Exclusive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mi>n</mml:mi><mml:mi>n</mml:mi><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>reaction at LHC and RHIC

Lebiedowicz, Piotr; Szczurek, Antoni

doi:10.1103/physrevd.83.076002

Cited by 26 publications

(29 citation statements)

References 49 publications

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“…2 In the past we have studied exclusive pion/kaon pairs in the pp → ppπ + π − [15,16], pp → nnπ + π + [17] and pp → ppK + K − [18] processes. There pomeron-pomeron and pomeron-reggeon exchanges are the dominant mechanisms.…”

Section: Sketch Of Formalismmentioning

confidence: 99%

Diffractive mechanisms in pp\rightarrow pp pi0 reaction at high energies

Lebiedowicz¹

2013

Proceedings of XXI International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS 2013)

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We present a study of exclusive production of π 0 meson in proton-proton collisions at high energies. Both diffractive bremsstrahlung (Drell-Hiida-Deck type model), photon-photon, photonomega and photon-odderon exchange mechanisms are included in the calculation. The π 0 -bremsstrahlung contribution dominates at large (forward, backward) pion rapidities and contributes at small π 0 p invariant mass and could be therefore misinterpreted as the Roper resonance N * (1440). Large cross sections of the order of mb are predicted. We predict strong dependence of the slope in t (squared four-momentum transfer between ingoing and outgoing proton) on the mass of the supplementary excited π 0 p system. At high energy and midrapidity, the photonphoton contribution dominates over the diffractive components, however, the corresponding cross section is rather small. The photon-odderon and odderon-photon contributions are included in addition and first estimates (upper limits) of their contributions are presented. We suggest a search for the odderon contribution at midrapidity and at p ⊥,π 0 ∼ 0.5 GeV. Our predictions are ready for verification at LHC. The bremsstrahlung mechanisms discussed here contribute also to the pp → p(nπ + ) reaction. Both channels give a sizable contribution to the low-mass single diffractive cross section and must be included in extrapolating the measured experimental single diffractive cross section. XXI International Workshop on Deep-Inelastic Scattering and Related PoS(DIS 2013)305Diffractive mechanisms in pp → ppπ 0 reaction at high energies Piotr LEBIEDOWICZ (a)IP (q2) Figure 1: Diagrams of the π 0 -bremsstrahlung amplitudes driven by the pomeron (IP) exchange in the ppcollisions: (a) pion exchange, (b) proton exchange, and (c) direct production.

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Section: Sketch Of Formalismmentioning

confidence: 99%

Diffractive mechanisms in pp\rightarrow pp pi0 reaction at high energies

Lebiedowicz¹

2013

Proceedings of XXI International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS 2013)

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“…No differential distributions for the exclusive bremsstrahlung have been discussed. 2 The exclusive pp → nnπ + π + [8] can be also measured with the help of the ZDCs. Very large cross sections has been found which is partially due to interference of a few mechanisms.…”

Section: Sketch Of Formalismmentioning

confidence: 99%

Exclusive diffractive photon bremsstrahlung at high energies

Lebiedowicz

Szczurek

2013

Proceedings of XXI International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS 2013)

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We discuss the pp → ppγ reaction at the LHC. We consider diffractive classical bremsstrahlung mechanisms including effects of non point-like nature of protons. In addition, we take into account (vector meson)-pomeron, photon-pion as well as photon-pomeron exchange processes for the first time in the literature. The integrated diffractive bremsstrahlung cross section (E γ > 100 GeV) is only of the order of µb. We try to identify regions of the phase space where one of the mechanisms dominates. The classical bremsstrahlung dominates at large forward/backward photon pseudorapidities, close to the pseudorapidities of scattered protons. In contrast, the photon-pomeron (pomeron-photon) mechanism dominates at midrapidities but the related cross section is rather small. In comparison the virtual-omega-rescattering mechanism contributes at smaller angles of photons (larger photon rapidities).

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“…For exclusive production of other mesons see e.g. [18,19,20], where mainly the non-central processes were discussed.…”

Section: Introductionmentioning

confidence: 99%

Central Exclusive Production of Pion Pairs in Proton--(anti)Proton Collisions

Lebiedowicz¹,

Szczurek²

2015

Acta Phys. Pol. B Proc. Suppl.

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We present our results for exclusive pp → ppπ + π − or pp → ppπ + π − processes at high energies. We discuss the role of new additional absorption corrections in the non-resonant Lebiedowicz-Szczurek model mediated by the pomeron and reggeon exchanges. We discuss also the role of the ρ 0 and the Drell-Söding photoproduction mechanism. We compare our predictions with recent experimental results obtained by the STAR and CDF Collaborations. We present predictions for the ALICE, ATLAS and CMS experiments. Differential distributions in invariant two-pion mass and twodimensional distributions in proton-proton relative azimuthal angle and transverse momentum of one of the protons are presented.

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Exclusivepp→nnπ+π+reaction at LHC and RHIC

Cited by 26 publications

References 49 publications

Diffractive mechanisms in pp\rightarrow pp pi0 reaction at high energies

Diffractive mechanisms in pp\rightarrow pp pi0 reaction at high energies

Exclusive diffractive photon bremsstrahlung at high energies

Central Exclusive Production of Pion Pairs in Proton--(anti)Proton Collisions

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