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Study of high momentum eta' production in B --> eta'Xs.

Research paper by B B Aubert, R R Barate, D D Boutigny, F F Couderc, J-M JM Gaillard, A A Hicheur, Y Y Karyotakis, J P JP Lees, V V Tisserand, A A Zghiche, A A Palano, A A Pompili, J C JC Chen, N D ND Qi, G G Rong, et al.

Indexed on: 25 Aug '04Published on: 25 Aug '04Published in: Physical review letters



Abstract

We measure the branching fraction for the charmless semi-inclusive process B --> eta'Xs, where the eta' meson has a momentum in the range 2.0 to 2.7 GeV/c in the upsilon4S center-of-mass frame and Xs represents a system comprising a kaon and zero to four pions. We find B(B --> eta'Xs) = [3.9 +/- 0.8(stat) +/- 0.5(syst) +/- 0.8(model)] x 10(-4). We also obtain the Xs mass spectrum and find that it fits models predicting high masses.