PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·November 25, 2015

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 04

    Diffractive Dijet Production in Deep Inelastic Scattering and Photon-Hadron Collisions in the Color Glass Condensate

    Tolga Altinoluk🇪🇸 · Néstor Armesto🇪🇸 · Guillaume Beuf🇮🇹 · Amir H. Rezaeian🇨🇱

    We study exclusive dijet production in coherent diffractive processes in deep inelastic scattering and real (and virtual) photon-hadron (-h) collisions in the Color Glass Condensate formalism at leading order. We show that the diffractive dijet cross section is sensitive to the color-dipole orientation in the transverse plane, and is a good probe of possible correlations between the -dipole transverse separation vector \r and the dipole impact parameter . We also investigate the diffractive dijet azimuthal angle correlations and -distributions in -h collisions and show that they are sensitive to gluon saturation effects in the small- region. In particular, we show that the -distribution of diffractive dijet photo-production off a proton target exhibits a dip-type structure in the saturation region. This effect is similar to diffractive vector meson production. Besides, at variance with the inclusive case, the effect of saturation leads to stronger azimuthal correlations between the jets.

    ↳ hep-phhep-exnucl-thPLB(2016)·105 citations
  2. 05

    On the Evolution of Jet Energy and Opening Angle in Strongly Coupled Plasma

    Paul M. Chesler🇺🇸 · Krishna Rajagopal🇺🇸

    We calculate how the energy and the opening angle of jets in SYM theory evolve as they propagate through the strongly coupled plasma of that theory. We define the rate of energy loss and the jet opening angle in a straightforward fashion directly in the gauge theory before calculating both holographically, in the dual gravitational description. In this way, we rederive the previously known result for without the need to introduce a finite slab of plasma. We obtain a striking relationship between the initial opening angle of the jet, which is to say the opening angle that it would have had if it had found itself in vacuum instead of in plasma, and the thermalization distance of the jet. Via this relationship, we show that SYM jets with any initial energy that have the same initial opening angle and the same trajectory through the plasma experience the same fractional energy loss. We also provide an expansion that describes how the opening angle of the SYM jets increases slowly as they lose energy, over the fraction of their lifetime when their fractional energy loss is not yet large. We close by looking ahead toward potential qualitative lessons from our results for QCD jets produced in heavy collisions and propagating through quark-gluon plasma.

    ↳ hep-thhep-phnucl-thJHEP(2016)·64 citations
  3. 06

    Holographic thermalization with initial long range correlation

    Shu Lin🇨🇳

    We studied the evolution of Wightman correlator in a thermalizing state modeled by AdS_3-Vaidya background. We gave a prescription for calculating Wightman correlator in coordinate space without using any approximation. For equal-time correlator , we obtained an enhancement factor due to long range correlation present in the initial state. This was missed by previous studies based on geodesic approximation. We found that the long range correlation in initial state does not lead to significant modification to thermalization time as compared to known results with generic initial state. We also studied spatially integrated Wightman correlator and showed evidence on the distinction between long distance and small momentum physics for an out-of-equilibrium state. We also calculated radiation spectrum of particle weakly coupled to and found lower frequency mode approaches thermal spectrum faster than high frequency mode.

    ↳ hep-thhep-phnucl-thPRD(2016)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE