Inelastic quarkonium photoproduction in hadron-hadron interactions at LHC energies

Gonçalves, V. P.; Machado, M. M.

doi:10.1140/epja/i2014-14072-3

Cited by 18 publications

(25 citation statements)

References 70 publications

(53 reference statements)

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“…In contrast, for the double J/ production, the contribution associated to the description of the QCD dynamics at high energies contributes significantly, mainly in pp collisions. Predictions for the RHIC, LHC, FCC, and CEPC-SPPC energies are shown.In recent years a series of experimental results from RHIC [1,2], Tevatron [3] and LHC [4][5][6][7][8][9][10][11][12] demonstrated that the study of photon-induced interactions in hadronic colliders is feasible and that it can be used to, among other things, improve our knowledge on the nuclear gluon distribution [13][14][15][16][17][18][19], on details of QCD dynamics [20][21][22][23][24][25][26][27][28][29][30], on the mechanism of quarkonium production [29][30][31][32][33][34][35][36], on the Odderon [37,38] and on the photon flux of the proton [39,40]. These data have stimulated the development of the theoretical description of these processes as well as the proposal of new forward detectors to be installed in the LHC [41,42].…”

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confidence: 99%

Double vector meson production in $$\gamma \gamma $$ γ γ interactions at hadronic colliders

2016

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In this paper we revisit the double vector meson production in γ γ interactions at heavy ion collisions and present, by the first time, predictions for the ρρ and J/ J/ production in proton-nucleus and proton-proton collisions. In order to obtain realistic predictions for rapidity distributions and total cross sections for the double vector production in ultra peripheral hadronic collisions we take into account the description of γ γ → V V cross section at low energies as well as its behavior at large energies, associated to the gluonic interaction between the color dipoles. Our results demonstrate that the double ρ production is dominated by the low energy behavior of the γ γ → V V cross section. In contrast, for the double J/ production, the contribution associated to the description of the QCD dynamics at high energies contributes significantly, mainly in pp collisions. Predictions for the RHIC, LHC, FCC, and CEPC-SPPC energies are shown.In recent years a series of experimental results from RHIC [1,2], Tevatron [3] and LHC [4][5][6][7][8][9][10][11][12] demonstrated that the study of photon-induced interactions in hadronic colliders is feasible and that it can be used to, among other things, improve our knowledge on the nuclear gluon distribution [13][14][15][16][17][18][19], on details of QCD dynamics [20][21][22][23][24][25][26][27][28][29][30], on the mechanism of quarkonium production [29][30][31][32][33][34][35][36], on the Odderon [37,38] and on the photon flux of the proton [39,40]. These data have stimulated the development of the theoretical description of these processes as well as the proposal of new forward detectors to be installed in the LHC [41,42].The basic idea in the photon-induced processes is that an ultra relativistic charged hadron (proton or nucleus) creates strong electromagnetic fields. A photon stemming from the electromagnetic field of one of the two colliding hadrons can interact with one photon coming from the other hadron a e-mails: barros@ufpel.edu.br;victor.goncalves@thep.lu.se (photon-photon process) or it can interact directly with the other hadron (photon-hadron process) [43][44][45][46][47][48]. In these processes the total cross section can be factorized in terms of the flux of equivalent photons from the hadron projectile and the photon-photon or photon-target production cross section. In this paper we will focus on two-photon interactions in hadronic collisions. Experimental results on exclusive twophoton production of W + W − and + − pairs in γ γ interactions reported by the CMS and ATLAS Collaborations [9][10][11][12] have demonstrated that it is possible to measure such events with the experimental apparatus already available at the LHC, allowing for novel studies of QCD at very high energies and searches for Beyond Standard Model Physics (see, e.g., Ref. [49][50][51][52][53][54][55][56][57][58][59]). This motivates us to revisit the analysis of double vector meson production in ultra peripheral heavy ion collisions performed some time ago in Refs. [60][61][62...

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Double vector meson production in $$\gamma \gamma $$ γ γ interactions at hadronic colliders

2016

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“…The minimum value of the transverse momentum of the quarkonium is chosen at p Q T min = 1 GeV. The range of z J/ψ is selected from zero to the area near one (z J/ψ < 1) and the predictions are not strongly dependent on the inferior limit of the integration z J/ψ min [70]. Numerical calculations are carried out by in-house monte carlo generator.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Photoproduction of J/ψ with forward hadron tagging in hadronic collisions

