nucl-th digest · Oct 29, 2018

Reliability of Taylor expansions in QCD

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.

↳ hep-lathep-phnucl-exnucl-thPRD(2019)·46 citations

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 $2 \to 2$ processes.

↳ hep-phnucl-thJHEP(2019)·40 citations

Monday·October 29, 2018

Reliability of Taylor expansions in QCD

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

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