Revisiting scaling properties of medium-induced gluon radiation - High Energy Physics - PhenomenologyReport as inadecuate




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Abstract: Discussing the general case of a hard partonic production process, we showthat the notion of parton energy loss is not always sufficient to fully addressmedium-induced gluon radiation. The broader notion of gluon radiationassociated to a hard process has to be used, in particular when initial andfinal state radiation amplitudes interfere, making the medium-induced radiatedenergy different from the energy loss of any well-identified parton. Ourarguments are first presented in an abelian QED model, and then applied tolarge-xF quarkonium hadroproduction. In this case, we show that themedium-induced radiated energy is qualitatively similar but not identical tothe radiative energy loss of an -asymptotic massive parton- undergoingtransverse momentum broadening when travelling through the nucleus. Inparticular, it scales as the incoming parton energy, which suggests toreconsider gluon radiation as a possible explanation of large-xF quarkoniumsuppression in p-A collisions. We expect a similar effect in open heavy-flavourand possibly light-hadron hadroproduction at large xF, depending on the precisedefinition of the nuclear suppression factor in the latter case.



Author: Francois Arleo, Stephane Peigne, Taklit Sami

Source: https://arxiv.org/







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