 20

SP - 3522

EP - 3526

JO - International Journal of Modern Physics A

JF - International Journal of Modern Physics A

IS - 15

ER -

Improved measurement of CP-violation in B → (cc̄) K ^(*)0 decays

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