Double<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>production at photon colliders

Qiao, C. F.

doi:10.1103/physrevd.64.077503

Cited by 21 publications

(16 citation statements)

References 23 publications

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“…Our calculation is identical to that of Ref. [5], with the only exception that we consider individual helicity amplitudes rather than the entire spin-averaged matrix element. The polarization vectors of the initial photons and outgoing mesons are presented in our approach as explicit 4-vectors.…”

Section: A Box Diagramssupporting

confidence: 53%

“…At high energies, these mechanisms correspond to the quark-antiquark exchanges in the crossed channels and will die out with increasing γγ energies. The numerical predictions of [5] were however shown only at high (linear collider) energies ( √ s > 400 GeV)…”

Section: Introductionmentioning

confidence: 99%

“…Formally lower-order processes of the box type were studied in [5]. In these calculation heavy-quark approximation was used in order to calculate the twoloop amplitudes.…”

Section: Introductionmentioning

confidence: 99%

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The γγ→J/ψJ/ψ reaction and the J/ψJ/ψ pair production in exclusive ultraperipheral ultrarelativistic heavy ion collisions

Baranov

Cisek²,

Kłusek-Gawenda³

et al. 2013

Eur. Phys. J. C

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We calculate the cross section for the γγ → J/ψJ/ψ process. Two mechanisms are considered: box (two-loop) diagrams of the order of O(α 2 em α 2 s ) and two-gluon exchange of the order of O(α 2 em α 4 s ). The first mechanism is calculated in the heavy-quark non-relativistic approximation while the second case we also include the effects of quantum motion of quarks in the bound state. The box contribution dominates at energies close to the threshold (W < 15 GeV) while the twogluon mechanism takes over at W > 15 GeV. Including the bound-state wave function effects for the two-gluon exchange mechanism gives a cross section 0.1 -0.4 pb, substantially smaller than that in the non-relativistic limit (0.4 -1.6 pb). We also find a strong infrared sensitivity which manifests itself in a rather strong dependence on the mass for the t-channel gluons. The elementary cross section is then used in the Equivalent Photon Approximation (EPA) in the impact parameter space to calculate the cross section for 208 P b + 208 P b → 208 P b + J/ψJ/ψ + 208 P b reaction. Distributions in rapidity of the J/ψJ/ψ pair and invariant mass of the pair are shown.

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Section: A Box Diagramssupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

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The γγ→J/ψJ/ψ reaction and the J/ψJ/ψ pair production in exclusive ultraperipheral ultrarelativistic heavy ion collisions

Baranov

Cisek²,

Kłusek-Gawenda³

et al. 2013

Eur. Phys. J. C

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“…The description of double vector meson production in γ γ interactions at high energies has attracted the attention of several theoretical groups in the last years, with the cross section being estimated in different theoretical frameworks [60,61,[63][64][65][69][70][71][72][73][74][75][76][77][78][79][80], as, for instance, the solution of the BFKL equation and impact factors at leading and next-toleading orders. In particular, in Ref.…”

mentioning

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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“…This conclusion motivates us to review the analysis of other observables which could be measured at the ILC. One promising observable is double vector meson production in γγ collisions, which has attracted the attention of several theoretical groups in the last years, with the cross section being estimated in different theoretical frameworks [8][9][10][11][12][13][14][15][16], as, for instance, the solution of the BFKL equation and impact factors at leading and next-to-leading orders. In this paper we will estimate the total γ(Q 2 1 ) + γ(Q 2 2 ) → V 1 + V 2 cross-sections for V i = ρ, φ, J/ψ and Υ considering the improved treatment of the dipole -dipole cross section and the energy and virtuality dependencies of the total cross sections will be analyzed in detail.…”

Section: Introductionmentioning

confidence: 99%

Double vector meson production in the International Linear Collider

et al. 2015

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In this paper we study double vector meson production in γγ interactions at high energies and estimate, using the color dipole picture, the main observables which can be probed at the International Linear Collider (ILC). The total γ(Q 2 1 ) + γ(Q 2 2 ) → V1 + V2 cross-sections for Vi = ρ, φ, J/ψ and Υ are computed and the energy and virtuality dependencies are studied in detail. Our results demonstrate that the experimental analysis of this process is feasible at the ILC and it can be useful to constrain the QCD dynamics at high energies.

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DoubleJ/ψproduction at photon colliders

Cited by 21 publications

References 23 publications

The γγ→J/ψJ/ψ reaction and the J/ψJ/ψ pair production in exclusive ultraperipheral ultrarelativistic heavy ion collisions

The γγ→J/ψJ/ψ reaction and the J/ψJ/ψ pair production in exclusive ultraperipheral ultrarelativistic heavy ion collisions

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

Double vector meson production in the International Linear Collider

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