Measurement of |Vub| near the endpoint of the electron momentum spectrum from semileptonic B-meson decays
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Measurement of |Vub| near the endpoint of the electron momentum spectrum from semileptonic B-meson decays

A. Limosani,K. Abe,I. Adachi,Hiroaki Aihara,Y. Asano,T. Aushev,S. Bahinipati,A.M. Bakich,Elisabetta Barberio,U. Bitenc,I. Bizjak,S. Blyth,A. Bondar,Andrzej Bożek,M. Bračko,Jolanta Brodzicka,T.E. Browder,Y. Chao,A. Chen,Kai-Feng Chen,W.T. Chen,B.G. Cheon,R. Chistov,Y. Choi,A. Chuvikov,S. Cole,Jeremy Dalseno,M. Danilov,M. Dash,J. Dragic,A. Drutskoy,S. Eidelman,S. Fratina,N. Gabyshev,T. Gershon,G. Gokhroo,B. Golob,A. Gorišek,Takanori Hara,N.C. Hastings,K. Hayasaka,H. Hayashii,M. Hazumi,L. Hinz,T. Hokuue,Y. Hoshi,S. Hou,W.-S. Hou,T. Iijima,A. Imoto,K. Inami,Akimasa Ishikawa,R. Itoh,Masako Iwasaki,J.H. Kang,N. Katayama,H. Kawai,T. Kawasaki,H.R. Khan,H. Kichimi,H.J. Kim,S.K. Kim,K. Kinoshita,S. Korpar,Pavel Krokovny,R. Kulasiri,S. Kumar,C.C. Kuo,Y.-J. Kwon,J.S. Lange,G. Leder,Tadeusz Lesiak,J. Li,S.-W. Lin,D. Liventsev,J. MacNaughton,G. Majumder,F. Mandl,T. Matsumoto,Y. Mikami,W. Mitaroff,K. Miyabayashi,H. Miyake,H. Miyata,R. Mizuk,D. Mohapatra,T. Mori,T. Nagamine,Y. Nagasaka,E. Nakano,M. Nakao,Z. Natkaniec,Shohei Nishida,O. Nitoh,T. Nozaki,S. Ogawa,T. Ohshima,T. Okabe,S. Okuno,S.L. Olsen,Y. Onuki,W. Ostrowicz,H. Ozaki,H. Palka,C.W. Park,H. Park,N. Parslow,R. Pestotnik,Leo Piilonen,F.J. Ronga,H. Sagawa,Y. Sakai,N. Sato,T. Schietinger,Olivier Schneider,C. Schwanda,R. Seuster,M.E. Sevior,H. Shibuya,B. Shwartz,V. Sidorov,A. Somov,R. Stamen,S. Stanič,M. Starič,K. Sumisawa,Takayuki Sumiyoshi,S.Y. Suzuki,O. Tajima,F. Takasaki,K. Tamai,N. Tamura,M. Tanaka,Y. Teramoto,X.C. Tian,T. Tsukamoto,S. Uehara,K. Ueno,T. Uglov,S. Uno,Phillip Urquijo,G. Varner,K.E. Varvell,S. Villa,C.C. Wang,M.-Z. Wang,Q.L. Xie,Bruce Yabsley,A. Yamaguchi,H. Yamamoto,Y. Yamashita,M. Yamauchi,J. Ying,J. Zhang,L.M. Zhang,Z.P. Zhang,D. Žontar;A. Limosani;K. Abe;I. Adachi;Hiroaki Aihara;Y. Asano;T. Aushev;S. Bahinipati;A.M. Bakich;Elisabetta Barberio;U. Bitenc;I. Bizjak;S. Blyth;A. Bondar;Andrzej Bożek;M. Bračko;Jolanta Brodzicka;T.E. Browder;Y. Chao;A. Chen;Kai-Feng Chen;W.T. Chen;B.G. Cheon;R. Chistov;Y. Choi;A. Chuvikov;S. Cole;Jeremy Dalseno;M. Danilov;M. Dash;J. Dragic;A. Drutskoy;S. Eidelman;S. Fratina;N. Gabyshev;T. Gershon;G. Gokhroo;B. Golob;A. Gorišek;Takanori Hara;N.C. Hastings;K. Hayasaka;H. Hayashii;M. Hazumi;L. Hinz;T. Hokuue;Y. Hoshi;S. Hou;W.-S. Hou;T. Iijima;A. Imoto;K. Inami;Akimasa Ishikawa;R. Itoh;Masako Iwasaki;J.H. Kang;N. Katayama;H. Kawai;T. Kawasaki;H.R. Khan;H. Kichimi;H.J. Kim;S.K. Kim;K. Kinoshita;S. Korpar;Pavel Krokovny;R. Kulasiri;S. Kumar;C.C. Kuo;Y.-J. Kwon;J.S. Lange;G. Leder;Tadeusz Lesiak;J. Li;S.-W. Lin;D. Liventsev;J. MacNaughton;G. Majumder;F. Mandl;T. Matsumoto;Y. Mikami;W. Mitaroff;K. Miyabayashi;H. Miyake;H. Miyata;R. Mizuk;D. Mohapatra;T. Mori;T. Nagamine;Y. Nagasaka;E. Nakano;M. Nakao;Z. Natkaniec;Shohei Nishida;O. Nitoh;T. Nozaki;S. Ogawa;T. Ohshima;T. Okabe;S. Okuno;S.L. Olsen;Y. Onuki;W. Ostrowicz;H. Ozaki;H. Palka;C.W. Park;H. Park;N. Parslow;R. Pestotnik;Leo Piilonen;F.J. Ronga;H. Sagawa;Y. Sakai;N. Sato;T. Schietinger;Olivier Schneider;C. Schwanda;R. Seuster;M.E. Sevior;H. Shibuya;B. Shwartz;V. Sidorov;A. Somov;R. Stamen;S. Stanič;M. Starič;K. Sumisawa;Takayuki Sumiyoshi;S.Y. Suzuki;O. Tajima;F. Takasaki;K. Tamai;N. Tamura;M. Tanaka;Y. Teramoto;X.C. Tian;T. Tsukamoto;S. Uehara;K. Ueno;T. Uglov;S. Uno;Phillip Urquijo;G. Varner;K.E. Varvell;S. Villa;C.C. Wang;M.-Z. Wang;Q.L. Xie;Bruce Yabsley;A. Yamaguchi;H. Yamamoto;Y. Yamashita;M. Yamauchi;J. Ying;J. Zhang;L.M. Zhang;Z.P. Zhang;D. Žontar;
physics letters b 2005 Vol. 621 pp. 28-40
158
Žontar2005physicsmeasurement

