Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1992-11-09
Phys.Rev. D48 (1993) 3121-3127
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, LBL-33122 and UCB-PTH-92/38. 13 figures available by email, specify postscript or topdrawer
Scientific paper
10.1103/PhysRevD.48.3121
We investigate the discrepancy that exists at low-$x_T=2p_T/\sqrt{s}$ between the next--to--leading order QCD calculations of prompt photon production and the measured cross section. The central values of the measured cross section are of order 100\% larger than QCD predictions in this region. It has been suggested that the bremsstrahlung contribution may account for this discrepancy. The quark fragmentation function $D_{\gamma/q}(z)$ has not been measured and an exactly known asymptotic form is normally used in calculations. We examine the effect of much larger fragmentation functions on the QCD predictions. After illustrating the effect of the large fragmentation functions in some detail for recent CDF data at $\sqrt{s}$=1.8~TeV, we perform a $\chi^2$ fit to 8 prompt photon data sets ranging in CMS energy from 24~GeV to 1.8~TeV. While a large fragmentation function normalization may prove to play an important role in resolving the discrepancy, the present theoretical and experimental uncertainties prevent any definite normalization value from being determined.
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