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  4. Vidence for CP-violating asymmetries in B0→π +π- decays and constraints on the CKM angle φ2
 
research article

Vidence for CP-violating asymmetries in B0→π +π- decays and constraints on the CKM angle φ2

Abe, K.
•
Abe, N.
•
Abe, T.
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2003
Physical Review D [1970-2015]

We present an improved measurement of CP-violating asymmetries in B 0→π+π- decays based on a 78 fb -1 data sample collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider. We reconstruct one neutral B meson as a B0→π+π - CP eigenstate and identify the flavor of the accompanying B meson from inclusive properties of its decay products. We apply an unbinned maximum likelihood fit to the distribution of the time intervals between the two B meson decay points. The fit yields the CP-violating asymmetry amplitudes A ππ= +0.77 ±0.27(stat) ±0.08(syst) and S ππ=-1.23 ±0.41(stat) -0.07 +0.08(syst), where the statistical uncertainties are determined from the Monte Carlo pseudoexperiments. We obtain confidence intervals for CP-violating asymmetry parameters Aππ and Sππ based on a frequentist approach. We rule out the CP-conserving case, A ππ=Sππ=0, at the 99.93% confidence level. We discuss how these results constrain the value of the Cabibbo-Kobayashi-Maskawa (CKM) angle φ2. © 2003 The American Physical Society.

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Type
research article
DOI
10.1103/PhysRevD.68.012001
Scopus ID

2-s2.0-33751180546

Author(s)
Abe, K.
Abe, N.
Abe, T.
Adachi, I.
Aihara, H.
Akai, K.
Akatsu, M.
Akemoto, M.
Asano, Y.
Aushev, T.
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Date Issued

2003

Publisher

American Physical Society

Published in
Physical Review D [1970-2015]
Volume

68

Issue

1

Article Number

012001

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPHE  
Available on Infoscience
November 5, 2010
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/56813
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