Universal geometrical scaling for hadronic interactions

Andrés, Carlota; Moscoso, Alexis; Pajares, C.

doi:10.1016/j.nuclphysa.2013.02.013

Cited by 15 publications

(14 citation statements)

References 57 publications

(73 reference statements)

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“…For instance, in Ref. [28] the proton saturation scale Q 2 s,p is obtained from the multiplicities of charged hadrons in pp collisions by using local parton-hadron duality and geometric scaling property (similar investigations were done for pA [29] and AA collisions [30]). We present the probable region where the peaks occur, κ ≈ a × Q s,A (x IP ) (a is a constant of order of unity), and it was shown that the quantity κ 2 σ scaled presents universal behavior as a function of the scaling variable, τ = κ/Q s .…”

Section: Discussionmentioning

confidence: 99%

Investigating the diffractive gluon jet production in lepton-ion collisions

2020

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We study the diffractive jet production in electron-ion collisions in the kinematic region where the mass M X of the diffractive final state is larger than Q 2. Based on parton saturation framework, predictions are done for the kinematics of future or possible eA machines as the EIC, LHeC, HE-LHeC, and FCC-eA. We analyze the differential cross section as a function of jet (gluon) transverse momentum and from the experimental point of view this observable could be used to extract the saturation scale as a function of x IP .

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Section: Discussionmentioning

confidence: 99%

Investigating the diffractive gluon jet production in lepton-ion collisions

2020

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“…Recently, it has been shown that in pp collisions the p t spectra of charged particles exhibit geometrical scaling, which is also satisfied in nucleus-nucleus collisions [153,154]. Using proper normalizations it was shown that in any type of collision for any centrality and energy the different distributions approximately are lying on the same curve for low and moderate p t [155], namely…”

Section: Transverse Momentum Distributionsmentioning

confidence: 92%

De-confinement and clustering of color sources in nuclear collisions

et al. 2015

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A brief introduction of the relationship of string percolation to the Quantum Chromo Dynamics (QCD) phase diagram is presented. The behavior of the Polyakov loop close to the critical temperature is studied in terms of the color fields inside the clusters of overlapping strings, which are produced in high energy hadronic collisions. The non-Abelian nature of the color fields implies an enhancement of the transverse momentum and a suppression of the multiplicities relative to the non overlapping case. The prediction of this framework are compared with experimental results from the SPS, RHIC and LHC for pp and AA collisions. Rapidity distributions, probability distributions of transverse momentum and multiplicities, Bose-Einstein correlations, elliptic flow and ridge structures are used to evaluate these comparison.The thermodynamical quantities, the temperature, and energy density derived from RHIC and LHC data and Color String Percolation Model (CSPM) are used to obtain the shear viscosity to entropy density ratio (η/s). It was observed that the inverse of (η/s) represents the trace anomaly ∆ = (ε − 3P )/T 4 . Thus the percolation approach within CSPM can be successfully used to describe the initial stages in high energy heavy ion collisions * Corresponding author

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“…(20) as 200 MeV/c is adopted, one obtain κ 2 = 1.4 − 1.8. It is interesting to extract Q sat from other reaction such as pA [57] and A-A [58] collision and to discuss the relationship between the fluctuation of multiplicity and that of the saturation momentum. However, we plan to investigate those issues at some other opportunity.…”

Section: Summary and Concluding Remarksmentioning

confidence: 99%

Saturation momentum scale extracted from semi-inclusive transverse spectra in high-energy pp collisions

Osada

Kumaoka

2019

Phys. Rev. C

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Geometric scaling is well confirmed for transverse momentum distributions observed in protonproton collisions at LHC energies. We introduced multiplicity dependence on a saturation momentum of the geometrical scaling, assuming the scaling holds for semi-inclusive distributions as well as for inclusive distributions. The saturation momentum is usually given by Bjorken's x variable, but redefinition of the scaling variable can make the saturation momentum a function of collision energy W . We treat the energy as a free parameter (denoted W * to distinguish it from W ) and associate the energy-dependent saturation momentum Qsat(W * ) with particle number density. By using Qsat(W * ) for a scaling variable τ , we show semi-inclusive distributions can be geometrically scaled. i.e., all semi-inclusive spectra observed at W =0.90, 2.76 and 7.00 TeV overlap one universal function. The particle density dependences of mean transverse momentum pT for LHC energies scales in terms of Qsat(W * ). Furthermore, our model explains a scaling property of event-by-event pT fluctuation measure √ Cm/ pT at LHC energies for pp collisions, where Cm is two-particle transverse momentum correlator. Our analysis of the pT fluctuation makes possible to evaluate a non-perturbative coefficient of the gluon correlation function.

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Universal geometrical scaling for hadronic interactions

Cited by 15 publications

References 57 publications

Investigating the diffractive gluon jet production in lepton-ion collisions

Investigating the diffractive gluon jet production in lepton-ion collisions

De-confinement and clustering of color sources in nuclear collisions

Saturation momentum scale extracted from semi-inclusive transverse spectra in high-energy pp collisions

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