First measurements of absolute branching fractions of the $\Xi_c^+$ baryon at Belle

Belle Collaboration,Li Y. B.,Shen C. P.,Adachi I.,Ahn J. K.,Aihara H.,Said S. Al,Asner D. M.,Atmacan H.,Aushev T.,Ayad R.,Babu V.,Bakich A. M.,Ban Y.,Bansal V., Behera P., Bele\{n}o C.,Berger M.,Bhardwaj V.,Bhuyan B.,Bilka T.,Biswal J.,Bobrov A.,Bozek A.,Bračko M., Browder T. E.,Campajola M.,Cao L.,Červenkov D., Chekelian V.,Chen A.,Cheon B. G.,Chilikin K., Cho H. E.,Cho K.,Choi Y.,Choudhury S.,Cinabro D.,Cunliffe S.,Di Carlo S.,Doležal Z.,Dossett D.,Eidelman S.,Epifanov D.,Fast J. E.,Ferber T.,Fulsom B. G.,Garg R.,Gaur V.,Gabyshev N.,Garmash A.,Giri A.,Goldenzweig P.,Grube B.,Grzymkowska O.,Haba J.,Hara T.,Hayasaka K.,Hayashii H., Hou W. -S.,Iijima T.,Inami K.,Inguglia G.,Ishikawa A.,Iwasaki M.,Iwasaki Y.,Jacobs W. W.,Jia S.,Jin Y.,Joffe D.,Joo K. K., Kaliyar A. B.,Karyan G.,Kato Y.,Kawasaki T.,Kichimi H., Kim C. H.,Kim D. Y., Kim H. J.,Kim K. T., Kim S. H.,Kinoshita K.,Kodyš P.,Korpar S.,Kotchetkov D.,Križan P.,Kroeger R.,Krokovny P., Kuhr T.,Kulasiri R.,Kuzmin A.,Kwon Y. -J., Lalwani K.,Lange J. S.,Lee I. S.,Lee J. K.,Lee J. Y.,Lee S. C.,Li C. H.,Li L. K.,Gioi L. Li,Libby J., Lieret K.,Liventsev D., Lu P. -C.,MacNaughton J.,Masuda M.,Matsuda T.,Matvienko D.,Merola M.,Miyabayashi K.,Miyata H.,Mizuk R.,Mohanty G. B.,Moon T. J.,Mussa R.,Nakao M.,Nath K. J.,Nayak M.,Niiyama M., Nisar N. K.,Nishida S., Nishimura K., Ogawa S.,Ono H.,Onuki Y.,Pakhlov P.,Pakhlova G.,Pal B.,Pardi S.,Park H.,Park S. -H.,Patra S.,Paul S.,Pedlar T. K.,Pestotnik R.,Piilonen L. E.,Popov V.,Prencipe E.,Ritter M.,Rostomyan A.,Russo G., Sahoo D.,Sakai Y.,Salehi M.,Santelj L.,Sanuki T.,Savinov V.,Schneider O.,Schnell G.,Schueler J.,Schwanda C.,Seino Y.,Senyo K.,Sevior M. E., Shebalin V.,Shiu J. -G.,Shwartz B.,Simon F., Sokolov A.,Solovieva E.,Starič M., Stottler Z. S.,Strube J. F.,Sumihama M.,Sumiyoshi T.,Takizawa M.,Tamponi U.,Tanida K.,Tenchini F.,Uchida M.,Uglov T.,Unno Y.,Uno S., Ushiroda Y., Vahsen S. E.,Van Tonder R.,Varner G., Vinokurova A.,Wang B.,Wang C. H.,Wang M. -Z.,Wang P., Watanuki S.,Won E.,Yang S. B.,Ye H.,Yelton J.,Yin J. H.,Yuan C. Z.,Yusa Y.,Zhang Z. P.,Zhilich V.,Zhukova V.,Zhulanov V.

PHYSICAL REVIEW D（2019）

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摘要

We present the first measurements of the absolute branching fractions of Xi(+)(c) decays into Xi(-)pi(+)pi(+) and pK(-)pi(+) final states. Our analysis is based on a data set of (772 +/- 11) x 10(6) B (B) over bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. We measure the absolute branching fraction of (B) over bar (0) -> (Lambda) over bar (-)(c)Xi(+)(c) with the Xi(+)(c) recoiling against (Lambda) over bar (- )(c)in (B) over bar (0) decays resulting in B((B) over bar (0) -> (Lambda) over bar (-)(c)Xi(+)(c)) = [1.16 +/- 0.42(stat.) +/- 0.15(syst.)] x 10(-3). We then measure the product branching fractions B((B) over bar (0) -> (Lambda) over bar (-)(c)Xi(+)(c))B(Xi(+)(c) -> Xi(-)pi(+)pi(+)) and B((B) over bar (0) -> (Lambda) over bar (-)(c)Xi(+)(c))B(Xi(+)(c) -> pK(-)pi(+)). Dividing these product branching fractions by (B) over bar (0) -> (Lambda) over bar (-)(c)Xi(+)(c) yields B(Xi(+)(c) -> Xi(-)pi(+)pi(+)) = [2.86 +/- 1.21(stat.) +/- 0.38(syst.)]% and B(Xi(+)(c) -> pK(-)pi(+)) = [0.45 +/- 0.21(stat.) +/- 0.07(syst.)]%. Our result for B(Xi(+)(c) -> Xi(-)pi(+)pi(+)) can be combined with Xi(+)(c) branching fractions measured relative to Xi(+)(c) -> Xi(-)pi(+)pi(+) to set the absolute scale for many Xi(+)(c) branching fractions.

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关键词

Product (mathematics),Branching fraction,Electron–positron annihilation,KEKB,Baryon,Bar (unit),Lambda,Particle physics,Physics

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