Jet quenching from QCD evolution

Abstract

Recent advances in soft-collinear effective theory with Glauber gluons have led to the development of a new method that gives a unified description of inclusive hadron production in reactions with nucleons and heavy nuclei. We show how this approach, based on the generalization of the DGLAP evolution equations to include final-state medium-induced parton shower corrections for large Q 2 processes, can be combined with initial-state effects for applications to jet quenching phenomenology. We demonstrate that the traditional parton energy loss calculations can be regarded as a special soft-gluon emission limit of the general QCD evolution framework. We present phenomenological comparison of the SCETG-based results on the suppression of inclusive charged hadron and neutral pion production in √ sNN = 2.76 TeV lead-lead collisions at the Large Hadron Collider to experimental data. We also show theoretical predictions for the upcoming √ sNN 5.1 TeV Pb+Pb run at the LHC.

Small Collision Systems at RHIC

“…However, the enhancement occurs at p T ∼ 5 GeV/c higher than the expected contribution from multiple scattering. The high-p T nuclear modification is very comparable within the different collisions system and the data suggest it is independent on the projectile could suggest some (cold/hot) energy loss in the most central collisions [12]. The jets are suffering both IS and FS effects, while the direct photons would be sensitive only to the IS effects.…”

D meson production in heavy ion collisions with CMS

“…The R AA of inclusive charged particles are superimposed for equivalent event selections [8]. Experimental results are compared to various theoretical calculations [9][10][11][12][13][14][15][16][17].…”

Vector boson tagged jets and jet substructure

“…In figure 2 we also give results of our theoretical calculations in Pb+Pb collisions. The green and magenta histograms correspond to jet-medium coupling strengths g = 2.0 and g = 2.2, respectively, values that have worked well in describing the light inclusive hadron [23,24] and jet suppression data [18] at the LHC. Our results include both medium-induced radiative energy loss and the parton showers energy dissipation of through collisional processes in the QGP.…”

“…In equation 1 P q,g ( ) is the probability that a fraction of the parent parton is redistributed through medium-induced multiple gluon emission. We employ the soft gluon emission limit of the of the SCET G [19,20] splitting functions [21,22] used to predict inclusive light hadron attenuation in heavy ion collisions [23,24]. We note that the spectrum coincides with the original energy loss derivation of [25].…”

“…These include jet shapes, jet fragmentation functions and jet momentum sharing distributions. In these proceedings we also report on calculation of two of the above [14,15] in a theoretical framework that uses the same fundamental input -the in-medium splitting functions.…”