Fine structure in the azimuthal transverse momentum correlations at $sqrt{s {NN}}=200$ GeV using the event shape analysis - High Energy Physics - PhenomenologyReport as inadecuate




Fine structure in the azimuthal transverse momentum correlations at $sqrt{s {NN}}=200$ GeV using the event shape analysis - High Energy Physics - Phenomenology - Download this document for free, or read online. Document in PDF available to download.

Abstract: The experimental results on transverse momentum azimuthal hadron correlationsat RHIC have opened a rich field for parton energy loss analysis in heavy-ioncollisions. Recently, a considerable amount of work has beendevoted to studythe shapes of the ``away-side- jet which exhibit an interesting and unexpected``double hump- structure not observed in the analogous treatment of $pp$ data.Driven by the possibility that the latter result might just mean that suchstructure exists already in the case of $pp$ collisions, but that its relativeintensity could be small, here we use the Event Shape Analysis to show that itis possible to identify and select well defined event topologies in $pp$collisions, among which, a double hump structure for the away-side jet emerges.Using two shape parameters, the sphericity in the transverse plane and therecoil to analyze a sample of PYTHIA generated $pp$ collisions at$\sqrt{s {NN}}=200$ GeV, we show that this structure corresponds to two jetsemitted in the backward hemisphere. Finally, we show that Q-PYTHIAqualitatively reproduces the decrease in the yield of dijet events and theincrease of the double hump structure in the away side observed in heavy ioncollisions. The implications for the treatment of parton energy loss inheavy-ion collisions are discussed



Author: Alejandro Ayala, Eleazar Cuautle, Isabel Dominguez, Antonio Ortiz, Guy Paic

Source: https://arxiv.org/







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