Measurement of the CP asymmetry amplitude sin2β with B⁰ mesons

B Aubert; Theresa Harrison; Christopher Hawkes; David Knowles; Stephen O'Neale; Richard Penny; Alan Watson; Nigel Watson

doi:10.1103/PhysRevLett.89.201802

Measurement of the CP asymmetry amplitude sin2β with B⁰ mesons

B Aubert, Theresa Harrison, Christopher Hawkes, David Knowles, Stephen O'Neale, Richard Penny, Alan Watson, Nigel Watson

Physics and Astronomy

Research output: Contribution to journal › Article

304 Citations (Scopus)

Abstract

We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 x 10(6) Upsilon(4S)-->B(-)B decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We study 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 B(0) or B(-0) from its decay products. The amplitude of the CP asymmetry, which in the standard model is proportional to sin2beta, is derived from the decay-time distributions in such events. We measure sin2beta=0.741+/-0.067(stat)+/-0.034(syst) and |lambda|=0.948+/-0.051(stat)+/-0.030(syst). The magnitude of lambda is consistent with unity, in agreement with the standard model expectation of no direct CP violation in these modes.

Original language	English
Pages (from-to)	201802
Number of pages	1
Journal	Physical Review Letters
Volume	89
Issue number	20
Early online date	1 Oct 2002
DOIs	https://doi.org/10.1103/PhysRevLett.89.201802
Publication status	Published - 1 Nov 2002

Access to Document

10.1103/PhysRevLett.89.201802

Cite this

@article{72294eebf9bf46f599a83d08f919e457,

title = "Measurement of the CP asymmetry amplitude sin2β with B⁰ mesons",

abstract = "We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 x 10(6) Upsilon(4S)-->B(-)B decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We study 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 B(0) or B(-0) from its decay products. The amplitude of the CP asymmetry, which in the standard model is proportional to sin2beta, is derived from the decay-time distributions in such events. We measure sin2beta=0.741+/-0.067(stat)+/-0.034(syst) and |lambda|=0.948+/-0.051(stat)+/-0.030(syst). The magnitude of lambda is consistent with unity, in agreement with the standard model expectation of no direct CP violation in these modes.",

author = "B Aubert and Theresa Harrison and Christopher Hawkes and David Knowles and Stephen O'Neale and Richard Penny and Alan Watson and Nigel Watson",

year = "2002",

month = nov,

day = "1",

doi = "10.1103/PhysRevLett.89.201802",

language = "English",

volume = "89",

pages = "201802",

journal = "Physical Review Letters",

issn = "1079-7114",

publisher = "American Physical Society (APS)",

number = "20",

}

TY - JOUR

T1 - Measurement of the CP asymmetry amplitude sin2β with B⁰ mesons

AU - Aubert, B

AU - Harrison, Theresa

AU - Hawkes, Christopher

AU - Knowles, David

AU - O'Neale, Stephen

AU - Penny, Richard

AU - Watson, Alan

AU - Watson, Nigel

PY - 2002/11/1

Y1 - 2002/11/1

N2 - We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 x 10(6) Upsilon(4S)-->B(-)B decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We study 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 B(0) or B(-0) from its decay products. The amplitude of the CP asymmetry, which in the standard model is proportional to sin2beta, is derived from the decay-time distributions in such events. We measure sin2beta=0.741+/-0.067(stat)+/-0.034(syst) and |lambda|=0.948+/-0.051(stat)+/-0.030(syst). The magnitude of lambda is consistent with unity, in agreement with the standard model expectation of no direct CP violation in these modes.

AB - We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 x 10(6) Upsilon(4S)-->B(-)B decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We study 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 B(0) or B(-0) from its decay products. The amplitude of the CP asymmetry, which in the standard model is proportional to sin2beta, is derived from the decay-time distributions in such events. We measure sin2beta=0.741+/-0.067(stat)+/-0.034(syst) and |lambda|=0.948+/-0.051(stat)+/-0.030(syst). The magnitude of lambda is consistent with unity, in agreement with the standard model expectation of no direct CP violation in these modes.

U2 - 10.1103/PhysRevLett.89.201802

DO - 10.1103/PhysRevLett.89.201802

M3 - Article

C2 - 12443469

SN - 1079-7114

VL - 89

SP - 201802

JO - Physical Review Letters

JF - Physical Review Letters

IS - 20

ER -

Measurement of the CP asymmetry amplitude sin2β with B⁰ mesons

Abstract

Access to Document

Fingerprint

Cite this