Determination of the sign of the decay width difference in the $B^0_s$ system
Determination of the sign of the decay width difference in the $B^0_s$ system
The interference between the $K^+K^-$ S-wave and P-wave amplitudes in $B_s \rightarrow J/\psi K^+K^-$ decays with the $K^+K^-$ pairs in the region around the $\phi(1020)$ resonance is used to determine the variation of the difference of the strong phase between these amplitudes as a function of $K^+K^-$ invariant mass. Combined with the results from our $CP$ asymmetry measurements in the $B_s \rightarrow J/\psi \phi$ decays, we conclude that the $B_s$ mass eigenstate that is almost $CP =+1$ is lighter and decays faster than the mass eigenstate that is almost $CP =-1$. This determines the sign of the decay width difference $\Delta\Gamma_s \equiv \Gamma_L -\Gamma_H$ to be positive. Our result also resolves the ambiguity in the past measurements of the $CP$ violating phase $\phi_s$ to be close to zero rather than $\pi$. These conclusions are in agreement with the Standard Model expectations.
The interference between the K+K- S-wave and P-wave amplitudes in B_s -> J/psi K+K- decays with the K+K- pairs in the region around the phi(1020) resonance is used to determine the variation of the difference of the strong phase between these amplitudes as a function of K+K- invariant mass. Combined with the results from our CP asymmetry measurements in B_s -> J/psi phi decays, we conclude that the B_s mass eigenstate that is almost CP =+1 is lighter and decays faster than the mass eigenstate that is almost CP =-1. This determines the sign of the decay width difference DeltaGamma_s == Gamma_L -Gamma_H to be positive. Our result also resolves the ambiguity in the past measurements of the CP violating phase phi_s to be close to zero rather than pi. These conclusions are in agreement with the Standard Model expectations.
- Federal University of Rio de Janeiro Brazil
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences Russian Federation
- Università di Bologna Italy
- Tsinghua University China (People's Republic of)
- Russian Academy of Sciences Russian Federation
High Energy Physics - Phenomenology, Particle Physics - Experiment, High Energy Physics - Experiment
High Energy Physics - Phenomenology, Particle Physics - Experiment, High Energy Physics - Experiment
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