Upsilon Transverse Momentum at Hadron Colliders
Abstract
We predict the shape of the transverse momentum pT spectrum of Upsilon production. The distribution at low pT is dominated by the region of small impact parameter b and may be computed reliably in perturbation theory. We resum to all orders in the strong coupling alphas the process-independent large logarithmic contributions that arise from initial-state gluon showers in the small pT (< MUpsilon) region. The cross section at large pT is represented by the alphas3 lowest-order non-vanishing perturbative contribution.
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