Phenomenological NLO analysis of η production at the LHC in the collider and fixed-target modes

Feng, Yu; He, J.; Lansberg, Jean-Philippe; Shao, Hua-Sheng; Usachov, A.; Zhang, Hongfei

doi:10.1016/j.nuclphysb.2019.114662

Cited by 28 publications

(25 citation statements)

References 67 publications

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“…For the case of the KMR UGD, it has recently been shown in [47], that it includes effectively also higher order corrections of the collinear factorization approach. In this sense should give within our approach a result similar to that found recently in the NLO approach [22] at not too small transverse momenta. In contrast to the collinear NLO approach in our approach we can go to very small transverse momenta close to p T = 0.…”

Section: Unintegrated Gluon Distributionssupporting

confidence: 89%

See 1 more Smart Citation

Prompt hadroproduction of ηc(1S, 2S) in the kT-factorization approach

Babiarz

Pasechnik

Schäfer

et al. 2020

J. High Energ. Phys.

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In this work, we present a thorough analysis of η c (1S, 2S) quarkonia hadroproduction in k ⊥ -factorisation in the framework of the light-front potential approach for the quarkonium wave function. The off-shell matrix elements for the g * g * η c (1S, 2S) vertices are derived. We discuss the importance of taking into account the gluon virtualities. We present the transverse momentum distributions of η c for several models of the unintegrated gluon distributions. Our calculations are performed for four distinct parameterisations for the cc interaction potential consistent with the meson spectra. We compare our results for η c (1S) to measurements by the LHCb collaboration and present predictions for η c (2S) production.

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Section: Unintegrated Gluon Distributionssupporting

confidence: 89%

“…Previously, the prompt η c (1S) production was discussed in various factorization approaches: collinear factorization [18][19][20][21][22], the TMD-factorization with transverse momentum dependent distributions of on-shell gluons, and on-shell matrix elements [23,24], and the k T -factorization in ref. [25].…”

Section: Jhep02(2020)037mentioning

confidence: 99%

Prompt hadroproduction of ηc(1S, 2S) in the kT-factorization approach

Babiarz

Pasechnik

Schäfer

et al. 2020

J. High Energ. Phys.

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“…The p T dependence of the prompt cross-section ratio is found to be linear with a slope of 0.22 ± 0.11 GeV −1 . While the integrated cross-section is in good agreement with the colour-singlet model prediction [32], a hint of a difference between the J/ψ and η c slopes motivates the extension of the measurement to larger p T values. A larger measured slope with respect to the prediction from Ref.…”

Section: Results and Discussion On The η C Productionsupporting

confidence: 62%

“…The LHCb collaboration measured the prompt η c production cross-section in proton-proton collisions at centre-of-mass energies of √ s = 7 and 8 TeV [18] to be below the predictions based on J/ψ prompt production data [19][20][21][22][23], which motivated several groups to revisit the theoretical approach [24][25][26][28][29][30][31]. A study of the η c prompt production at √ s = 13 TeV provides a further important test for theories predicting the J/ψ and η c hadroproduction cross-sections and the J/ψ polarisation [32].…”

Section: Introductionmentioning

confidence: 99%

Measurement of the $${\eta _{c}} (1S)$$ production cross-section in $$p $$ $$p $$ collisions at $$\sqrt{s} = 13$$ $$\, \text {TeV}$$

et al. 2020

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Using a data sample corresponding to an integrated luminosity of 2.0 fb −1 , collected by the LHCb experiment, the production of the η c (1S) state in proton-proton collisions at a centre-of-mass energy of √ s = 13 TeV is studied in the rapidity range 2.0 < y < 4.5 and in the transverse momentum range 6.5 < p T < 14.0 GeV. The cross-section for prompt production of η c (1S) mesons relative to that of the J/ψ meson is measured using the p p decay mode and is found to be σ η c (1S) /σ J/ψ = 1.69 ± 0.15 ± 0.10 ± 0.18. The quoted uncertainties are, in order, statistical, systematic and due to uncertainties on the branching fractions of the J/ψ → p p and η c → p p decays. The prompt η c (1S) production cross-section is determined to be σ η c (1S) = 1.26 ± 0.11 ± 0.08 ± 0.14 µb, where the last uncertainty includes that on the J/ψ meson cross-section. The ratio of the branching fractions of b-hadron decays to the η c (1S) and J/ψ states is measured to be B b→η c X /B b→J/ψ X = 0.48 ± 0.03 ± 0.03 ± 0.05, where the last uncertainty is due to those on the branching fractions of the J/ψ → p p and η c → p p decays. The difference between the J/ψ and η c (1S) masses is also determined to be 113.0 ± 0.7 ± 0.1 MeV, which is the most precise single measurement of this quantity to date.

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“…The most famous one of those is the J/ψ polarization puzzle. In the last decade, many processes have been calculated up to QCD next-to-leading order (NLO), including the J/ψ [17][18][19][20][21][22][23][24][25][26][27] and the η c [28] production in e + e − annihilation, the J/ψ photoproduction in e + e − [29] and ep [30][31][32][33][34][35][36][37] collisions, the ψ [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57], η c [58][59][60][61][62], and χ c [63][64][65]…”

Section: Jhep10(2019)234mentioning

confidence: 99%

Statistical analysis of the azimuthal asymmetry in the J/𝜓 leptoproduction in unpolarized ep collisions

Zhang

Sang

Yan

2019

J. High Energ. Phys.

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In this paper, we study the azimuthal asymmetry in the J/ψ leptoproduction in unpolarized ep collisions. There are two independent azimuthal asymmetry modulations, namely cos(ψ) and cos(2ψ), where ψ is the azimuthal angle of the lepton scattering plane with respect to the hadron-interacting plane. We calculate the two modulations as functions of four kinematic variables, and find that they provide a very good laboratory to distinguish several models describing the heavy quarkonium production, including the color-singlet (CS) model, the nonrelativistic QCD (NRQCD). In addition, this process can be used to test the magnitude of the 1 S [8] 0 long-distance matrix element, which is extraordinarily large from various phenomenological extraction. In order to make definite conclusions, we restrict our calculation in a specific kinematic region, where the CS and CO mechanisms can be distinguished by scrutinizing the values of the cos(ψ) modulation, while the 1 S [8] 0 dominance picture can be tested by measuring the values of the cos(2ψ) modulation. Calculating their values and carrying out a meticulous statistical analysis, we find that at an integrated luminosity L = 1000pb −1 , the statistical uncertainties of the two quantities are small enough to tell the three models apart. When this experiment is implemented at the future ep colliders such as the EIC, crucial information for the J/ψ production mechanism might be discovered.

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Phenomenological NLO analysis of η production at the LHC in the collider and fixed-target modes

Cited by 28 publications

References 67 publications

Prompt hadroproduction of ηc(1S, 2S) in the kT-factorization approach

Prompt hadroproduction of ηc(1S, 2S) in the kT-factorization approach

Measurement of the $${\eta _{c}} (1S)$$ production cross-section in $$p $$ $$p $$ collisions at $$\sqrt{s} = 13$$ $$\, \text {TeV}$$

Statistical analysis of the azimuthal asymmetry in the J/𝜓 leptoproduction in unpolarized ep collisions

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