Measurement of branching fraction and time-dependent CP asymmetry parameters in B{sup 0}{yields}D*{sup +}D*{sup -}K{sub S}{sup 0} decays

Journal Article · Mon Oct 01 00:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.76.072004· OSTI ID:21032305

Dalseno, J; Moloney, G R; Sevior, M E; Taylor, G N; Urquijo, P; Wedd, R ^[1]; Adachi, I; Hazumi, M; Iwasaki, Y; Katayama, N; Kichimi, H; Krokovny, P; Limosani, A; Nakao, M; Nishida, S; Ozaki, H; Sakai, Y; Schuemann, J; Sumisawa, K; Takasaki, F ^[2]

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1. University of Melbourne, School of Physics, Victoria 3010 (Australia)
2. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)

We present a measurement of the branching fraction and time-dependent CP violation parameters for B{sup 0}{yields}D*{sup +}D*{sup -}K{sub S}{sup 0} decays. These results are obtained from a 414 fb{sup -1} data sample that contains 449x10{sup 6} BB pairs collected at the {upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. We obtain the branching fraction, B(B{sup 0}{yields}D*{sup +}D*{sup -}K{sub S}{sup 0})=[3.4{+-}0.4(stat){+-}0.7(syst)]x10{sup -3}, which is in agreement with the current world average. We also obtain an upper limit on the product branching fraction for a possible two-body decay, B(B{sup 0}{yields}D{sub s1}{sup +}(2536)D*{sup -})B(D{sub s1}{sup +}(2536){yields}D*{sup +}K{sub S}{sup 0})<7.1x10{sup -4} (90% CL). In the traditional 2-parameter time-dependent CP analysis, we measure the CP violation parameters, A{sub CP}=-0.01{sub -0.28}{sup +0.28}(stat){+-}0.09(syst), Dsin2{phi}{sub 1}=0.06{sub -0.44}{sup +0.45}(stat){+-}0.06(syst). No evidence for either mixing-induced or direct CP violation is found. In a 3-parameter fit sensitive to cos2{phi}{sub 1} performed in the half-Dalitz spaces, s{sup -}{<=}s{sup +} and s{sup -}>s{sup +}, where s{sup {+-}}{identical_to}m{sup 2}(D*{sup {+-}}K{sub S}{sup 0}), we extract the CP violation parameters, J{sub c}/J{sub 0}=0.60{sub -0.28}{sup +0.25}(stat){+-}0.08(syst), 2J{sub s1}/J{sub 0}sin2{phi}{sub 1}=-0.17{sub -0.42}{sup +0.42}(stat){+-}0.09(syst), 2J{sub s2}/J{sub 0}cos2{phi}{sub 1}=-0.23{sub -0.41}{sup +0.43}(stat){+-}0.13(syst). A large value of J{sub c}/J{sub 0} would indicate a significant resonant contribution from a broad unknown D{sub s}**{sup +} state. Although the sign of the factor, 2J{sub s2}/J{sub 0}, can be deduced from theory, no conclusion can be drawn regarding the sign of cos2{phi}{sub 1} given the errors.

• OSTI ID: 21032305
• Journal Information: Physical Review. D, Particles Fields, Vol. 76, Issue 7; Other Information: DOI: 10.1103/PhysRevD.76.072004; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). Belle Collaboration; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B NEUTRAL MESONS
BRANCHING RATIO
CP INVARIANCE
CRITICAL CURRENT
CURRENT DENSITY
D S MESONS
D*-2010 MESONS
ELECTRON-POSITRON INTERACTIONS
ELECTRONS
ERRORS
HADRONIC PARTICLE DECAY
KAONS NEUTRAL SHORT-LIVED
MULTIPARTICLE SPECTROMETERS
MULTIPLE PRODUCTION
PARTICLE IDENTIFICATION
POSITRONS
TIME DEPENDENCE
TWO-BODY PROBLEM