Study of time-dependent CP-violating asymmetries and flavor oscillations in neutral B decays at the Υ(4S)

B. Aubert; D. Boutigny; J. M. Gaillard; A. Hicheur; Y. Karyotakis; J. P. Lees; P. Robbe; V. Tisserand; A. Palano; A. Pompili; G. P. Chen; J. C. Chen; N. D. Qi; G. Rong; P. Wang; Y. S. Zhu; G. Eigen; B. Stugu; G. S. Abrams; A. W. Borgland; A. B. Breon; D. N. Brown; J. Button-Shafer; R. N. Cahn; A. R. Clark; M. S. Gill; A. V. Gritsan; Y. Groysman; R. G. Jacobsen; R. W. Kadel; J. Kadyk; L. T. Kerth; Yu G. Kolomensky; J. F. Kral; C. LeClerc; M. E. Levi; G. Lynch; P. J. Oddone; M. Pripstein; N. A. Roe; A. Romosan; M. T. Ronan; V. G. Shelkov; A. V. Telnov; W. A. Wenzel; T. J. Harrison; C. M. Hawkes; D. J. Knowles; S. W. O'Neale; R. C. Penny

Study of time-dependent CP-violating asymmetries and flavor oscillations in neutral B decays at the Υ(4S)

B. Aubert, D. Boutigny, J. M. Gaillard, A. Hicheur, Y. Karyotakis, J. P. Lees, P. Robbe, V. Tisserand, A. Palano, A. Pompili, G. P. Chen, J. C. Chen, N. D. Qi, G. Rong, P. Wang, Y. S. Zhu, G. Eigen, B. Stugu, G. S. Abrams, A. W. BorglandA. B. Breon, D. N. Brown, J. Button-Shafer, R. N. Cahn, A. R. Clark, M. S. Gill, A. V. Gritsan, Y. Groysman, R. G. Jacobsen, R. W. Kadel, J. Kadyk, L. T. Kerth, Yu G. Kolomensky, J. F. Kral, C. LeClerc, M. E. Levi, G. Lynch, P. J. Oddone, M. Pripstein, N. A. Roe, A. Romosan, M. T. Ronan, V. G. Shelkov, A. V. Telnov, W. A. Wenzel, T. J. Harrison, C. M. Hawkes, D. J. Knowles, S. W. O'Neale, R. C. Penny

Physics

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Abstract

We present a measurement of time-dependent CP-violating asymmetries in neutral B meson decays collected with the BABAR detector at the PEP-II asymmetric-energy e⁺e^- collider at the Stanford Linear Accelerator Center. The data sample consists of 29.7 fb^-1 recorded at the Υ(4S) resonance and 3.9 fb^-1 off resonance. One of the neutral B mesons, which are produced in pairs at the Υ(4S), is fully reconstructed in the CP decay modes J/ΨK_S ⁰, Ψ(2S)K_S ⁰, X_c1K_S ⁰, J/ΨK*⁰ (K*⁰→K_s ⁰π⁰) and J/ΨK_L ⁰, or in flavor-eigenstate modes involving D(*)π/ρ/a₁ and J/ΨK*⁰ (K*⁰→K⁺π^-). The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural network tagging algorithm is used to recover events without a clear lepton or kaon tag. The proper time elapsed between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities, the time-difference resolution function, and the B⁰-B̄⁰ oscillation frequency Δm_d are measured with a sample of about 6350 fully-reconstructed B⁰ decays in hadronic flavor-eigenstate modes. A maximum-likelihood fit to this flavor eigenstate sample finds Δm_d=0.516±0.016(stat)±0.010(syst) ps^-1. The value of the asymmetry amplitude sin 2Β is determined from a simultaneous maximum-likelihood fit to the time-difference distribution of the flavor-eigenstate sample and about 642 tagged B⁰ decays in the CP-eigenstate modes. We find sin 2Β=0.59 ±0.14(stat)±0.05(syst), demonstrating that CP violation exists in the neutral B meson system. We also determine the value of the CP violation parameter |λ|=0.93±0.09(stat)±0.03(syst), which is consistent with the expectation of |λ|=1 for no direct CP violation.

