Measurement of time-dependent CP asymmetries in B⁰ → D(*)±π∓ decays and constraints on sin (2β+γ)

B Aubert; Theresa Harrison; Kelly Ford; Christopher Hawkes; David Knowles; Sian Morgan; Richard Penny; Alan Watson; Nigel Watson

doi:10.1103/PhysRevLett.92.251801

Measurement of time-dependent CP asymmetries in B⁰ → D(*)±π∓ decays and constraints on sin (2β+γ)

B Aubert, Theresa Harrison, Kelly Ford, Christopher Hawkes, David Knowles, Sian Morgan, Richard Penny, Alan Watson, Nigel Watson

Physics and Astronomy

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Abstract

We present a measurement of CP-violating asymmetries in fully reconstructed B0-->D(*)+/-pi-/+ decays in approximately 88 x 10(6) upsilon(4S)-->BBmacr; decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. From a time-dependent maximum-likelihood fit we obtain the following for the CP-violating parameters: a=-0.022+/-0.038 (stat)+/-0.020 (syst), a*=-0.068+/-0.038 (stat)+/-0.020 (syst), c(lep)=+0.025+/-0.068 (stat)+/-0.033 (syst), and c*(lep)=+0.031+/-0.070 (stat)+/-0.033 (syst). Using other measurements and theoretical assumptions we interpret the results in terms of the angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle, and find |sin((2beta+gamma)|>0.69 at 68% confidence level. We exclude the hypothesis of no CP violation [sin(2beta+gamma)=0] at 83% confidence level.

Original language	English
Pages (from-to)	251801
Number of pages	1
Journal	Physical Review Letters
Volume	92
Issue number	25
Early online date	1 Jun 2004
DOIs	https://doi.org/10.1103/PhysRevLett.92.251801
Publication status	Published - 1 Jun 2004

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title = "Measurement of time-dependent CP asymmetries in B⁰ → D(*)±π∓ decays and constraints on sin (2β+γ)",

abstract = "We present a measurement of CP-violating asymmetries in fully reconstructed B0-->D(*)+/-pi-/+ decays in approximately 88 x 10(6) upsilon(4S)-->BBmacr; decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. From a time-dependent maximum-likelihood fit we obtain the following for the CP-violating parameters: a=-0.022+/-0.038 (stat)+/-0.020 (syst), a*=-0.068+/-0.038 (stat)+/-0.020 (syst), c(lep)=+0.025+/-0.068 (stat)+/-0.033 (syst), and c*(lep)=+0.031+/-0.070 (stat)+/-0.033 (syst). Using other measurements and theoretical assumptions we interpret the results in terms of the angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle, and find |sin((2beta+gamma)|>0.69 at 68% confidence level. We exclude the hypothesis of no CP violation [sin(2beta+gamma)=0] at 83% confidence level.",

author = "B Aubert and Theresa Harrison and Kelly Ford and Christopher Hawkes and David Knowles and Sian Morgan and Richard Penny and Alan Watson and Nigel Watson",

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doi = "10.1103/PhysRevLett.92.251801",

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T1 - Measurement of time-dependent CP asymmetries in B⁰ → D(*)±π∓ decays and constraints on sin (2β+γ)

AU - Aubert, B

AU - Harrison, Theresa

AU - Ford, Kelly

AU - Hawkes, Christopher

AU - Knowles, David

AU - Morgan, Sian

AU - Penny, Richard

AU - Watson, Alan

AU - Watson, Nigel

PY - 2004/6/1

Y1 - 2004/6/1

N2 - We present a measurement of CP-violating asymmetries in fully reconstructed B0-->D(*)+/-pi-/+ decays in approximately 88 x 10(6) upsilon(4S)-->BBmacr; decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. From a time-dependent maximum-likelihood fit we obtain the following for the CP-violating parameters: a=-0.022+/-0.038 (stat)+/-0.020 (syst), a*=-0.068+/-0.038 (stat)+/-0.020 (syst), c(lep)=+0.025+/-0.068 (stat)+/-0.033 (syst), and c*(lep)=+0.031+/-0.070 (stat)+/-0.033 (syst). Using other measurements and theoretical assumptions we interpret the results in terms of the angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle, and find |sin((2beta+gamma)|>0.69 at 68% confidence level. We exclude the hypothesis of no CP violation [sin(2beta+gamma)=0] at 83% confidence level.

AB - We present a measurement of CP-violating asymmetries in fully reconstructed B0-->D(*)+/-pi-/+ decays in approximately 88 x 10(6) upsilon(4S)-->BBmacr; decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. From a time-dependent maximum-likelihood fit we obtain the following for the CP-violating parameters: a=-0.022+/-0.038 (stat)+/-0.020 (syst), a*=-0.068+/-0.038 (stat)+/-0.020 (syst), c(lep)=+0.025+/-0.068 (stat)+/-0.033 (syst), and c*(lep)=+0.031+/-0.070 (stat)+/-0.033 (syst). Using other measurements and theoretical assumptions we interpret the results in terms of the angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle, and find |sin((2beta+gamma)|>0.69 at 68% confidence level. We exclude the hypothesis of no CP violation [sin(2beta+gamma)=0] at 83% confidence level.

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DO - 10.1103/PhysRevLett.92.251801

M3 - Article

C2 - 15244995

SN - 1079-7114

VL - 92

SP - 251801

JO - Physical Review Letters

JF - Physical Review Letters

IS - 25

ER -

Measurement of time-dependent CP asymmetries in B⁰ → D(*)±π∓ decays and constraints on sin (2β+γ)

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