Central exclusive production in the STAR experiment at RHIC

Sikora, R.

doi:10.1063/1.4977142

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…The measurement of two charged pions in p p collisions was performed by the CDF collaboration at Tevatron [20]. Exclusive reactions are of particular interest since they can be studied in current experiments at the LHC by the ALICE, ATLAS, CMS [21], and LHCb collaborations, as well as by the STAR collaboration at RHIC [22,23]. In such experiments it is of great advantage for the theoretical analysis if the leading outgoing protons can be measured.…”

Section: Introductionmentioning

confidence: 99%

Towards a complete study of central exclusive production of K+K− pairs in proton-proton collisions within the tensor Pomeron approach

2018

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We present a study of the central exclusive production of the K + K − pairs in proton-proton collisions at high energies. We consider diffractive mechanisms including the K + K − continuum, the dominant scalar f 0 (980), f 0 (1500), f 0 (1710) and tensor f 2 (1270), f ′ 2 (1525) resonances decaying into the K + K − pairs. We include also photoproduction mechanisms for the non-resonant (Drell-Söding) and the φ(1020) resonance contributions. The theoretical results are calculated within the tensor-pomeron approach including both pomeron and reggeon exchanges. Predictions for planned or current experiments at RHIC and LHC are presented. We discuss the influence of the experimental cuts on the integrated cross section and on various differential distributions for outgoing particles. The distributions in two-kaon invariant mass, in a special "glueball filter variable", as well as examples of angular distributions in the K + K − rest frame are presented. We compare the φ(1020) and continuum photoproduction contributions to the f 0 (980) and continuum diffractive contributions and discuss whether the φ(1020) resonance could be extracted experimentally. For the determination of some model parameters we also include a discussion of K-nucleon scattering, in particular total cross sections, and of φ(1020) photoproduction.

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Section: Introductionmentioning

confidence: 99%

Towards a complete study of central exclusive production of K+K− pairs in proton-proton collisions within the tensor Pomeron approach

2018

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“…Also the STAR experiment at the Relativistic Heavy Ion Collider (RHIC) is equipped with such detectors that allow the measurement of forward protons. In this way, the non-exclusive background due to proton breakup could be rejected via the momentum balance constraint [17,18].…”

Section: Introductionmentioning

confidence: 99%

Central exclusive diffractive production of pp¯ pairs in proton-proton collisions at high energies

2018

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We consider the central exclusive production of the pp in the continuum and via resonances in protonproton collisions at high energies. We discuss the diffractive mechanism calculated within the tensorPomeron approach including Pomeron, Odderon, and Reggeon exchanges. The theoretical results are discussed in the context of existing WA102 and Intersecting Storage Rings experimental data, and predictions for planned or current experiments at the Relativistic Heavy Ion Collider and the LHC are presented. The distribution in y diff , the rapidity distance between the proton and antiproton, is particularly interesting. We find a dip at y diff ¼ 0 for the pp production, in contrast to the π þ π − and K þ K − production. We predict also the pp invariant-mass distribution to be less steep than for the pairs of pseudoscalar mesons. We argue that these specific differences for the pp production with respect to the pseudoscalar meson pair production can be attributed to the proper treatment of the spin of produced particles. We discuss asymmetries that are due to the interference of C ¼ þ1 and C ¼ −1 amplitudes of pp production. We have also calculated the cross section for the pp → ppΛΛ reaction. Here, the cross section is smaller, but the characteristic feature for dσ=dy diff is predicted to be similar to pp production. The presence of resonances in the pp channel may destroy the dip at y diff ¼ 0. This opens the possibility to study diffractively produced resonances. We discuss the observables suited for this purpose.

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“…The CDF Collaboration has analysed central exclusive pion pair production in proton-antiproton collisions at the TEVATRON energies of √ s = 0.9 and 1.96 TeV [1]. A physics programme of central exclusive production in proton-proton collisions is being pursued by the STAR Collaboration at RHIC [2]. Results from analyses of centrally produced exclusive two track events from Run I and II at the LHC are available from the AL-ICE [3], ATLAS [4], CMS [5] and LHCb [6] experiments.…”

Section: Introductionmentioning

confidence: 99%

Exclusive diffractive resonance production in proton–proton collisions at high energies

2018

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A model for exclusive diffractive resonance production in proton-proton collisions at high energies is presented. This model is able to predict double differential distributions with respect to the mass and the transverse momentum of the produced resonance in the mass region √ M 2 ≤5 GeV. The model is based on convoluting the Pomeron distribution in the proton with the Pomeron-Pomeron-meson total cross section. The Pomeron-Pomeron-meson cross section is saturated by direct-channel contributions from the Pomeron as well as from two different f trajectories, accompanied by the isolated f 0 (500) resonance dominating the √ M 2 ≤ 1 GeV region. A slowly varying background is taken into account.

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Central exclusive production in the STAR experiment at RHIC

Cited by 5 publications

References 6 publications

Towards a complete study of central exclusive production of K+K− pairs in proton-proton collisions within the tensor Pomeron approach

Towards a complete study of central exclusive production of K+K− pairs in proton-proton collisions within the tensor Pomeron approach

Central exclusive diffractive production of pp¯ pairs in proton-proton collisions at high energies

Exclusive diffractive resonance production in proton–proton collisions at high energies

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