Predictions for the Isolated Prompt Photon Production at the LHC at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt></mml:mrow></mml:math>= 13 TeV

Goharipour, Muhammad; Mehraban, Hossein

doi:10.1155/2017/3802381

Cited by 8 publications

(7 citation statements)

References 107 publications

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“…However, the application of the isolation criteria in the measurements reduces the parton-to-photon fragmentation contribution to the total cross section. Indeed, the most recent measurements of ATLAS experiment [38,39], performed with the isolation requirement P T iso < 4.8 GeV + 4.2 10 −3 P T γ calculated within a cone of size ΔR = 0.4, reduce significantly the fragmentation components, as indicated in [40]. Furthermore, the contributions from the fragmentation decrease considerably when |cos θ * | → 0 [41,42].…”

Section: Direct Photon Productionmentioning

confidence: 97%

Bounds on the scale of noncommutativity from mono photon production in ATLAS Runs -1 and -2 experiments at LHC energies

Bekli

Chadou

Mebarki

2021

Int. J. Geom. Methods Mod. Phys.

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Leading order study of direct photon production from proton–proton collisions, in the framework of Minimal (Seiberg–Witten) Non-Commutative Standard Model (NCSM), taking into account the Earth-rotation effects. We found that relative non-commutative contributions increase significantly at very high photon transverse momentum. Therefore, using Run-1 ([Formula: see text] TeV) and Run-2 ([Formula: see text] TeV) ATLAS experimental data of inclusive isolated prompt photon cross-section, TeV-Scale bounds of the non-commutativity (NC) parameter are obtained. For space-space non-commutativity, we obtain: [Formula: see text][Formula: see text]TeV, and for space-time non-commutativity, we obtain : [Formula: see text][Formula: see text]TeV.

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Section: Direct Photon Productionmentioning

confidence: 97%

Bounds on the scale of noncommutativity from mono photon production in ATLAS Runs -1 and -2 experiments at LHC energies

Bekli

Chadou

Mebarki

2021

Int. J. Geom. Methods Mod. Phys.

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“…However, looking for similar quantities with more benefits is really of interest. It has been indicated that the ratio of distributions for different rapidity regions can be a good option [87]. In Refs.…”

Section: B Rapidity Normalized Distributionsmentioning

confidence: 99%

Probing nuclear modifications of parton distribution functions through the isolated prompt photon production at energies available at the CERN Large Hadron Collider

Goharipour

Rostami

2019

Phys. Rev. C

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An accurate knowledge of nuclear parton distribution functions (nPDFs) is an essential ingredient of high energy physics calculations when the processes are involving nuclei in the initial state. It is well known now that the prompt photon production both in hadronic and nuclear collisions is a powerful tool for exploring the parton densities in the nucleon and nuclei especially of the gluon. In this work, we are going to perform a comprehensive study of the isolated prompt photon production in p-Pb collisions at backward rapidities to find the best kinematic regions in which the experimental measurements have most sensitivity to the nuclear modifications of parton densities.Most emphasis will be placed on the antishadowing nuclear modification. To this aim, we calculate and compare various quantities at different values of center-of-mass energy covered by the LHC and also different rapidity regions to realize which one is most useful.Besides the parton distribution functions (PDFs), whether unpolarized [1][2][3][4][5][6][7][8][9][10][11] or polarized [12][13][14][15][16][17][18], and fragmentation functions (FFs) [19][20][21][22][23], the nuclear modifications of PDFs [24][25][26][27][28][29][30][31] are also important ingredients of high energy physics calculations, in particular, for processes involving nuclei in the initial state. In fact, without having nuclear PDFs (nPDFs) which describe the structure of the colliding nuclei, the theoretical calculation of the cross sections in any nuclear collision will not be possible. Thanks to the collinear factorization theorem [32,33], the nPDFs can be extracted just in a way similar to the PDFs determination through a global analysis of nuclear experimental data. Nowadays, due to many developments achieved in the phenomenological approaches, theoretical calculations and experimental measurements, the PDFs are well determined in a wide range of the momentum fraction x. However, the situation is not very satisfying for the case of nPDFs because of the lack of experimental data.Although the main experimental data for constraining nPDFs come from the old fixedtarget deep inelastic scattering (DIS) and proton-nucleus Drell-Yan (DY) dilepton production experiments, there are some analyses in which the neutrino DIS data have also been used [25,27,30]. Furthermore, the inclusive pion production from d-Au collisions at RHIC that can be considered as another source to put further constraints on the nuclear gluon distribution is usually used in the nPDFs analyses [26][27][28]30]. Recently, EPPS16 [30] has also included, for the first time, the fixed-target DY data in pion-nucleus collisions and new LHC proton-lead (p-Pb) data on dijet and heavy gauge-boson production. There are also some studies show that important information about nPDFs can be achieved by analyzing the prompt photon production in nuclear collisions [34][35][36][37][38][39], jet and dijet photoproduction measurements at a future electron-ion collider (EIC) [40,41], single inclusive jet production at very forwa...

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“…Since the PDFs are the nonperturbative objects, they have to be constrained in a global analysis to experimental data [3,4,5,6,7,8,9,10,11,12,13]. In this vein, the determination of the gluon distribution both in the nucleon [93] and nuclei [94], and also the sea quark distributions and possible asymmetries between them is of particular importance. Nowadays, thanks to many experiments provide a wide range of accurate data including the DIS, pp and pp collider measurements, our knowledge of the valence quarks, and to a large extent, sea quarks and gluon distributions is satisfying.…”

Section: The S − S Asymmetry In the Protonmentioning

confidence: 99%

Study of the s−s¯ asymmetry in the proton

Goharipour

2018

Nuclear Physics A

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The study of s −s asymmetry is essential to better understand of the structure of nucleon and also the perturbative and nonperturbative mechanisms for sea quark generation. Actually, the nature and dynamical origins of this asymmetry have always been an interesting subject to research both experimentally and theoretically. One of the most powerful models can lead to s−s asymmetry is the meson-baryon model (MBM). In this work, using a simplified configuration of this model suggested by Pumplin, we calculate the s −s asymmetry for different values of cutoff parameter Λ, to study the dependence of model to this parameter and also to estimate the theoretical uncertainty imposed on the results due to its uncertainty. Then, we study the evolution of distributions obtained both at next-to-leading order (NLO) and next-to-next-to-leading order (NNLO) using different evolution schemes. It is shown that the evolution of the intrinsic quark distributions from a low initial scale, as suggested by Chang and Pang, is not a good choice at NNLO using variable flavor number scheme (VFNS).

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Predictions for the Isolated Prompt Photon Production at the LHC ats= 13 TeV

Cited by 8 publications

References 107 publications

Bounds on the scale of noncommutativity from mono photon production in ATLAS Runs -1 and -2 experiments at LHC energies

Bounds on the scale of noncommutativity from mono photon production in ATLAS Runs -1 and -2 experiments at LHC energies

Probing nuclear modifications of parton distribution functions through the isolated prompt photon production at energies available at the CERN Large Hadron Collider

Study of the s−s¯ asymmetry in the proton

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