Sivers effect in inelastic 
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 photoproduction in 
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 collision in color octet model

Rajesh, Sangem; Kishore, R.; Mukherjee, Asmita

doi:10.1103/physrevd.98.014007

Cited by 48 publications

(41 citation statements)

References 79 publications

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“…Moreover, J/ψ production in both ep [12][13][14][15] and pp collisions [12,[16][17][18][19] has been proposed lately as a tool to access gluon TMDs. Similar studies have also been carried out within the so-called generalized parton model approach [20][21][22][23][24][25][26][27]. From the experimental point of view, these reactions should have a very clean signature due to the large branching ratio of the J/ψ leptonic decay modes.…”

Section: Jhep09(2020)040mentioning

confidence: 90%

J/ψ meson production in SIDIS: matching high and low transverse momentum

Boer

D’Alesio

Murgia

et al. 2020

J. High Energ. Phys.

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We consider the transverse momentum spectrum and the cos 2φ azimuthal distribution of J/ψ mesons produced in semi-inclusive, deep-inelastic electron-proton scattering, where the electron and the proton are unpolarized. At low transverse momentum, we propose factorized expressions in terms of transverse momentum dependent gluon distributions and shape functions. We show that our formulae, at the order α s , correctly match with the collinear factorization results at high transverse momentum. The latter are computed at the order α 2 s in the framework of nonrelativistic QCD (NRQCD), with the inclusion of the intermediate 3 S [1] 1 color-singlet Fock state, as well as the subleading color-octet ones that are relatively suppressed by a factor v 4 in the NRQCD velocity parameter v. We show that the 1 S [8] 0 and 3 P [8] J (J = 0, 1, 2) contributions diverge in the small transverse momentum region and allow us to determine the perturbative tails of the shape functions, which carry the same quantum numbers. These turn out to be identical, except for the overall magnitude given by the appropriate NRQCD long distance matrix element.

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Section: Jhep09(2020)040mentioning

confidence: 90%

J/ψ meson production in SIDIS: matching high and low transverse momentum

Boer

D’Alesio

Murgia

et al. 2020

J. High Energ. Phys.

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“…While most of the literature deals with the quark Sivers function f ⊥q 1T (x, k ⊥ ), there is a growing interest in the gluon Sivers function f ⊥g 1T (x, k ⊥ ) and its possible manifestation at RHIC and the future Electron-Ion Collider (EIC) and AFTER@LHC [5][6][7][8][9][10][11][12][13][14][15][16][17][18] (see also a review [19]). On general grounds, one expects that the gluon Sivers function is an important or even dominant source of SSA for the production of high mass states such as D-mesons, J/ψ's or dijets.…”

Section: Introductionmentioning

confidence: 99%

Computing the gluon Sivers function at small-x

2019

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We compute the gluon Sivers function f ⊥g 1T (x, k ⊥ ) of the transversely polarized nucleon at small-x by exploiting the known connection between the dipole gluon Sivers function and the Odderon. We numerically solve the evolution equation for the Odderon both in the linear and nonlinear regimes. While we find that the x and k ⊥ dependences of the Sivers function do not factorize as a result of the quantum evolution, factorization breaking is not numerically significant, and is much milder than what one expects in the case of unpolarized TMDs. We also point out the possibility that, due to the presence of a node in the Sivers function, single spin asymmetry for open charm production in semi-inclusive deep inelastic scattering flips signs as the transverse momentum of D-mesons is varied. This can be tested at the future Electron-Ion Collider.

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“…1 drop much faster than the color-octet channels 1 S [8] 0 and 3 P 1 gives the low one. Certain processes for example diffraction [77] and fragmentation [78,79] can also contribute to p J/ψ T distribution at small p J/ψ T and with very small total cross section, respectively. These two processes have not been taken into account and will be studied in our future work.…”

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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Sivers effect in inelastic J/ψ photoproduction in ep↑ collision in color octet model

Cited by 48 publications

References 79 publications

J/ψ meson production in SIDIS: matching high and low transverse momentum

J/ψ meson production in SIDIS: matching high and low transverse momentum

Computing the gluon Sivers function at small-x

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

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