Central exclusive production at the LHC: Remarks by the organisers on an EMMI workshop

Ewerz, Carlo; Nachtmann, Otto; Schicker, Rainer

doi:10.48550/arxiv.1908.11792

Cited by 2 publications

(2 citation statements)

References 21 publications

(21 reference statements)

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“…The Pomeron carries quantum numbers of vacuum, so it is a colorless entity in QCD and reactions initiated by Pomerons are experimentally characterized by the "rapidity gap" events. At the Large Hadron Collider (LHC), investigations on CEP are very active [2,3]. Our focus on this study is the production of χ c and χ b within the two-gluon exchange formalism and non-relativistic approach for evaluating the P -wave quarkonium decays [4].…”

Section: Introductionmentioning

confidence: 99%

Central exclusive $χ_{c,b}$ production at high energy colliders and gluon saturation approach

Kopp,

Ducati,

Machado

2020

Preprint

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In this work we analyze the central exclusive production of χc and χ b at the LHC and Tevatron energies using the recent unintegrated parton distribution (UGDs) functions disposable by package TMDlib. We provide predictions for LHC using recent UGDs based in CCFM formalism. We also study the underlying uncertainties on this production like the the choice for the unintegrated gluon distribution and factorization scale. Moreover, based on the parton saturation model for the gluon distribution we propose analytical expressions for the rapidity distributions including the prompt production of J/ψγ and Υγ.

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Section: Introductionmentioning

confidence: 99%

Central exclusive $χ_{c,b}$ production at high energy colliders and gluon saturation approach

Kopp,

Ducati,

Machado

2020

Preprint

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“…There, questions of odderon searches were extensively discussed. Corresponding remarks and the link to the talks presented at this workshop can be found in [37].…”

Section: Introductionmentioning

confidence: 99%

Searching for the odderon in $pp \to pp K^{+}K^{-}$ and $pp \to pp μ^{+}μ^{-}$ reactions in the $ϕ(1020)$ resonance region at the LHC

Lebiedowicz,

Nachtmann,

Szczurek

2019

Preprint

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We explore the possibility of observing odderon exchange in the pp → ppK + K − and pp → ppµ + µ − reactions at the LHC. We consider the central exclusive production (CEP) of the φ(1020) resonance decaying into K + K − and µ + µ − . We compare the purely diffractive contribution (odderon-pomeron fusion) to the photoproduction contribution (photon-pomeron fusion). The theoretical results are calculated within the tensor-pomeron and vector-odderon model for soft reactions. We include absorptive corrections at the amplitude level. In order to fix the coupling constants for the photon-pomeron fusion contribution we discuss the reactions γp → ω p and γp → φp including φ-ω mixing. We compare our results for these reactions with the available data, especially those from HERA. Our coupling constants for the pomeron-odderon-φ vertex are taken from an analysis of the WA102 data for the pp → ppφ reaction. We show that the odderonexchange contribution significantly improves the description of the pp azimuthal correlations and the dP t "glueball-filter variable" dependence of φ CEP measured by WA102. To describe the lowenergy data more accurately we consider also subleading processes with reggeized vector-meson exchanges. However, they do not play a significant role at the LHC. We present predictions for two possible types of measurements: at midrapidity and with forward measurement of protons (relevant for ATLAS-ALFA or CMS-TOTEM), and at forward rapidities and without measurement of protons (relevant for LHCb). We discuss the influence of experimental cuts on the integrated cross sections and on various differential distributions. With the corresponding LHC data one should be able to get a decisive answer concerning the presence of an odderon-pomeron fusion contribution in single φ CEP.

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Central exclusive production at the LHC: Remarks by the organisers on an EMMI workshop

Cited by 2 publications

References 21 publications

Central exclusive $χ_{c,b}$ production at high energy colliders and gluon saturation approach

Central exclusive $χ_{c,b}$ production at high energy colliders and gluon saturation approach

Searching for the odderon in $pp \to pp K^{+}K^{-}$ and $pp \to pp μ^{+}μ^{-}$ reactions in the $ϕ(1020)$ resonance region at the LHC

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