I. Nakamura
University of Tokyo
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Featured researches published by I. Nakamura.
Physical Review Letters | 2005
I. Bizjak; K. Abe; H. Aihara; Y. Asano; S. Bahinipati; A. M. Bakich; Y. Ban; E. Barberio; M. Barbero; A. Bay; U. Bitenc; S. Blyth; A. Bondar; A. Bozek; M. Bračko; J. Brodzicka; T. E. Browder; Y. Chao; A. Chen; W.T. Chen; B. G. Cheon; R. Chistov; S.-K. Choi; Y. Choi; Y. K. Choi; A. Chuvikov; S. Cole; J. Dalseno; M. Danilov; M. Dash
We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element /Vub/, based on 253 fb(-1) of data collected by the Belle detector at the KEKB e+ e- asymmetric collider. Events are tagged by fully reconstructing one of the B mesons, produced in pairs from Gamma(4S). The signal for b --> u semileptonic decay is distinguished from the b --> c background using the hadronic mass Mx, the leptonic invariant mass squared q2 and the variable P+ [triple bond] Ex - /px/. The results are obtained for events with p(l)* > or = 1 GeV/c, in three kinematic regions (1) Mx < 1.7 GeV/c2, (2) Mx < 1.7 GeV/c2 combined with q2 > 8 GeV2/c2, and by (3) P+ < 0.66 GeV/c. The matrix element /Vub/ is found to be (4.09 +/- 0.19 +/- 0.20(+0.14) -0.15 +/- 0.18) x 10(-3), where the errors are statistical, systematic including Monte Carlo modeling, theoretical, and from shape function parameter determination, respectively.
arXiv: Instrumentation and Detectors | 2018
V. Izzo; A. Aloisio; F. Ameli; A. Anastasio; P. Branchini; F. Di Capua; R. Giordano; A. Kuzmin; K. Miyabayashi; I. Nakamura; Michiyasu Nakao; G. Tortone; S. Uehara
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