A multiparton model for pp / p$\bar{p}$ inelastic scattering

Beggio, P.C.

doi:10.1590/s0103-97332008000500012

Cited by 7 publications

(21 citation statements)

References 11 publications

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“…where σ n (s) is the n-particle topological cross section, with n σ n (s) = σ in (s). The connection between the multiplicity distribution and the DGM eikonal becomes complete using a phenomenological procedure referred to as geometrical or string approach [17][18][19][20][21], where the hadronic multiplicity P n (s) can be constructed in terms of elementary quantities related to microscopic processes. More specifically, the topological cross section is written as…”

Section: Inelastic Channel: the String Approachmentioning

confidence: 99%

“…In addiction, it has been assumed that the energy effectively employed for the production of particles in a given interaction is proportional to the eikonal [17][18][19][20][21][22]24]. It means that the eikonal may be interpreted as a measure of the effective overlap of two colliding matter distributions on the impact parameter plane.…”

Section: Inelastic Channel: the String Approachmentioning

confidence: 99%

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Cross sections, multiplicity and moment distributions at the LHC

Beggio¹,

Luna²

2014

Nuclear Physics A

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The unitarity of the S-matrix requires that the absorptive part of the elastic scattering amplitude receives contributions from both the inelastic and the elastic channels. We explore this unitarity condition in order to describe, in a connected way, hadron-hadron observables like the total and elastic differential cross sections, the ratio of the real to imaginary part of the forward scattering amplitude and the inclusive multiplicity distributions in full phase space, over a large range of energies. We introduce non-perturbative QCD effects in the forward scattering amplitude by using the infrared QCD effective charge dependent on the dynamical gluon mass. In our analysis we pay special attention to the theoretical uncertainties in the predictions due to this mass scale variation. We also present quantitative predictions for the H q moments at high energies. Our results reproduce the moment oscillations observed in experimental data, and are consistent with the behavior predicted by QCD.

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Section: Inelastic Channel: the String Approachmentioning

confidence: 99%

Section: Inelastic Channel: the String Approachmentioning

confidence: 99%

Cross sections, multiplicity and moment distributions at the LHC

Beggio¹,

Luna²

2014

Nuclear Physics A

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“…ψ (1) corresponds to the KNO form of the negative binomial distribution (NBD) (or gamma distribution) [12], √ s is the center-of-mass energy, < n > is the average multiplicity, z = n/ < n(s) > represents the usual KNO scaling variable, b is the impact parameter, Γ is the usual gamma function, χ I is the imaginary part of the complex eikonal function and ξ(s) is determined by usual normalization condition on P n [9]. The main points of the model are summarized as follows:…”

Section: A Model For P Nmentioning

confidence: 99%

“…Thus, phenomenological approaches are used as source of information for adequate theoretical developments. In [8], we have update and applied an existing phenomenological approach, referred to as Simple One String Model -SOSM [9], which allows simultaneous description of several experimental data from elastic and inelastic channels. This simple model is also able to predict P n from ISR to Collider energies (30.4 -900 GeV) without free parameters [10] [11].…”

Section: Introductionmentioning

confidence: 99%

“…In [8], we have update and applied an existing phenomenological approach, referred to as Simple One String Model -SOSM [9], which allows simultaneous description of several experimental data from elastic and inelastic channels. This simple model is also able to predict P n from ISR to Collider energies (30.4 -900 GeV) without free parameters [10] [11]. In addition, the model allows us to study the inelasticity in pp/pp reactions, for which experimental information is scarce [8].…”

Section: Introductionmentioning

confidence: 99%

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Oscillations of factorial cumulants to factorial moments ratio from an eikonal approach

Beggio

2013

Nuclear Physics A

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We study the factorial moments (Fq), the factorial cumulants (Kq) and the ratio of Kq to Fq (Hq = Kq/Fq) in pp/pp collisions using an updated approach, in which the multiplicity distribution is related to the eikonal function. The QCD inspired eikonal model adopted contains contributions of quark-quark, quark-gluon and gluon-gluon interactions. Our work shows that the approach can reproduce the collision energy dependence of the Fq moments, correctly predicts that the first minimum of the Hq lies around q = 5 and qualitatively reproduces the oscillations of the Hq moments, as shown in the experimental data and predicted by QCD at preasymptotic energy. The result of this study seems to indicate that the Hq oscillations are manifestation of semihard component in the multiparticle production process. Predictions for multiplicity distribution and Hq moments at the LHC energy of √ s = 14 TeV are presented.

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The U-Matrix geometrical model for multi-particle production in high-energy hadronic collisions

Oueslati,

Trabelsi

2024

J. High Energ. Phys.

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Inspired by the picture portraying the KNO scaling violation as an extension of the geometrical scaling violation, the current study proposes a phenomenological model for multi-particle production in hadron collisions based on the geometrical approach and using the U-Matrix unitarization scheme of the scattering amplitude. The model has been fine-tuned and all parameters have been derived from optimal fits to various hadronic multiplicity distributions data in p + $$ p\left(\overline{p}\right) $$ p p ¯ collisions across a broad range of energies. The results have revealed that our model furnishes a reasonable description of diverse multiplicity distributions at various energies. Besides, they have demonstrated a pronounced violation of the geometrical scaling, which eventually resulted in a significant violation of the KNO scaling. The study has also analyzed the higher-order moments of the multiplicity distribution. We have observed an unexpected overestimation of the fluctuations and correlations between final state particles with increasing energy, particularly above LHC energy. It is claimed that this overestimation is due to statistical fluctuations embedded in the U-matrix scheme. The findings of this study have shed light on the key role of the U-matrix scheme in the impact of collision geometry on multi-particle production processes at high energy.

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A multiparton model for pp / p$\bar{p}$ inelastic scattering

Cited by 7 publications

References 11 publications

Cross sections, multiplicity and moment distributions at the LHC

Cross sections, multiplicity and moment distributions at the LHC

Oscillations of factorial cumulants to factorial moments ratio from an eikonal approach

The U-Matrix geometrical model for multi-particle production in high-energy hadronic collisions

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