Direct photon production in association with a heavy quark at hadron colliders

Stavreva, T.; Owens, J.F.

doi:10.1103/physrevd.79.054017

Cited by 72 publications

(115 citation statements)

References 16 publications

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“…While such trend is expected from an intrinsic charm contribution to the PDFs, the magnitude of the effect observed in the data is too large. Taking into account the CTEQ66c PDF, which includes the IC contribution obtained within the BHPS model [7,8], the observed excess is about 1.5 times larger than what the addition of an intrinsic charm contribution to the proton predicts [27]. First studies of the γ + b-jets pp-production featured no enhancement in the p γ T -spectrum [23,26].…”

Section: Introductionmentioning

confidence: 99%

Search for intrinsic charm in vector boson production accompanied by heavy-flavor jets

et al. 2015

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Assuming the possible existence of an intrinsic (or valence-like) heavy quark component in the proton distribution functions, we analyze the vector boson Z/W production, accompanied by heavy flavor jets, in pp collisions at the LHC energies. We present theoretical predictions for differential cross sections of such processes and demonstrate their large sensitivity to PDF including an intrinsic charm component to the proton in some kinematical regions. Ratio measurements of the Z+ heavy flavor jets differential cross sections over the corresponding spectra in W + heavy jets events are proposed. These ratios are studied as a function of two different observables that maximize their sensitivity to the intrinsic charm component of the proton: the transverse momentum of the leading heavy flavor jet and the longitudinal momentum fraction x Q F of this jet. Such measurements look very promising for the LHC experiments because they can supply unique information about the intrinsic charm hypothesis.

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Section: Introductionmentioning

confidence: 99%

Search for intrinsic charm in vector boson production accompanied by heavy-flavor jets

et al. 2015

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“…The γ + b production differential cross sections as a function of p T in the two photon rapidity regions, |y| < 1.0 and 1.5 < |y| < 2.5 (the latter results are multiplied by 0.3 for presentation). The measurements are compared to the NLO QCD calculations [11] using CTEQ6.6M PDFs (solid line). The predictions from SHERPA, PYTHIA and a "kT factorization" approach [12] are shown by the dash-dotted, dotted and dashed lines, respectively.…”

Section: Photon + C-jet Cross Sectionmentioning

confidence: 99%

DØ Results on Diphoton Direct Production and Photon + b and c Jet Production

Sawyer

2013

EPJ Web of Conferences

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Abstract. In this note we present measurements of the direct photon pair production cross sections using 8.5 fb −1 of data collected with the DØ detector at the Fermilab Tevatron pp collider at √ s = 1.96 TeV. The results are shown as differential distributions with respect to the photon pair mass, pair transverse momentum, azimuthal angle, and polar scattering angle in the Collins-Soper frame. We also present measurements of the differential cross section dσ/d p γ T for the inclusive production of a photon in association with a b-or c-quark jet. The results are based on 8.7 fb −1 of data, and the measured cross sections are compared with next-to-leading order perturbative QCD calculations using different sets of parton distribution functions as well as to predictions based on the kT-factorization QCD approach, and those from various Monte Carlo event generators.

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“…In particular, it was observed that the ratio of the experimental spectrum of the prompt photons, (accompanied by the c-jets) to the relevant theoretical expectation (based on the conventional PDF which ignored the intrinsic charm) increases with p γ T up to factor about 3 when p γ T reaches 110 GeV/c. Furthermore, taking into account the CTEQ66c PDF, which includes the IC contribution obtained within the BHPS model [1,2] one can increase this ratio up to 1.5 [11]. For the γ + b-jets pp-production no enhancement in the p γ T -spectrum was observed at the beginning of the experiment [8,10].…”

Section: Prompt Photon and C-jet Productionmentioning

confidence: 99%

Searching for intrinsic charm in the proton at the LHC

Bednyakov

Demichev

Lykasov

et al. 2013

EPJ Web of Conferences

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The LHC with pp-collisions at √ s = 7-14 TeV will obviously supply extra unique information concerning the non-zero intrinsic (or valence-like) heavy quark component of the proton distribution functions component of the proton. On the basis of theoretical study it is demonstrated that investigaton of the intrinsic heavy quark contributions looks very promising at the LHC in processes like pp → γ + c(b) + X.

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Direct photon production in association with a heavy quark at hadron colliders

Cited by 72 publications

References 16 publications

Search for intrinsic charm in vector boson production accompanied by heavy-flavor jets

Search for intrinsic charm in vector boson production accompanied by heavy-flavor jets

DØ Results on Diphoton Direct Production and Photon + b and c Jet Production

Searching for intrinsic charm in the proton at the LHC

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