Invariant-mass distribution of cc-bar in Upsilon(1S) -> cc-bar + X

Details Invariant-mass distribution of cc-bar in Upsilon(1S) -> cc-bar + X Invariant-mass distribution of cc-bar in Upsilon(1S) -> cc-bar + X

2008-05-14

arxiv.org/abs/0805.1989v1

Phys.Rev.D78:114027,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 1 figure

Scientific paper

10.1103/PhysRevD.78.114027

We calculate the invariant-mass distribution for the cc-bar pair produced in the inclusive Upsilon(1S) decay based on the color-singlet mechanism of the nonrelativistic quantum chromodynamics factorization approach at leading order in the bottom-quark velocity v_b in the meson rest frame. As the short-distance processes, we consider bb-bar -> g^*gg followed by g^* -> cc-bar and bb-bar -> gamma^* -> cc-bar at leading order in the strong coupling. The invariant-mass distribution of the bb-bar -> cc-bar gg contribution has a sharp peak just above the threshold and that of the bb-bar -> gamma^* -> cc-bar channel is concentrated at the maximally allowed kinematic end point. We predict that Gamma[Upsilon(1S) -> cc-bar+X]/Gamma[Upsilon(1S)->light hadrons] = 0.065 alpha_s, which is smaller than a previous result by about 20%.

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