First Measurement of Inclusive B -> X_s eta Decays

A.Bondar; A.Bozek; A.Chen; A.Drutskoy; A.J.Schwartz; A.Kuzmin; A.Matyja; A.M.Bakich; A.Sokolov; A.Zupanc

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First Measurement of Inclusive B -> X_s eta Decays

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arxiv 0910.4751 v2 pith:AFGDYIKJ submitted 2009-10-25 hep-ex

First Measurement of Inclusive B -> X_s eta Decays

Belle Collaboration: K.Nishimura , T.E.Browder , I.Adachi , H.Aihara , K.Arinstein , T.Aushev , A.M.Bakich , V.Balagura

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E.Barberio K.Belous V.Bhardwaj M.Bischofberger A.Bondar A.Bozek M.Bracko M.-C.Chang Y.Chao A.Chen K.-F.Chen P.Chen B.G.Cheon C.-C.Chiang I.-S.Cho Y.Choi J.Dalseno M.Danilov Z.Dolezal A.Drutskoy S.Eidelman N.Gabyshev B.Golob H.Ha J.Haba T.Hara K.Hayasaka H.Hayashii Y.Horii Y.Hoshi W.-S.Hou H.J.Hyun T.Iijima K.Inami R.Itoh M.Iwabuchi Y.Iwasaki N.J.Joshi T.Julius J.H.Kang P.Kapusta H.Kawai T.Kawasaki H.Kichimi C.Kiesling H.J.Kim H.O.Kim M.J.Kim Y.J.Kim K.Kinoshita B.R.Ko P.Kodys S.Korpar P.Krizan T.Kumita A.Kuzmin Y.-J.Kwon S.-H.Kyeong J.S.Lange M.J.Lee S.-H.Lee J.Li C.Liu Y.Liu D.Liventsev R.Louvot A.Matyja S.McOnie K.Miyabayashi H.Miyata Y.Miyazaki G.B.Mohanty T.Mori E.Nakano M.Nakao Z.Natkaniec S.Nishida S.Ogawa T.Ohshima S.L.Olsen W.Ostrowicz G.Pakhlova C.W.Park H.Park H.K.Park K.S.Park R.Pestotnik M.Petric L.E.Piilonen M.Rohrken S.Ryu H.Sahoo Y.Sakai O.Schneider C.Schwanda A.J.Schwartz K.Senyo O.Seon M.E.Sevior M.Shapkin C.P.Shen J.-G.Shiu F.Simon P.Smerkol A.Sokolov E.Solovieva M.Staric T.Sumiyoshi S.Suzuki Y.Teramoto K.Trabelsi S.Uehara T.Uglov Y.Unno S.Uno G.Varner K.E.Varvell K.Vervink C.H.Wang M.-Z.Wang P.Wang Y.Watanabe J.Wicht K.M.Williams E.Won Y.Yamashita M.Yamauchi C.C.Zhang Z.P.Zhang P.Zhou V.Zhulanov T.Zivko A.Zupanc O.Zyukova

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We report a first measurement of inclusive B -> X_s eta decays, where X_s is a charmless state with unit strangeness. The measurement is based on a pseudo-inclusive reconstruction technique and uses a sample of 657 x 10^6 BB-bar pairs accumulated with the Belle detector at the KEKB e^+e^- collider. For M_{X_s} < 2.6 GeV/c^2, we measure a branching fraction of (26.1 +/- 3.0 (stat) +1.9 -2.1 (syst) +4.0 -7.1 (model)) x 10^-5 and a direct CP asymmetry of A_{CP} = -0.13 +/- 0.04 +0.02 -0.03. Over half of the signal occurs in the range M_{X_s} > 1.8 GeV/c^2.

First Measurement of Inclusive B -> X_s eta Decays

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