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論文

Measurement of time-dependent violation in decays

遊佐洋右*; 谷田聖; Belle Collaboration*; 他159名*

Physical Review D, 99(1), p.011102_1 - 011102_7, 2019/01

AA2019-0530.pdf:0.33MB

https://doi.org/10.1103/PhysRevD.99.011102

被引用回数：2 パーセンタイル：13.7(Astronomy & Astrophysics)

We report a measurement of time-dependent violation in decays using a data sample of pairs collected by the Belle experiment running at the resonance at the KEKB collider. This decay proceeds mainly via a "penguin" amplitude. The results are $sin 2phi^{rm eff}_1 = 0.92^{+0.27}_{-0.31}~$ (stat.) (syst.) and (stat.) (syst.), which are the most precise measurements of violation in this decay mode to date. The value for the -violating parameter $sin 2phi^{rm eff}_1$ is consistent with that obtained using decay modes proceeding via a "tree" amplitude.

論文

Observation of and decaying to mesons

Garmash, A.*; 谷田聖; Belle Collaboration*; 他159名*

Physical Review Letters, 116(21), p.212001_1 - 212001_7, 2016/05

AA2016-0341.pdf:0.34MB

https://doi.org/10.1103/PhysRevLett.116.212001

被引用回数：70 パーセンタイル：93.34(Physics, Multidisciplinary)

We report the analysis of the three-body $e^+e^- to Bbar{B}pi^{pm}$ , $Bbar{B}^*pi^{pm}$ , $B^*bar{B}^*pi^{pm}$ processes, including the first observations of the $Z_b(10610) to [Bbar{B}^*+ c.c.]^{pm}$ and $Z_b(10650) to [B^*bar{B}^*]^{pm}$ transitions that are found to dominate the corresponding final states. We measure Born cross sections for the three-body production of $sigma(e^+e^- to [Bbar{B}^*+ c.c.]^{pm}pi^{mp})=[17.4pm 1.6({rm stat.}) pm 1.6({rm syst.})]$ pb and $sigma(e^+e^- to [B^*bar{B}^*]^{pm}pi^{mp})= [8.75 pm 1.15({rm stat.}) pm 1.04({rm syst.})]$ pb and set a 90% C.L. upper limit of $sigma(e^+e^- to [Bbar{B}]^{pm}pi^{mp}) < 2.9$ pb. The results are based on a 121.4 fb $^{-1}$ data sample collected with the Belle detector at a center-of-mass energy near the peak.