Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-03-09
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 5 figures; discussion extended, references added; accepted for publication in Physical Review Letters
Scientific paper
We compare the transverse momentum (p_T) distribution of inclusive light-charged-particle production measured by the CDF Collaboration at the Fermilab Tevatron with the theoretical prediction evaluated at next-to-leading order in quantum chromodynamics (QCD) using fragmentation functions recently determined through a global data fit. While, in the lower p_T range, the data agree with the prediction within the theoretical error or slightly undershoot it, they significantly exceed it in the upper p_T range, by several orders of magnitude at the largest values of p_T, where perturbation theory should be most reliable. This disagreement is too large to be remedied by introducing additional produced particles into the calculation, and potentially challenges the validity of the factorization theorem on which the parton model of QCD relies. Clearly, a breakdown of the factorization theorem, being a fundamental property of QCD, would be extremely difficult to understand.
Albino Simon
Kniehl Bernd A.
Kramer Georgiana
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