6,163 research outputs found

    Impact of the inelastic proton -- nucleus cross section on the prompt neutrino flux

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    The description of the inelastic proton -- nucleus cross section at very high energies is still an open question. The current theoretical uncertainty has direct impact on the predictions of the cosmic ray and neutrino physics observables. In this paper we consider different models for the treatment of σinelpA\sigma_{inel}^{pA}, compare its predictions at ultrahigh cosmic ray energies and estimate the prompt neutrino flux at the neutrino energies that have been probed by the IceCube Observatory. We demonstrate that depending of the model used to describe σinelpA\sigma_{inel}^{pA}, the predictions for the prompt neutrino flux can differ by a factor of order of three. Such result demonstrate the importance of a precise measurement of the inelastic proton -- nucleus cross section at high energies.Comment: 5 pages, 3 figures; v2: corrected the range of horizontal axis in figure 1. Matches the version published in Eur. Phys. J.

    The Phillips - Barger model for the elastic cross section and the Odderon

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    Inspired by the recent TOTEM data for the elastic proton -- proton (pppp) scattering at s=\sqrt{s} = 8 and 13 TeV, we update previous studies of the differential cross sections using the Phillips -- Barger (PB) model, which parametrizes the amplitude in terms of a small number of free parameters. We demonstrate that this model is able to describe the recent pppp data on a statistically acceptable way. Additionally, we perform separate fits of the pppp data for each center - of - mass energy and propose a parametrization for the energy dependence of the parameters present in the PB model. As a consequence, we are able to present the PB predictions for the elastic proton - proton cross section at s=546\sqrt{s} = 546 GeV and 1.81.8 TeV, which are compared with the existing antiproton -- proton (pˉp\bar{p}p) data. We show that the PB predictions, constrained by the pppp data, are not able to describe the pˉp\bar{p}p data. In particular, the PB model predicts a dip in the differential cross section that is not present in the pˉp\bar{p}p data. Such result suggests the contribution of the Odderon exchange at high energies.Comment: 6 pages, 4 tables, 2 figures, results updated, matches published versio

    Nuclear Heavy Quark Photoproduction in a Saturation Model

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    We calculate the nuclear inclusive and diffractive cross sections for heavy quark photoproduction within a phenomenological saturation approach. The nuclear cross section is obtained by the extension of the saturation model through Glauber-Gribov formalism. We predict large nuclear heavy quark cross section at LHC energies.Comment: 14 pages, 6 figures. Version to be published in Eur. Phys. J.

    Diffractive photoproduction of Z^0 bosons in coherent interactions at CERN-LHC

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    The exclusive Z0Z^0 photoproduction at high energies in γp(A)\gamma p (A), ppp p and AAAA collisions is investigate within the color dipole formalism. We generalize the description of the deeply virtual compton scattering (DVCS) process, which describe quite well the HERA data, for the production of Z0Z^0 bosons and estimate the total cross section for the exclusive process γ∗h→Z0h\gamma^* h\to Z^0 h (h=p,Ah=p,A) for different energies, photon virtualities and atomic numbers. As hadrons at collider energies are a source of Weizs\"{a}cker - Williams photons, we consider electromagnetic interactions in hadron-hadron collisions at Tevatron and LHC energies and estimate the rapidity distribution and total cross section for Z0Z^0 production in the hh→hZ0hh h\to h Z^0 h process. This is the first estimation for such a process in literature. It can allow us to study, for instance, the physics of hadronic Z0Z^0 decays in a clean environment characterized by two rapidity gaps. Our results indicate that the experimental analyzes of this process could be feasible in pppp but the physics scenario for AAAA collisions is not promising.Comment: 6 pages, 2 figures, 1 table; The erroneus additional factor of 2π2\pi in the normalization of the cross sections is removed. Figures and table are update

    Coherent photon-hadron interactions in pA collisions: Small-x physics after HERA

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    In this letter we study the photoproduction of heavy quarks and vector mesons in the coherent proton-nucleus (pA) interactions for RHIC and LHC energies and analyze if these processes can be used to determine the QCD dynamics at high energies. The integrated cross section and rapidity distribution are estimated using the Color Glass Condensate (CGC) formalism. A comparison with the linear dynamics predictions is also presented. Our results indicate that the nonlinear dynamics can be proven in those reactions, which are well suited for studing saturation effects.Comment: 5 pages, 3 figures. Version to be published in Physical Review

    The QCD Pomeron in Ultraperipheral Heavy Ion Collisions: II. Heavy Quark Production

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    The heavy quark production in ultraperipheral heavy ion collisions is investigated, in particular we focus on the results from the coherent interactions given by the two-photon process. One addresses the heavy quark total cross sections at photon level considering the saturation model and the BFKL dynamics in the color dipole picture. The corresponding cross sections at nuclear level are presented. It is verified that the QCD dynamics implies an enhancement of the cross section in comparison with previous calculations.Comment: 16 pages, 7 figures. Version to be published in Eur. Phys. J.
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