Original language	English (US)
Article number	032003
Pages (from-to)	320031-3200354
Number of pages	2880324
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	66
Issue number	3
State	Published - Aug 1 2002

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

Cite this

Aubert, B., Boutigny, D., Gaillard, J. M., Hicheur, A., Karyotakis, Y., Lees, J. P., Robbe, P., Tisserand, V., Palano, A., Pompili, A., Chen, G. P., Chen, J. C., Qi, N. D., Rong, G., Wang, P., Zhu, Y. S., Eigen, G., Stugu, B., Abrams, G. S., ... Penny, R. C. (2002). Study of time-dependent CP-violating asymmetries and flavor oscillations in neutral B decays at the Υ(4S). Physical Review D - Particles, Fields, Gravitation and Cosmology, 66(3), 320031-3200354. [032003].

@article{c99a7fb7376e4da78d0107b96302ba31,

title = "Study of time-dependent CP-violating asymmetries and flavor oscillations in neutral B decays at the Υ(4S)",

abstract = "We present a measurement of time-dependent CP-violating asymmetries in neutral B meson decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center. The data sample consists of 29.7 fb-1 recorded at the Υ(4S) resonance and 3.9 fb-1 off resonance. One of the neutral B mesons, which are produced in pairs at the Υ(4S), is fully reconstructed in the CP decay modes J/ΨKS 0, Ψ(2S)KS 0, Xc1KS 0, J/ΨK*0 (K*0→Ks 0π0) and J/ΨKL 0, or in flavor-eigenstate modes involving D(*)π/ρ/a1 and J/ΨK*0 (K*0→K+π-). The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural network tagging algorithm is used to recover events without a clear lepton or kaon tag. The proper time elapsed between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities, the time-difference resolution function, and the B0-{\=B}0 oscillation frequency Δmd are measured with a sample of about 6350 fully-reconstructed B0 decays in hadronic flavor-eigenstate modes. A maximum-likelihood fit to this flavor eigenstate sample finds Δmd=0.516±0.016(stat)±0.010(syst) ps-1. The value of the asymmetry amplitude sin 2Β is determined from a simultaneous maximum-likelihood fit to the time-difference distribution of the flavor-eigenstate sample and about 642 tagged B0 decays in the CP-eigenstate modes. We find sin 2Β=0.59 ±0.14(stat)±0.05(syst), demonstrating that CP violation exists in the neutral B meson system. We also determine the value of the CP violation parameter |λ|=0.93±0.09(stat)±0.03(syst), which is consistent with the expectation of |λ|=1 for no direct CP violation.",

author = "B. Aubert and D. Boutigny and Gaillard, {J. M.} and A. Hicheur and Y. Karyotakis and Lees, {J. P.} and P. Robbe and V. Tisserand and A. Palano and A. Pompili and Chen, {G. P.} and Chen, {J. C.} and Qi, {N. D.} and G. Rong and P. Wang and Zhu, {Y. S.} and G. Eigen and B. Stugu and Abrams, {G. S.} and Borgland, {A. W.} and Breon, {A. B.} and Brown, {D. N.} and J. Button-Shafer and Cahn, {R. N.} and Clark, {A. R.} and Gill, {M. S.} and Gritsan, {A. V.} and Y. Groysman and Jacobsen, {R. G.} and Kadel, {R. W.} and J. Kadyk and Kerth, {L. T.} and Kolomensky, {Yu G.} and Kral, {J. F.} and C. LeClerc and Levi, {M. E.} and G. Lynch and Oddone, {P. J.} and M. Pripstein and Roe, {N. A.} and A. Romosan and Ronan, {M. T.} and Shelkov, {V. G.} and Telnov, {A. V.} and Wenzel, {W. A.} and Harrison, {T. J.} and Hawkes, {C. M.} and Knowles, {D. J.} and O'Neale, {S. W.} and Penny, {R. C.}",

year = "2002",

month = aug,

day = "1",

language = "English (US)",

volume = "66",

pages = "320031--3200354",

journal = "Physical review D: Particles and fields",

issn = "1550-7998",

publisher = "American Physical Society",

number = "3",

}

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW & Penny, RC 2002, 'Study of time-dependent CP-violating asymmetries and flavor oscillations in neutral B decays at the Υ(4S)', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 66, no. 3, 032003, pp. 320031-3200354.

TY - JOUR

T1 - Study of time-dependent CP-violating asymmetries and flavor oscillations in neutral B decays at the Υ(4S)

AU - Aubert, B.

AU - Boutigny, D.

AU - Gaillard, J. M.

AU - Hicheur, A.

AU - Karyotakis, Y.

AU - Lees, J. P.

AU - Robbe, P.

AU - Tisserand, V.

AU - Palano, A.

AU - Pompili, A.

AU - Chen, G. P.

AU - Chen, J. C.

AU - Qi, N. D.

AU - Rong, G.

AU - Wang, P.

AU - Zhu, Y. S.

AU - Eigen, G.

AU - Stugu, B.

AU - Abrams, G. S.

AU - Borgland, A. W.

AU - Breon, A. B.

AU - Brown, D. N.

AU - Button-Shafer, J.

AU - Cahn, R. N.

AU - Clark, A. R.

AU - Gill, M. S.

AU - Gritsan, A. V.

AU - Groysman, Y.

AU - Jacobsen, R. G.

AU - Kadel, R. W.

AU - Kadyk, J.

AU - Kerth, L. T.

AU - Kolomensky, Yu G.

AU - Kral, J. F.

AU - LeClerc, C.

AU - Levi, M. E.

AU - Lynch, G.

AU - Oddone, P. J.

AU - Pripstein, M.

AU - Roe, N. A.

AU - Romosan, A.

AU - Ronan, M. T.

AU - Shelkov, V. G.

AU - Telnov, A. V.

AU - Wenzel, W. A.

AU - Harrison, T. J.

AU - Hawkes, C. M.

AU - Knowles, D. J.

AU - O'Neale, S. W.

AU - Penny, R. C.

PY - 2002/8/1

Y1 - 2002/8/1

N2 - We present a measurement of time-dependent CP-violating asymmetries in neutral B meson decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center. The data sample consists of 29.7 fb-1 recorded at the Υ(4S) resonance and 3.9 fb-1 off resonance. One of the neutral B mesons, which are produced in pairs at the Υ(4S), is fully reconstructed in the CP decay modes J/ΨKS 0, Ψ(2S)KS 0, Xc1KS 0, J/ΨK*0 (K*0→Ks 0π0) and J/ΨKL 0, or in flavor-eigenstate modes involving D(*)π/ρ/a1 and J/ΨK*0 (K*0→K+π-). The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural network tagging algorithm is used to recover events without a clear lepton or kaon tag. The proper time elapsed between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities, the time-difference resolution function, and the B0-B̄0 oscillation frequency Δmd are measured with a sample of about 6350 fully-reconstructed B0 decays in hadronic flavor-eigenstate modes. A maximum-likelihood fit to this flavor eigenstate sample finds Δmd=0.516±0.016(stat)±0.010(syst) ps-1. The value of the asymmetry amplitude sin 2Β is determined from a simultaneous maximum-likelihood fit to the time-difference distribution of the flavor-eigenstate sample and about 642 tagged B0 decays in the CP-eigenstate modes. We find sin 2Β=0.59 ±0.14(stat)±0.05(syst), demonstrating that CP violation exists in the neutral B meson system. We also determine the value of the CP violation parameter |λ|=0.93±0.09(stat)±0.03(syst), which is consistent with the expectation of |λ|=1 for no direct CP violation.

AB - We present a measurement of time-dependent CP-violating asymmetries in neutral B meson decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center. The data sample consists of 29.7 fb-1 recorded at the Υ(4S) resonance and 3.9 fb-1 off resonance. One of the neutral B mesons, which are produced in pairs at the Υ(4S), is fully reconstructed in the CP decay modes J/ΨKS 0, Ψ(2S)KS 0, Xc1KS 0, J/ΨK*0 (K*0→Ks 0π0) and J/ΨKL 0, or in flavor-eigenstate modes involving D(*)π/ρ/a1 and J/ΨK*0 (K*0→K+π-). The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural network tagging algorithm is used to recover events without a clear lepton or kaon tag. The proper time elapsed between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities, the time-difference resolution function, and the B0-B̄0 oscillation frequency Δmd are measured with a sample of about 6350 fully-reconstructed B0 decays in hadronic flavor-eigenstate modes. A maximum-likelihood fit to this flavor eigenstate sample finds Δmd=0.516±0.016(stat)±0.010(syst) ps-1. The value of the asymmetry amplitude sin 2Β is determined from a simultaneous maximum-likelihood fit to the time-difference distribution of the flavor-eigenstate sample and about 642 tagged B0 decays in the CP-eigenstate modes. We find sin 2Β=0.59 ±0.14(stat)±0.05(syst), demonstrating that CP violation exists in the neutral B meson system. We also determine the value of the CP violation parameter |λ|=0.93±0.09(stat)±0.03(syst), which is consistent with the expectation of |λ|=1 for no direct CP violation.

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M3 - Article

SN - 1550-7998

VL - 66

SP - 320031

EP - 3200354

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

IS - 3

M1 - 032003

ER -

Study of time-dependent CP-violating asymmetries and flavor oscillations in neutral B decays at the Υ(4S)

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