Exclusive vector meson production with leading neutrons in a saturation model for the dipole amplitude in mixed space

Amaral, J. T. de Santana; Becker, V. M.

doi:10.1103/physrevd.97.094026

Cited by 4 publications

(3 citation statements)

References 54 publications

(92 reference statements)

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“…In general we could use the flux from the light cone Fock state πn of a proton from the meson-cloud models [29] or recall the expression from triple-Regge diagrams which describe inclusive processes as ap → Xn with a = γ or p [30][31][32]. This flux parametrisation with dominant-pion exchange contribution has been used to explain hadron-hadron interactions and data from the H1 and ZEUS experiments [18,19,22] and in the earlier analysis in [14][15][16][17]. The flux factor is given by:…”

Section: The Pion Fluxmentioning

confidence: 99%

“…The colour dipole model provides an unified framework to study the inclusive, exclusive, and inclusive diffractive data [1][2][3][4][5][6][7][8][9][10] gathered in ep collisions and the inclusive particle production data in pp, pA, and AA collisions [11][12][13] at small x. Recently this framework has been extended to study the production of neutrons in very forward direction which carry a large fraction of longitudinal momentum (x L > 0.3) of the protons in ep collisions [14][15][16][17]. These are usually known as the leading neutrons.…”

Section: Introductionmentioning

confidence: 99%

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Investigating saturation effects and the virtual pion in leading neutron events at HERA with the dipole model

Kumar,

Toll

2022

Preprint

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We investigate events with very forward neutrons in ep collisions at HERA using impact parameter dependent colour dipole models bSat and bNonSat, with and without saturation. This is the first study of the leading neutron process deploying these models. The models prediction are compared with the available HERA measurements for 6 < Q 2 < 100 GeV 2 , 70 < W < 245 GeV . Our analysis shows that the models exhibit Feynman scaling, independent of Q 2 . Our results demonstrate that the W and Q 2 dependence of the cross section is independent of the presence of a forward neutron as predicted by limiting fragmentation hypothesis, which is a consequence of Feynman scaling itself. Thus, we infer that the HERA leading neutron production inclusive data is insensitive to saturation physics and these cross sections may not be able to distinguish gluon saturation effects in future ep colliders. We further demonstrate the validity of the hypothesis that the hadronic cross section is universal between pions and protons at small x, up to normalisation. We provide a good description of the pion structure function F LN 2 at small x. We also show that the observables in the exclusive diffractive measurements with a vector meson in the final state are more sensitive to saturation physics at small x than inclusive measurements. At last we provide a prediction for the t spectrum in exclusive vector meson production in the dipole model using Yukawa theory to model the virtual pion's spatial wave function.

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Section: The Pion Fluxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating saturation effects and the virtual pion in leading neutron events at HERA with the dipole model

Kumar,

Toll

2022

Preprint

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“…Posteriormente à nossa proposta original, o nosso formalismo foi utilizado na Ref [238]. para descrever os mesmos dados do HERA, mas desta vez, utilizando outro modelo de dinâmica não linear.…”

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Produção de nêutrons dominantes a altas energias

Pires¹

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À minha mãe, Loirinda, por sempre me incentivar a continuar estudando, e também, por ser a pessoa mais íntegra e mais guerreira que já conheci, sendo uma referência constante. Ao meu orientador, Fernando, pelos ensinamentos, pela segurança passada, pelo incentivo, pela camaradagem no dia a dia, pela compreensão, por viabilizar o meu desenvolvimento no meio acadêmico e por, mesmo estando numa relação academicamente hierárquica, sempre ter me tratado como um igual. Ao meu coorientador, Victor, por tantos ensinamentos durante toda a pós-graduação (sempre passados com empolgação!), pelo constante incentivo, pela compreensão, pela amizade, pelos auxílios nos mais variados aspectos e por ser um excelente guia no desbravamento da física de altas energias. Aos três grandes companheiros das madrugadas etílicas, Brenda, Bruno e Talita, pelos momentos de descontração e desabafo, os quais foram simplesmente essenciais durante o doutorado. À toda a minha família camaquense (nomes demais para citar!) que, mesmo pouco entendendo o que eu faço, sempre reconheceram a importância e me incentivaram na minha jornada até aqui. Aos amigos da república, em especial, Andre, Bassiro, Brenda, Bruno, Carlos, Eduardo, (os) Lucas, Naim, Níkolas e Riis, por contribuirem na manutenção de um ambiente tão descontraído. Aos membros do 3G, "Anão", "Gordo", "Torto", "Preto" e "Velho", pelos frequentes alívios cômicos, balbúrdia contida e besteirol nonsense , que tornaram o dia a dia muito mais leve durante esse período no IFUSP. Aos demais amigos que, pelas mais distintas formas, me ajudaram a manter a sanidade durante os últimos quatro anos, em especial,

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Investigating saturation effects and the virtual pion in leading neutron events at HERA with the dipole model

Kumar

Toll

2022

Phys. Rev. D

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Exclusive vector meson production with leading neutrons in a saturation model for the dipole amplitude in mixed space

Cited by 4 publications

References 54 publications

Investigating saturation effects and the virtual pion in leading neutron events at HERA with the dipole model

Investigating saturation effects and the virtual pion in leading neutron events at HERA with the dipole model

Produção de nêutrons dominantes a altas energias

Investigating saturation effects and the virtual pion in leading neutron events at HERA with the dipole model

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