Observation of B(s)(0) → D(s)(*)+ D(s)(*)- using e+ e- collisions and a determination of the B(s)-B(s) width difference ΔΓ(s)

S 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 Bračko; 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 Doležal; Z Drásal; A Drutskoy; S Eidelman; P Goldenzweig; B Golob; H Ha; J Haba; T 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; H O Kim; J H Kim; Y J Kim; K Kinoshita; B R Ko; P Kodyš; S Korpar; P Križan; P 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; S Nishida; O Nitoh; T Ohshima; S Okuno; S L Olsen; P Pakhlov; C W Park; H Park; H K Park; M Petrič; L E Piilonen; M Röhrken; S Ryu; H Sahoo; Y Sakai; O Schneider; C Schwanda; K Senyo; M E Sevior; M Shapkin; C P Shen; J-G Shiu; P Smerkol; E Solovieva; M Starič; K Sumisawa; T Sumiyoshi; Y Teramoto; K Trabelsi; S Uehara; Y Unno; S Uno; P 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; Belle Collaboration

doi:10.1103/PhysRevLett.105.201802

Observation of B(s)(0) → D(s)()+ D(s)()- using e+ e- collisions and a determination of the B(s)-B(s) width difference ΔΓ(s)

Phys Rev Lett. 2010 Nov 12;105(20):201802. doi: 10.1103/PhysRevLett.105.201802. Epub 2010 Nov 10.

Authors

S Esen¹, 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 Bračko, 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 Doležal, Z Drásal, A Drutskoy, S Eidelman, P Goldenzweig, B Golob, H Ha, J Haba, T 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, H O Kim, J H Kim, Y J Kim, K Kinoshita, B R Ko, P Kodyš, S Korpar, P Križan, P 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, S Nishida, O Nitoh, T Ohshima, S Okuno, S L Olsen, P Pakhlov, C W Park, H Park, H K Park, M Petrič, L E Piilonen, M Röhrken, S Ryu, H Sahoo, Y Sakai, O Schneider, C Schwanda, K Senyo, M E Sevior, M Shapkin, C P Shen, J-G Shiu, P Smerkol, E Solovieva, M Starič, K Sumisawa, T Sumiyoshi, Y Teramoto, K Trabelsi, S Uehara, Y Unno, S Uno, P 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; Belle Collaboration

Affiliation

¹ University of Cincinnati, Cincinnati, Ohio 45221, USA.

PMID: 21231220
DOI: 10.1103/PhysRevLett.105.201802

Abstract

We have made the first observation of B(s)(0)→D(s)(*)+ D(s)(*)- 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(B(s)(0)→D(s)+ D(s)-)=(1.03(-0.32-0.25)(+0.39+0.26))%, B(B(s)(0)→D(s)(*±) D(s)(∓))=(2.75(-0.71)(+0.83)±0.69)%, and B(B(s)(0)→D(s)*+ D(s)*-)=(3.08(-1.04-0.86)(+1.22+0.85))%; the sum is B[B(s)(0)→D(s)(*)+ D(s)(*)-]=(6.85(-1.30-1.80)(+1.53+1.79))%. Assuming B(s)(0)→D(s)(*)+ D(s)(*)- saturates decays to CP-even final states, the branching fraction determines the ratio ΔΓ(s)/cosφ, where ΔΓ(s) is the difference in widths between the two B(s)-B(s) mass eigenstates, and φ is a CP-violating weak phase. Taking CP violation to be negligibly small, we obtain ΔΓ(s)/Γ(s)=0.147(-0.030)(+0.036)(stat)(-0.041)(+0.042)(syst), where Γ(s) is the mean decay width.