Evidence for direct CP violation in the decay B{sup {+-}{yields}D(*)}K{sup {+-}}, D{yields}K{sub S}{sup 0{pi}+{pi}-} and measurement of the CKM phase {phi}{sub 3}

Journal Article · Tue Jun 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.112002· OSTI ID:21407935

Poluektov, A; Bondar, A; Arinstein, K; Aulchenko, V; Eidelman, S; Epifanov, D; Gabyshev, N; Garmash, A; Kuzmin, A; Shebalin, V; Shwartz, B; Usov, Y; Vinokurova, A; Zhilich, V; Zhulanov, V; Zyukova, O ^[1]; Yabsley, B D; Bakich, A M; McOnie, S; Varvell, K E ^[2]

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1. Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation)
2. School of Physics, University of Sydney, NSW 2006 (Australia)

We present a new measurement of the unitarity triangle angle {phi}{sub 3} using a Dalitz plot analysis of the K{sub S}{sup 0{pi}+{pi}-} decay of the neutral D meson produced in B{sup {+-}{yields}D(*)}K{sup {+-}} decays. The method exploits the interference between D{sup 0} and D{sup 0} to extract the angle {phi}{sub 3}, strong phase {delta}, and the ratio r of suppressed and allowed amplitudes. We apply this method to a 605 fb{sup -1} data sample collected by the Belle experiment. The analysis uses three decays: B{sup {+-}{yields}D}K{sup {+-}}, and B{sup {+-}{yields}D}*K{sup {+-}}with D*{yields}D{pi}{sup 0} and D*{yields}D{gamma}, as well as the corresponding charge-conjugate modes. From a combined maximum likelihood fit to the three modes, we obtain {phi}{sub 3}=78.4 deg. (+10.8 deg./-11.6 deg.){+-}3.6 deg. (syst){+-}8.9 deg. (model). CP conservation in this process is ruled out at the confidence level (1-CL)=5x10{sup -4}, or 3.5 standard deviations.

• OSTI ID: 21407935
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 11; Other Information: DOI: 10.1103/PhysRevD.81.112002; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
B MINUS MESONS
B PLUS MESONS
CP INVARIANCE
D MESONS
D NEUTRAL MESONS
DALITZ PLOT
DEUTERIUM IONS
INTERFERENCE
KAONS MINUS
KAONS PLUS
MAXIMUM-LIKELIHOOD FIT
PARTICLE DECAY
PIONS MINUS
PIONS PLUS
B MESONS
BEAUTY MESONS
BEAUTY PARTICLES
BOSONS
CHARGED PARTICLES
CHARM PARTICLES
CHARMED MESONS
DECAY
DIAGRAMS
ELEMENTARY PARTICLES
HADRONS
INFORMATION
INVARIANCE PRINCIPLES
IONS
KAONS
MATHEMATICAL SOLUTIONS
MESONS
NUMERICAL SOLUTION
PIONS
PSEUDOSCALAR MESONS
SCATTERPLOTS
STRANGE MESONS
STRANGE PARTICLES