Exclusive production of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ω</mml:mi></mml:math>meson in proton-proton collisions at high energies

Cisek, Anna; Lebiedowicz, Piotr; Schäfer, Wolfgang; Szczurek, Antoni

doi:10.1103/physrevd.83.114004

Cited by 27 publications

(40 citation statements)

References 79 publications

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“…The dominant diffractive bremsstrahlung mechanisms for the exclusive pp → ppπ 0 reaction 1 The exclusive pion production mechanism is similar to pp → ppω [2] and pp → ppγ [3] processes. 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.…”

Section: Sketch Of Formalismmentioning

confidence: 99%

“…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%

“…The pp → ppπ 0 process can be measured with the help of the forward detectors at the LHC. 2 In [8,9] a study of pseudoscalar mesons produced centrally by the WA102 Collaboration at √ s = 29.1 GeV was performed. The results show that the η and η ′ mesons appear to have a similar production mechanism which considerably differs from that for the π 0 production [8].…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Sketch Of Formalismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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 shall try to identify the region of the phase space where one can expect a dominance of one of the processes through detailed studies of several differential distributions. The exclusive photon production mechanism is similar to pp → ppω [2] and pp → ppπ 0 [3] processes. As discussed in the past the dominant hadronic bremsstrahlung-type mechanism is the Drell-Hiida-Deck mechanism [4] for diffractive production of πN final states (for a nice review we refer to [5] and references therein).…”

Section: Introductionmentioning

confidence: 99%

“…The photons radiated off the initial and final state protons can be seen by the Zero Degree Calorimeters (ZDCs) [7] in the pseudorapidity region |η| > 8.5 and 8.3 at the CMS and ATLAS, respectively. 2 The scattered protons can be tagged e.g. by the ALFA detectors at ATLAS (see [9]) or TOTEM at CMS.…”

Section: Introductionmentioning

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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Exclusive central diffractive production of scalar and pseudoscalar mesons; tensorial vs. vectorial pomeron

2014

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We discuss consequences of the models of "tensorial pomeron" and "vectorial pomeron" for exclusive diffractive production of scalar and pseudoscalar mesons in proton-proton collisions. Diffractive production of f 0 (980), f 0 (1370), f 0 (1500), η, and η ′ (958) mesons is discussed. Different pomeronpomeron-meson tensorial coupling structures are possible in general. In most cases two lowest orbital angular momentum -spin couplings are necessary to describe experimental differential distributions. For f 0 (980) and η production reggeon-pomeron, pomeron-reggeon, and reggeon-reggeon exchanges are included in addition, which seems to be necessary at relatively low energies. The theoretical results are compared with the WA102 experimental data. Correlations in azimuthal angle between outgoing protons, distributions in rapidities and transverse momenta of outgoing protons and mesons, in a special "glueball filter variable", as well as some two-dimensional distributions are presented. We discuss differences between results of the vectorial and tensorial pomeron models. We show that high-energy central production, in particular of pseudoscalar mesons, could provide crucial information on the spin structure of the soft pomeron.

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Exclusive production ofωmeson in proton-proton collisions at high energies

Cited by 27 publications

References 79 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

Exclusive central diffractive production of scalar and pseudoscalar mesons; tensorial vs. vectorial pomeron

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