Resumming the color octet contribution to e+ e- ---> J / psi + X

Fleming, Sean; Leibovich, Adam; Mehen, Thomas

doi:10.1103/PhysRevD.68.094011

Title: Resumming the color octet contribution to e+ e- ---> J / psi + X

Journal Article · Sat Nov 01 00:00:00 EST 2003 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.68.094011· OSTI ID:955395

Fleming, Sean; Leibovich, Adam; Mehen, Thomas

Recent observations of the spectrum of J/psi produced in e+ e- collisions at the Upsilon(4S) resonance are in conflict with fixed-order calculations using the Non-Relativistic QCD (NRQCD) effective field theory. One problem is that leading order color-octet mechanisms predict an enhancement of the cross section for J/psi with maximal energy that is not observed in the data. However, in this region of phase space large perturbative corrections (Sudakov logarithms) as well as enhanced nonperturbative effects are important. In this paper we use the newly developed Soft-Collinear Effective Theory (SCET) to systematically include these effects. We find that these corrections significantly broaden the color-octet contribution to the J/psi spectrum. Our calculation employs a one-stage renormalization group evolution rather than the two-stage evolution used in previous SCET calculations. We give a simple argument for why the two methods yield identical results to lowest order in the SCET power

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-84ER40150

OSTI ID:: 955395

Report Number(s):: JLAB-THY-03-245; hep-ph/0306139; DOE/ER/40150-4421; TRN: US201014%%1255

Journal Information:: Physical Review D, Vol. 69

Country of Publication:: United States

Language:: English

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