Determination of the sign of the decay width difference in the bs0 system
The
interference between the K +K - S-wave and P-wave amplitudes in
Bs0→J/ψK +K - decays with the K +K - pairs in the region around the
(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
measurement in Bs0→J/ψ decays, we conclude that the Bs0 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 ΔΓ sΓ L-Γ H to be positive. Our result also resolves
the ambiguity in the past measurements of the CP violating phase s to be
close to zero rather than π. These conclusions are in agreement with
the standard model expectations.
Title:
| Determination of the sign of the decay width difference in the bs0 system | |
| Authors: | Aaij, Roel Abellán Beteta Adametz, Aleksandra , ... |
| Keywords: | Bs0 system CP asymmetries Decay widths Atomic physics The standard model Physics |
| Issue Date: | 2012 |
| Publisher: | CERN, for the LHCb collaboration |
| Abstract: | The interference between the K +K - S-wave and P-wave amplitudes in Bs0→J/ψK +K - decays with the K +K - pairs in the region around the (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 measurement in Bs0→J/ψ decays, we conclude that the Bs0 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 ΔΓ sΓ L-Γ H to be positive. Our result also resolves the ambiguity in the past measurements of the CP violating phase s to be close to zero rather than π. These conclusions are in agreement with the standard model expectations. |
| Description: | Physical Review Letters 108(24),241801 |
| URI: | http://repository.vnu.edu.vn/handle/VNU_123/30035 |
| Appears in Collections: | Bài báo của ĐHQGHN trong Scopus |
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