Higher-Twist Contributions to Large Transverse Momentum Hadron Production in hadronic collisions

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The scaling behavior of large-p{sub {perpendicular}} hadron production in hadronic collisions is investigated. A significant deviation from the NLO QCD predictions is reported, especially at high values of x{sub {perpendicular}} = 2p{sub {perpendicular}}/{radical}s. In contrast, the prompt photon and jet production data prove in agreement with leading-twist expectations. These results are interpreted as coming from a non-negligible contribution of higher-twist processes, where the hadron is produced directly in the hard subprocess. Predictions for scaling exponents at RHIC are successfully compared to PHENIX preliminary measurements. We suggest to trigger on isolated large-p{sub {perpendicular}} hadron production to enhance higher-twist processes, and point ... continued below

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4 pages

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Arleo, Francois; /Annecy, LAPTH; Brodsky, Stanley J.; /SLAC /Southern Denmark U., CP3-Origins; Hwang, Dae Sung; U., /Sejong et al. August 25, 2010.

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The scaling behavior of large-p{sub {perpendicular}} hadron production in hadronic collisions is investigated. A significant deviation from the NLO QCD predictions is reported, especially at high values of x{sub {perpendicular}} = 2p{sub {perpendicular}}/{radical}s. In contrast, the prompt photon and jet production data prove in agreement with leading-twist expectations. These results are interpreted as coming from a non-negligible contribution of higher-twist processes, where the hadron is produced directly in the hard subprocess. Predictions for scaling exponents at RHIC are successfully compared to PHENIX preliminary measurements. We suggest to trigger on isolated large-p{sub {perpendicular}} hadron production to enhance higher-twist processes, and point that the use of isolated hadrons as a signal for new physics at colliders can be affected by the presence of direct hadron production processes.

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4 pages

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  • Talk given at 45th Rencontres de Moriond: QCD and High Energy Interactions, La Thuile, Aosta Valley, Italy, 13-20 Mar 2010

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  • Report No.: SLAC-PUB-14180
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 992947
  • Archival Resource Key: ark:/67531/metadc1012985

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  • August 25, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Nov. 2, 2017, 8:13 p.m.

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Arleo, Francois; /Annecy, LAPTH; Brodsky, Stanley J.; /SLAC /Southern Denmark U., CP3-Origins; Hwang, Dae Sung; U., /Sejong et al. Higher-Twist Contributions to Large Transverse Momentum Hadron Production in hadronic collisions, article, August 25, 2010; [California]. (digital.library.unt.edu/ark:/67531/metadc1012985/: accessed April 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.