Photon plus heavy-quark production in high-energy collisions within the target rest frame formalism

Abstract

We apply the target rest frame formalism to photon þ heavy quark production cross section in hadronic collisions at high energies. We investigate the dependence of the production cross section on the photon and quark rapidities and transverse momenta. It is shown that the photon transverse momentum spectrum is a sensitive probe of color dipole scattering amplitude. The theoretical results are compared to Tevatron measurements of the differential þ c þ X and þ b þ X production cross sections at ffiffi ffi s p ¼ 1:96 TeV.An analysis for proton-proton and proton-lead collisions at the LHC regime is also performed.

Momentum space saturation model for deep inelastic scattering and single inclusive hadron production

“…As they interact only electromagnetically with the medium, the direct (prompt) photon arises as a good tool to investigate initial state effects and saturation effects in hadronic collisions. This observable is well-studied in the color dipole formalism [42] and could be also used to investigate the heavy quark contribution to the dipole scattering amplitudes through the photon plus heavy quark production, as recently done in [43] with both dipole models [37,39].…”

Exclusive dilepton production via timelike Compton scattering in heavy ion collisions

“…For instance, the nuclear structure functions have been well described using factorization for nuclear targets in Refs. [30,[52][53][54].…”

Probing gluon and heavy-quark nuclear PDFs with γ + Q production in pA collisions

“…Start values for the parameter at Q 0 = 1.3 GeV predicted within the different nCTEQ sets -fits from top to bottom: decut3g9, decut3g5, decut3g7, decut3g8, decut3g3, decut3g4, decut3g2, decut3g1, decut3g. Right: nCTEQ gluon nPDFs for different A (1,2,4,9,12,27,56,108,207) vs x at Q 0 = 1.3 GeV -from left to right, and top to bottom: decut3g, decut3g1, decut3g2, decut3g3, decut3g4, decut3g5, decut3g7, decut3g8, decut3g9.…”

“…2 Note that the EPS08/EPS09 [14,15] global analyses include single-inclusive π 0 data from the PHENIX experiment at RHIC. 3 A recent paper by Betemps and Machado [27] has performed a calculation for γ + c production using however the target rest frame formalism.…”