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Nuclear Theory·nucl-th

Wednesday·January 4, 2017

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 03

    DPS in CGC: HBT correlations in double inclusive photon production

    Alex Kovner🇺🇸 · Amir H. Rezaeian🇨🇱

    We introduce a technique to study double parton scattering (DPS) in the Color-Glass-Condensate (CGC) approach. We show that the cross-section of the DPS in the CGC approach is calculable in terms of new nonperturbative objects, generalized double transverse momentum-dependent parton distribution (2GTMD) functions. We investigate the production of pairs of prompt photons from two partons in the projectile hadron in high-energy proton-nucleus collisions. We show that even for independent partons in the projectile, the prompt photon correlation function exhibits Hanbury Brown and Twiss (HBT) correlations. The width of the HBT peak is controlled by the transverse distance between the parton of the pair, which is of the order of the proton size. Thus, the HBT measurements in two-particle production such as prompt photon pairs provide useful information about the nonperturbative 2GTMDs.

    ↳ hep-phhep-exnucl-thPRD(2017)·12 citations
  2. 04

    Effects of mean-field and the softening of equation of state on elliptic flow in Au+Au collision at = 5 GeV from JAM model

    Jiamin Chen🇨🇳 · Xiaofeng Luo🇺🇸 · Feng Liu🇨🇳 · Yasushi Nara🇯🇵

    We perform a systematic study of elliptic flow () in Au+Au collision at GeV by using a microscopic transport model JAM. The centrality, pseudorapidity, transverse momentum and beam energy dependence of for charged as well as identified hadrons are studied. We investigate the effects of both the hadronic mean-field and the softening of equation of state (EoS) on elliptic flow. The softening of EoS is realized by imposing attractive orbits in two body scattering, which can reduce the pressure of the system. We found that the softening of EoS leads to the enhancement of , while the hadronic mean-field suppresses relative to the cascade mode. It indicates that elliptic flow at high baryon density regions is highly sensitive to the EoS and the enhancement of may probe the signature of a first-order phase transition in heavy-ion collisions at beam energies of a strong baryon stopping region.

    ↳ nucl-exhep-exnucl-thCPC(2018)·7 citations
  3. 05

    Bottomonia suppression in an anisotropic quark-gluon plasma

    Radoslaw Ryblewski🇵🇱

    A brief review of recent studies on suppression of bottomonia in an anisotropic quark-gluon plasma created in heavy-ion collisions at the LHC is presented. A reasonable agreement between the model predictions for the inclusive suppression factor and the preliminary CMS experimental data is found. The values of the shear viscosity to the entropy density ratio extracted from the comparison with the data lie between one and two times the gauge/gravity duality lower bound. These values agree very well with the fluid dynamical fits to the light hadron correlation data and confirm that the quark-gluon plasma is a nearly-perfect fluid.

    ↳ hep-phnucl-thEPJ Web Conf.(2017)·0 citations
  4. 06

    A Complete Diagrammatic Implementation of the Kinoshita-Lee-Nauenberg Theorem at Next-to-Leading Order

    Abdullah Khalil🇿🇦 · W. A. Horowitz🇿🇦

    We show for the first time in over 50 years how to correctly apply the Kinoshita-Lee-Nauenberg theorem diagrammatically in a next-to-leading order scattering process. We improve on previous works by including all initial and final state soft radiative processes, including absorption and an infinite sum of partially disconnected amplitudes. Crucially, we exploit the Monotone Convergence Theorem to prove that our delicate rearrangement of this formally divergent series is correct. This rearrangement yields a factorization of the infinite contribution from the initial state soft photons that then cancels in the physically observable cross section. We derive the first complete next-to-leading order, high-energy Rutherford elastic scattering cross section in the renormalization scheme as an explicit example of our procedure.

    ↳ hep-thhep-phnucl-th4 citations

Affiliations

first authorsco-authorsvia INSPIRE