Improved measurement of CP-violation parameters sin2{phi}{sub 1} and |{lambda}|, B meson lifetimes, and B{sup 0}-B{sup 0} mixing parameter {delta}m{sub d}

Journal Article · Fri Apr 01 04:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.072003· OSTI ID:20708952

Abe, K; Adachi, I; Gershon, T; Haba, J; Hara, K; Hastings, N C; Hazumi, M; Higuchi, T; Ishikawa, A; Itoh, R; Iwasaki, Y; Katayama, N; Kichimi, H; Koppenburg, P; Nakamura, I; Nakao, M; Nishida, S; Nozaki, T; Ozaki, H; Sagawa, H ^[1]

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1. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan); and others

We present a precise measurement of the standard model CP-violation parameter sin2{phi}{sub 1}, the direct CP violation parameter |{lambda}|, the lifetimes of charged and neutral B mesons and their ratio, and the B{sup 0}-B{sup 0} mixing parameter {delta}m{sub d} based on a sample of 152x10{sup 6} BB pairs collected at the {upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. One of two B mesons is fully reconstructed in a CP-eigenstate or a flavor-eigenstate decay channel. The flavor of the accompanying B meson is identified from its decay products. From the distributions of the time interval between the two B meson decay points, we obtain sin2{phi}{sub 1}=0.728{+-}0.056(stat){+-}0.023(syst), |{lambda}|=1.007{+-}0.041(stat){+-}0.033(syst), {tau}{sub B{sup 0}}=[1.534{+-}0.008(stat){+-}0.010(syst)] ps, {tau}{sub B{sup +}}=[1.635{+-}0.011(stat){+-}0.011(syst)] ps, {tau}{sub B{sup +}}/{tau}{sub B{sup 0}}=1.066{+-}0.008(stat){+-}0.008(syst) and {delta}m{sub d}=[0.511{+-}0.005(stat){+-}0.006(syst)] ps{sup -1}. The results for sin2{phi}{sub 1} and |{lambda}| are consistent with the standard model expectations. The significance of the observed deviation from unity in the lifetime ratio exceeds 5 standard deviations.

• OSTI ID: 20708952
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 71; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B NEUTRAL MESONS
CP INVARIANCE
DISTRIBUTION
EIGENFUNCTIONS
EIGENSTATES
EIGENVALUES
ELECTRON-POSITRON INTERACTIONS
LIFETIME
MIXING
MULTIPARTICLE SPECTROMETERS
PARTICLE DECAY
PARTICLE IDENTIFICATION
STANDARD MODEL
UPSILON-10580 MESONS