Measurements of CP-Violating Asymmetries in B0 -> a1+-(1260) pi-+ Decays

B Aubert, Pablo Del Amo Sanchez, Matthew Barrett, Theresa Harrison, Alistair Hart, Christopher Hawkes, Alan Watson

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We present measurements of CP-violating asymmetries in the decay B(0)-->a(1)(+/-)(1260)pi(-/+) with a(1)(+/-)(1260)-->pi(-/+)pi(+/-)pi(+/-). The data sample corresponds to 384x10(6) BB[over ] pairs collected with the BABAR detector at the PEP-II asymmetric B factory at SLAC. We measure the CP-violating asymmetry A(CP)(a(1)pi)=-0.07+/-0.07+/-0.02, the mixing-induced CP violation parameter S(a(1)pi)=0.37+/-0.21+/-0.07, the direct CP violation parameter C(a(1)pi)=-0.10+/-0.15+/-0.09, and the parameters DeltaC(a(1)pi)=0.26+/-0.15+/-0.07 and DeltaS(a(1)pi)=-0.14+/-0.21+/-0.06. From these measured quantities we determine the angle alpha(eff)=78.6 degrees +/-7.3 degrees.
Original languageEnglish
Pages (from-to)181803
Number of pages1
JournalPhysical Review Letters
Early online date1 May 2007
Publication statusPublished - 1 May 2007


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