Double parton scattering and the proton transverse structure at the LHC

Rinaldi, Matteo; Ceccopieri, Federico Alberto

doi:10.1007/jhep09(2019)097

Cited by 22 publications

(59 citation statements)

References 87 publications

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“…An ideal case is to look for a process in which the SPS contribution is suppressed. A few such examples are same-sign open charm [79], J/ψ+charm [79], Υ+charm [80], 5 and J/ψ + Υ [41,74] production. In order to avoid the complications from the final-state nuclear effects, we only take the pA collisions as an example here.…”

Section: Impact-parameter Dependent Nuclear Pdf From Dpsmentioning

confidence: 99%

Probing impact-parameter dependent nuclear parton densities from double parton scatterings in heavy-ion collisions

Shao

2020

Phys. Rev. D

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We propose a new method to determine the spatially or impact-parameter dependent nuclear parton distribution functions (nPDFs) using the double parton scattering (DPS) processes in highenergy heavy-ion (proton-nucleus and nucleus-nucleus) collisions. We derive a simple generic DPS formula in nuclear collisions by accommodating both the nuclear collision geometry and the spatially dependent nuclear modification effect, under the assumption that the impact-parameter dependence of nPDFs is only related to the nuclear thickness function. While the geometric effect is widely adopted, the impact of the spatially dependent nuclear modification on DPS cross sections has been overlooked so far, which can, however, be significant when the initial nuclear modification is large. In turn, the DPS cross sections in heavy-ion collisions can provide useful information on the spatial dependence of nPDFs. They can be, in general, obtained in minimum-bias nuclear collisions, featuring the virtue of independence of Glauber modeling.1 To the best of our knowledge, none of the existing DPS phenomenological applications in heavy-ion collisions [89][90][91][92][96][97][98][99][100][101][102][103][104] considers such an effect. 2 There are also a few attempts to obtain the spatial form of the nPDFs based on phenomenological models (see, e.g., ).

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Section: Impact-parameter Dependent Nuclear Pdf From Dpsmentioning

confidence: 99%

Probing impact-parameter dependent nuclear parton densities from double parton scatterings in heavy-ion collisions

Shao

2020

Phys. Rev. D

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“…Moreover, the DPS cross section depends on a new quantity called double parton distribution functions (dPFDs) which encode the probability of finding two partons, with given flavors, longitudinal momentum fractions (x 1 , x 2 ) and relative transverse distance d ⊥ [1,7,8]. If measured, dPDFs would therefore represent a novel tool to access the three-dimensional hadron structure [9,10]. In fact, dPDFs provide new fundamental information, complementary to those obtained by using generalised parton distribution functions (GPDs) [11].…”

Section: Introductionmentioning

confidence: 99%

“…It is therefore useful to estimate them at low momentum scales (∼ QC D ), for example by using quark models [12][13][14][15]. In addition to several general analyses on dPDFs [7,9,[16][17][18][19], a lattice QCD investigation on two-current correlations in the pion has been published very recently [20]. In the present analysis, we take advantage of the lattice data, to test quark model predictions for the pion dPDFs.…”

Section: Introductionmentioning

confidence: 99%

Double parton correlations in mesons within AdS/QCD soft-wall models: a first comparison with lattice data

Rinaldi

2020

Eur. Phys. J. C

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Double parton distribution functions (dPDFs), entering the double parton scattering (DPS) cross section, are unknown fundamental quantities encoding new interesting properties of hadrons. Here, the pion dPDFs are investigated within different holographic QCD quark models in order to access their basic features. Results of the calculations obtained within the AdS/QCD soft-wall approach, have been compared with predictions of lattice QCD evaluations of the pion two-current correlation functions. The present analysis confirms that double parton correlations, affecting dPDFs, are very important and not direct accessible from generalised parton distribution functions and electromagnetic form factors. The comparison between lattice data and quark model calculations unveils the relevance of the contributions of high partonic Fock states in the pion. Nevertheless, by using a complete general procedure, results of lattice QCD have been used, for the first time, to estimate the mean value of the so called $$\sigma _{eff}$$ σ eff , a relevant experimental observable for DPS processes. In addition, the results of the first calculations of the $$\rho $$ ρ meson dPDFs are discussed in order to make predictions.

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“…These are particularly interesting since they provide us with means to study parton correlations inside the proton (see e.g. [10,16,17]).…”

Section: Introductionmentioning

confidence: 99%

Prompt $${J/\psi }$$-pair production at the LHC: impact of loop-induced contributions and of the colour-octet mechanism

et al. 2019

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Prompt double-J/ψ production at high-energy hadron colliders can be considered as a golden channel to probe double parton scatterings (DPS) -in particular to study gluon-gluon correlations inside the proton-and, at the same time, to measure the distribution of linearly-polarised gluons inside the proton. Such studies however require a good control of both single and DPS in the respective regions where they are carried out. In this context, we have critically examined two mechanisms of single parton scatterings (SPS) that may be kinematically enhanced where DPS are thought to be dominant, even though they are either at higher orders in the strong-coupling or velocity expansion. First, we have considered a gauge-invariant and infrared-safe subset of the loop-induced contribution via Colour-Singlet (CS) transitions. We have found it to become the leading CS SPS contributions at large rapidity separation, yet too small to account for the data without invoking the presence of DPS yields. Second, we have surveyed the possible Colour-Octet (CO) contributions using both old and up-to-date non-perturbative long distance matrix elements (LDMEs). We have found that the pure CO yields crucially depend on the LDMEs. Among all the LDMEs we used, only two result into a visible modification of the NRQCD (CS+CO) yield, but only in two kinematical distributions measured by ATLAS, those of the rapidity separation and of the pair invariant mass. These modifications however do not impact the control region used for their DPS study.

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Double parton scattering and the proton transverse structure at the LHC

Cited by 22 publications

References 87 publications

Probing impact-parameter dependent nuclear parton densities from double parton scatterings in heavy-ion collisions

Probing impact-parameter dependent nuclear parton densities from double parton scatterings in heavy-ion collisions

Double parton correlations in mesons within AdS/QCD soft-wall models: a first comparison with lattice data

Prompt $${J/\psi }$$-pair production at the LHC: impact of loop-induced contributions and of the colour-octet mechanism

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