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Measurement of the CP violating phase \phi_s in Bs->J/\psi f0(980)

Abstract : Measurement of mixing-induced CP violation in Bs decays is of prime importance in probing new physics. So far only the channel Bs->J/\psi \phi\ has been used. Here we report on a measurement using an LHCb data sample of 0.41/fb in the CP odd eigenstate J\psi f0(980), where f0(980)->\pi+ \pi-. A time dependent fit of the data with the Bs lifetime and the difference in widths of the heavy and light eigenstates constrained to the values obtained from Bs-> J/\psi\phi\ yields a value of the CP violating phase of -0.44 +/- 0.44 +/- 0.02 rad, consistent with the Standard Model expectation.
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http://hal.in2p3.fr/in2p3-00653539
Contributor : Claudine Bombar <>
Submitted on : Monday, December 19, 2011 - 4:34:23 PM
Last modification on : Friday, November 20, 2020 - 3:30:13 PM

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R. Aaij, L. Arrabito, I. de Bonis, D. Decamp, Ph. Ghez, et al.. Measurement of the CP violating phase \phi_s in Bs->J/\psi f0(980). Physics Letters B, Elsevier, 2012, 707, pp.497-505. ⟨10.1016/j.physletb.2012.01.017⟩. ⟨in2p3-00653539⟩

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