Observation ofBs0→Ds(*)+Ds(*)−Usinge+e−Collisions and a Determination of theBs−B¯sWidth DifferenceΔΓs

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2010
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Abstract
We have made the first observation of Bs0→Ds(*)+Ds(*)− decays using 23.6 fb−1 of data recorded by the Belle experiment running on the Υ(5S) resonance. The branching fractions are measured to be B(Bs0→Ds+Ds−)=(1.03−0.32−0.25+0.39+0.26)%, B(Bs0→Ds*±Ds∓)=(2.75−0.71+0.83±0.69)%, and B(Bs0→Ds*+Ds*−)=(3.08−1.04−0.86+1.22+0.85)%; the sum is B[Bs0→Ds(*)+Ds(*)−]=(6.85−1.30−1.80+1.53+1.79)%. Assuming Bs0→Ds(*)+Ds(*)− saturates decays to CP-even final states, the branching fraction determines the ratio ΔΓs/cosφ, where ΔΓs is the difference in widths between the two Bs−B¯s mass eigenstates, and φ is a CP-violating weak phase. Taking CP violation to be negligibly small, we obtain ΔΓs/Γs=0.147−0.030+0.036(stat)−0.041+0.042(syst), where Γs is the mean decay width.
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Authors Sevda Esen,A. J. Schwartz,I. Adachi,H. Aihara,K. Arinstein,V. Aulchenko,T. Aushev,T. Aziz,A. M. Bakich,V. Balagura,E. Barberio,A. Bay,M. Bischofberger,A. Bondar,A. Bozek,M. Bracko,T. E. Browder,M.-C. Chang,P. Chang,A. Chen,P. Chen,B. G. Cheon,C.-C. Chiang,Y. Choi,J. Dalseno,M. Dash,Z. Dolezal,Z. Drásal,A. Drutskoy,S. Eidelman,P. Goldenzweig,B. Golob,H. Ha,J. Haba,Takanori Hara,K. Hayasaka,T. Higuchi,Y. Hoshi,W.-S. Hou,Y. B. Hsiung,H. J. Hyun,T. Iijima,K. Inami,R. Itoh,M. Iwabuchi,N. J. Joshi,T. Julius,J. H. Kang,T. Kawasaki,H. Kichimi,H. J. Kim,J. H. Kim,Y. J. Kim,K. Kinoshita,B. R. Ko,Peter Kodyš,S. Korpar,Peter Križan,Pavel Krokovny,T. Kuhr,T. Kumita,Y.-J. Kwon,S.-H. Kyeong,J. S. Lange,S.-H. Lee,Y. Liu,D. Liventsev,R. Louvot,A. Matyja,S. McOnie,H. Miyata,R. Mizuk,G. B. Mohanty,E. Nakano,M. Nakao,H. Nakazawa,Z. Natkaniec,S. Neubauer,Shohei Nishida,O. Nitoh,T. Ohshima,S. Okuno,S. L. Olsen,Pavel Pakhlov,C. W. Park,H. K. Park,M. Petric,L. E. Piilonen,M. Röhrken,S. Ryu,H. Sahoo,Y. Sakai,O. Schneider,C. Schwanda,K. Senyo,Martin Sevior,M. Shapkin,C. P. Shen,J.-G. Shiu,P. Smerkol,Elena Solovieva,M. Starič,K. Sumisawa,T. Sumiyoshi,Y. Teramoto,Karim Trabelsi,S. Uehara,Y. Unno,S. Uno,Phillip Urquijo,Y. Usov,G. Varner,K. E. Varvell,K. Vervink,C. H. Wang,M.-Z. Wang,P. Wang,Y. Watanabe,R. Wedd,J. Wicht,E. Won,B. D. Yabsley,Y. Yamashita,Z. P. Zhang,V. Zhilich,A. Zupanc;Sevda Esen;A. J. Schwartz;I. Adachi;H. Aihara;K. Arinstein;V. Aulchenko;T. Aushev;T. Aziz;A. M. Bakich;V. Balagura;E. Barberio;A. Bay;M. Bischofberger;A. Bondar;A. Bozek;M. Bracko;T. E. Browder;M.-C. Chang;P. Chang;A. Chen;P. Chen;B. G. Cheon;C.-C. Chiang;Y. Choi;J. Dalseno;M. Dash;Z. Dolezal;Z. Drásal;A. Drutskoy;S. Eidelman;P. Goldenzweig;B. Golob;H. Ha;J. Haba;Takanori Hara;K. Hayasaka;T. Higuchi;Y. Hoshi;W.-S. Hou;Y. B. Hsiung;H. J. Hyun;T. Iijima;K. Inami;R. Itoh;M. Iwabuchi;N. J. Joshi;T. Julius;J. H. Kang;T. Kawasaki;H. Kichimi;H. J. Kim;J. H. Kim;Y. J. Kim;K. Kinoshita;B. R. Ko;Peter Kodyš;S. Korpar;Peter Križan;Pavel Krokovny;T. Kuhr;T. Kumita;Y.-J. Kwon;S.-H. Kyeong;J. S. Lange;S.-H. Lee;Y. Liu;D. Liventsev;R. Louvot;A. Matyja;S. McOnie;H. Miyata;R. Mizuk;G. B. Mohanty;E. Nakano;M. Nakao;H. Nakazawa;Z. Natkaniec;S. Neubauer;Shohei Nishida;O. Nitoh;T. Ohshima;S. Okuno;S. L. Olsen;Pavel Pakhlov;C. W. Park;H. K. Park;M. Petric;L. E. Piilonen;M. Röhrken;S. Ryu;H. Sahoo;Y. Sakai;O. Schneider;C. Schwanda;K. Senyo;Martin Sevior;M. Shapkin;C. P. Shen;J.-G. Shiu;P. Smerkol;Elena Solovieva;M. Starič;K. Sumisawa;T. Sumiyoshi;Y. Teramoto;Karim Trabelsi;S. Uehara;Y. Unno;S. Uno;Phillip Urquijo;Y. Usov;G. Varner;K. E. Varvell;K. Vervink;C. H. Wang;M.-Z. Wang;P. Wang;Y. Watanabe;R. Wedd;J. Wicht;E. Won;B. D. Yabsley;Y. Yamashita;Z. P. Zhang;V. Zhilich;A. Zupanc;
Journal physical review letters
Year 2010
DOI 10.1103/physrevlett.105.201802
URL
https://sciprofiles.com/publication/view/3239d2752430865a7743dfc4266324f8
Keywords
branching fractions bs0 cp violating decays using belle experiment experiment running

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