We present a study of the inclusive D*(+/-) production in the decay of Y(1S) using (98.6 +/- 0.9) X 10(6) Y(2S) mesons collected with the BABAR detector at the Y(2S) resonance. Using the decay chain Y(2S) -> pi(+)pi(-)Y(1S), Y(1S) -> D*(+/-)X, where X is unobserved, we measure the branching fraction B[Y(1S) -> D*(+/-)X] = (2.52 +/- 0.13(stat) +/- 0.15(syst)% and the D*(+/-) momentum distribution in the rest frame of the Y(1S). We find evidence for an excess of D*+/- production over the expected rate from the virtual photon annihilation process Y(1S) -> gamma* -> c (c) over bar -> D*(+/-)X.
Observation of inclusive D*(+/-) production in the decay of Y(1S)
ANGELINI, CARLO;BATIGNANI, GIOVANNI;BETTARINI, STEFANO;CALDERINI, GIOVANNI;CERVELLI, ALBERTO;FORTI, FRANCESCO;GIORGI, MARCELLO;NERI, NICOLA;PAOLONI, EUGENIO;RIZZO, GIULIANA;
2010-01-01
Abstract
We present a study of the inclusive D*(+/-) production in the decay of Y(1S) using (98.6 +/- 0.9) X 10(6) Y(2S) mesons collected with the BABAR detector at the Y(2S) resonance. Using the decay chain Y(2S) -> pi(+)pi(-)Y(1S), Y(1S) -> D*(+/-)X, where X is unobserved, we measure the branching fraction B[Y(1S) -> D*(+/-)X] = (2.52 +/- 0.13(stat) +/- 0.15(syst)% and the D*(+/-) momentum distribution in the rest frame of the Y(1S). We find evidence for an excess of D*+/- production over the expected rate from the virtual photon annihilation process Y(1S) -> gamma* -> c (c) over bar -> D*(+/-)X.File in questo prodotto:
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