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Cross sections and double-helicity asymmetries of midrapidity inclusive charged hadrons in p+ p collisions at sqrt (s)= 62.4 GeV

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/20556

Cross sections and double-helicity asymmetries of midrapidity inclusive charged hadrons in p+ p collisions at sqrt (s)= 62.4 GeV

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Title: Cross sections and double-helicity asymmetries of midrapidity inclusive charged hadrons in p+ p collisions at sqrt (s)= 62.4 GeV
Author: Fields, Douglas E.; PHENIX Collaboration; Barnes, P.D.; Boissevain, J.G.; Brooks, M.L.; Butsyk, S.; Camacho, C.M.; Constantin, P.; Kapustinsky, J.; Kunde, G.J.; Lee, D.M.; Leitch, M.J.; Liu, M.X.; McGaughey, P.L.; Palounek, A.P.T.; Purwar, A.K.; Sondheim, W.E.; Van Hecke, H.W.; Bassalleck, B.; Malik, M.D.; Rak, J.; Thomas, T.L.; Younus, I.; Al-Bataineh, H.; Kyle, G.S.; Liu, H.; Papavassiliou, V.; Pate, S.F.; Stepanov, M.; Wang, X.R.
Abstract: The comparison of cross-section predictions with data on single-inclusive hadron production in hadronic collisions, p+p → h + X, is important for understanding perturbative quantum chromodynamics (pQCD). For hadrons produced with transverse momenta pT ≫ _QCD, the cross section factorizes into a convolution involving long-distance and short-distance components [1, 2]. Long-distance components include universal partondistribution functions (PDFs) describing the partonic structure of the initial hadrons and fragmentation functions (FFs) for the final-state hadron. The short-distance part describes the hard scattering of partons. The long distance components, PDFs and FFs, can be extracted from other processes, such as deep-inelastic scattering and hadron production in e+e− colliders. This allows for a test of the short-distance part of the convolution, which can be estimated using pQCD. In particular, differences between data and predictions can indicate the importance of neglected higher-order terms in the expansion or power-suppressed contributions [3].
Date: 2012-05-14
Description: Preprint
URI: http://hdl.handle.net/1928/20556


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