J/{psi} production at CERN LEP: Revisited and resummed
- Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
We present the leading order differential and total rates for J/{psi} production at CERN LEP. By leading order we mean all terms of the form {alpha}{sub s}[{alpha}{sub s}&hthinsp;log(M{sub Z}{sup 2}/M{sub {psi}}{sup 2})]{sup n} and {alpha}{sub s}{sup n+1}&hthinsp;log{sup l}(z{sup 2})log{sup m}(M{sub Z}{sup 2}/M{sub {psi}}{sup 2}), (l+m=2n{minus}1), in the regions z=2E{sub {psi}}/M{sub Z}{approximately}O(1) and z{lt}1, respectively. In the intermediate region we interpolate using the available data. This resummation eliminates the O[{alpha}{sub s}(M{sub {psi}})/{alpha}{sub s}(M{sub Z})]{approximately}2 theoretical uncertainties in previous calculations. The log(z) resummation results in a suppression of the small z region due to coherent gluon emission. Comparing the zeroth moment with the LEP data we find the value for the effective octet matrix element to be {l_angle}{cflx O}{sub 8}{sup {psi}}({sup 3}S{sub 1}){r_angle}=0.019 GeV{sup 3}. The theoretical uncertainties are substantially smaller than those from Fermilab Tevatron extractions. Using this value of the octet matrix element we make a prediction for the first moment of the differential rate and find that the resummed differential decay rate is in much better agreement with preliminary data than the color singlet result or the unresummed color octet prediction. thinsp {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 308260
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 59; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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