Abstract

We report measurements of partial branching fractions of inclusive charmless semileptonic B-meson decays at the endpoint of the electron momentum spectrum. The measurements are made in six overlapping momentum intervals that have lower bounds ranging from 1.9 to 2.4 GeV/c and a common upper bound of 2.6 GeV/c, as measured in the centre of mass frame. The results are based on a sample of 29 million BB¯ pairs, accumulated by the Belle detector at the KEKB asymmetric e+e− collider operating on the ϒ(4S) resonance. In the momentum interval ranging from 1.9 to 2.6 GeV/c we measure the partial branching fraction ΔB(B→Xueνe)=(8.47±0.37±1.53)×10−4, where the first error is statistical and the second is systematic. A prediction of the partial rate R=(21.69±3.62−1.98+2.18)|Vub|2ps−1 in this momentum interval based on theory is calculated with input HQET parameters that have been derived from Belle's measurement of the B→Xsγ photon energy spectrum, where the first error is due to the uncertainty on HQET parameters and the second error is from theory. Using both ΔB(B→Xueνe) and R we find |Vub|=(5.08±0.47±0.42−0.23+0.26)×10−3, where the first error is from the partial branching fraction, and the second and third errors are from uncertainties in R.

Keywords

semileptonic b-meson decays ckm matrix

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DOI:
10.1016/j.physletb.2005.06.011
URL:
https://sciprofiles.com/publication/view/29b15050b...

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