Measuring the CP Violating Phase in Bs Mixing Using Bs -> J/ψf_0(980)

Abstract

We show that the decay Bs -> J/psi f0(980), f0(980)->pi+ pi- can be used to measure the CP violating phase in Bs mixing, -2β_s, and estimate the sensitivity as +/- 0.050 rad, for 2/fb of LHCb data. After adding in the related Bs -> J/psi eta', η' -> rho gamma mode, the sensitivity improves to +/- 0.044 rad. Use of these CP eigenstates obviates the need for a transversity analysis that must be used in the case of Bs -> J/psi phi decays.

30 pages 22 figures