2019

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We study the photoproduction of J/ψ using the NRQCD formalism with forward hadron tagging at the Large Hadron Collider. We estimate the total cross sections and event rates with and without nuclear shadowing effects in high energy proton-proton, proton-nucleus and nucleus-nucleus collisions. Our results show that the processes which involve J/ψ photoproduction depend on the choice of forward detector acceptances ξ. Under some precise cut of p J/ψ T and z J/ψ kinematic variables, we find that the distributions of photoproduction of J/ψ are led by the Fock state 1 S1 . The total cross sections and event rates will be smaller if the nuclear shadowing effects are considered. The processes give a crucial photoproduction signature at the LHC with forward detector acceptances. The exploration and the detection of the interactions will be useful for studying the mechanism of heavy quarkonium production. I. INTRODUCTIONSince the discovery of heavy quarkonia in the mid-1970s, their production and decay become reliable tools to improve our understanding of theoretical aspects of quantum chromodynamics (QCD) from the hard region, where the strong interaction is realized with a large momentum transfer, to the soft region, where the strong interaction is carried out with a small momentum transfer. These production and decay of heavy quarkonia are studied under the non-relativistic quantum chromodynamics (NRQCD) due to the large mass of heavy quarks (m c ∼ 1.5 GeV, m b ∼ 4.75 GeV). The full description of the theoretical framework was proposed by Bodwin, Braaten and Lepage(BBL) [1]. It factorizes the quarkonium production in terms of short distance QCD cross sections and long distance matrix elements (LDMEs). The former can be pertubatively evaluated in series of the running coupling constant α s while the latter is the probability for a heavy QQ pair with spin S, orbital angular momentum L, total angular momentum J, and color multiplicity a = 1 (color-singlet), 8 (color-octet) to evolve into a physical heavy quarkonium state. The value of LDMEs can either be calculated by utilizing non-perturbative methods or extracted phenomenologically from data [2], i.e., QCD lattice simulations or measurements in some production processes. The QQ pair is generated from the partonic interaction at short distances in color singlet (CS) or in color-octet (CO) states and hadronizes into physical CS observable by emitting soft gluons non-perturbatively. The effect of LDME contribution has a hierarchically ordered scaling with v [3], v being the nonrelativistic velocity of Q orQ in the QQ rest frame. The essence of this theory can now be systematically shortened by the double expansion in powers of α s and v. A lot of phenomenological approaches of this framework are meticulously narrated in Refs [4,5,7,8], taking into account the complete and spanned structure of the QQ Fock space by the state n = 2S+1 L (a) J . However, the golden age of the NRQCD theory has been to address the limitations of the early proposed models from which it establishes...

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“…In recent years a series of experimental results at RHIC [18,19], Tevatron [20] and LHC [21][22][23][24][25][26][27][28][29] demonstrated that the study of photon-induced interactions in hadronic colliders is feasible and can be used to probe e.g. the nuclear gluon distribution [30][31][32][33][34][35][36][37][38][39][40][41], the dynamics of the strong interactions [42][43][44][45][46][47][48][49][50][51][52], the Odderon [59,60], the mechanism of quarkonium production [51][52][53][54][55][56][57][58] and the photon flux of the proton [61,62]. It has stimulated the improvement of the theoretical description of these processes as well as the proposal of new forward detectors to be installed in the LHC …”

Section: Introductionmentioning

confidence: 99%

Probing the gluon density of the proton in the exclusive photoproduction of vector mesons at the LHC: a phenomenological analysis

2016

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The current uncertainty on the gluon density extracted from the global parton analysis is large in the kinematical range of small values of the Bjorken-x variable and low values of the hard scale Q 2 . An alternative to reduces this uncertainty is the analysis of the exclusive vector meson photoproduction in photon-hadron and hadron-hadron collisions. This process offers a unique opportunity to constrain the gluon density of the proton, since its cross section is proportional to the gluon density squared. In this paper we consider current parametrisations for the gluon distribution and estimate the exclusive vector meson photoproduction cross section at HERA and LHC using the leading logarithmic formalism. We perform a fit of the normalisation of the γ h cross section and the value of the hard scale for the process and demonstrate that the current LHCb experimental data are better described by models that assume a slow increasing of the gluon distribution at small x and low Q 2 .One of the basic ingredients to estimate the hadronic cross sections are the parton distributions functions (PDFs). Theoretically, at large energies the hadrons are dominated by gluons, with its behaviour at small x being determined by the QCD dynamics at high parton densities. Consequently, a precise determination of the gluon distribution is fundamental to probe a possible transition between the linear and nonlinear regimes of the QCD dynamics [1]. Experimentally, our understanding about the partonic structure of the proton has been significantly improved by the results obtained in ep collisions at HERA, which have obtained very precise data in a broad range in photon virtualities Q 2 and Bjorken-x values, imposing the tightest constraints on the existing PDFs (for recent reviews see, e.g. Refs. [2][3][4]). However, the behaviour of the gluon distribution at small x is still poorly known as can be observed in Fig. 1, where we compare the predictions for the gluon distribution obtained by different groups a e-mail: barros@ufpel.edu.br [5][6][7][8][9] that perform the global analysis of the existing experimental data using the DGLAP evolution equations [10][11][12] in order to determine the parton distributions. Consequently, additional measurements are necessary to pin down the gluon distribution. An alternative is the analysis of the experimental results for the heavy quark production at forward rapidities in pp collisions at the LHC energies. Recent results [13][14][15] have analysed the impact of the LHCb data in the determination of the gluon distribution. Another promising observable is the cross section for the diffractive production of vector mesons, which in the leading logarithmic approximation is proportional to the gluon density squared [16,17]. This process was analysed at HERA and is currently been studied in photon-induced interactions at hadronic colliders. In recent years a series of experimental results at RHIC [18,19], Tevatron [20] and LHC [21][22][23][24][25][26][27][28][29] demonstrated that the study of ph...

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Inelastic quarkonium photoproduction in hadron-hadron interactions at LHC energies

Cited by 18 publications

References 70 publications

Double vector meson production in $$\gamma \gamma $$ γ γ interactions at hadronic colliders

Double vector meson production in $$\gamma \gamma $$ γ γ interactions at hadronic colliders

Photoproduction of J/ψ with forward hadron tagging in hadronic collisions

Probing the gluon density of the proton in the exclusive photoproduction of vector mesons at the LHC: a phenomenological analysis

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