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Nuclear Theory·nucl-th

Monday·October 29, 2018

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 05

    [Submitted on 25 Oct 2018] (cross-list from hep-lat)

    Reliability of Taylor expansions in QCD

    Bastian B. Brandt🇩🇪 · Gergely Endrodi🇩🇪

    We investigate the reliability of the Taylor expansion method in QCD with isospin chemical potentials using lattice simulations. By comparing the expansion of the number density to direct results, the range of validity of the leading- and next-to-leading order expansions is determined. We also elaborate on the convergence properties of the Taylor series by comparing the leading estimate for the radius of convergence to the position of the nearest singularity, i.e. the onset of pion condensation. Our results provide a handle for quantifying the uncertainties of Taylor expansions in baryon chemical potentials.

    Comments:
    8 pages, 8 figures; v2: typos corrected, reference list updated, discussion on finite size effects clarified
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1810.11045 [pdf]
    PRD(2019)·46 citations
  2. 06

    [Submitted on 26 Oct 2018] (cross-list from hep-ph)

    TMD factorization for dijets + photon production from the dilute-dense CGC framework

    Tolga Altinoluk🇵🇱 · Renaud Boussarie🇵🇱 · Cyrille Marquet🇫🇷 · Pieter Taels🇮🇹

    We calculate the production of a photon and two jets at forward rapidity in proton-nucleus collisions, within the hybrid dilute-dense framework in the Color Glass Condensate (CGC) formalism. After obtaining the cross section for both the quark- and gluon-initiated channels, we consider the correlation limit, in which the vector sum of the transverse momenta of the three outgoing particles is small with respect to the individual transverse momenta. In this limit, the cross section simplifies considerably and can be written in a factorized form, sensitive to various unpolarized and linearly-polarized transverse-momentum-dependent gluon distribution functions (gluon TMDs). Thus, we demonstrate for the first time that the emergence of a TMD factorization formula in the correlation limit, from CGC expressions, holds beyond the previously-considered simpler processes.

    Comments:
    65 pages, 2 figures. V2: Typos corrected, references added, sign mistake corrected, main results remained unchanged, new appendix added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1810.11273 [pdf]
    JHEP(2019)·40 citations

Affiliations

first authorsco-authorsvia INSPIRE