Photoproduction of π + π − pairs in a model with tensor-pomeron and vector-odderon exchange

Bolz, A. E.; Ewerz, Carlo; Maniatis, Markos; Nachtmann, Otto; Sauter, M.; Schöning, A.

doi:10.1007/jhep01(2015)151

Cited by 44 publications

(75 citation statements)

References 68 publications

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“…Various reference systems are commonly used; see e.g. [35] for a discussion of such systems for the γp → π + π − p reaction. For the Collins-Soper system [36,37] for the reaction (2.1) we set the unit vectors defining the axes as follows:…”

Section: Formalismmentioning

confidence: 99%

Extracting the Pomeron-Pomeron- f2(1270) coupling in the pp→ppπ+

2020

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We discuss how to extract the pomeron-pomeron-f 2 (1270) (PP f 2 (1270)) coupling within the tensor-pomeron model. The general PP f 2 (1270) coupling is a combination of seven basic couplings (tensorial structures). To study these tensorial structures we propose to measure the central-exclusive production of a π + π − pair in the invariant mass region of the f 2 (1270) meson. An analysis of angular distributions in the π + π − rest system, using the Collins-Soper (CS) and the Gottfried-Jackson (GJ) frames, turns out to be particularly relevant for our purpose. For both frames the cos θ π + and φ π + distributions are discussed. We find that the azimuthal angle distributions in these frames are fairly sensitive to the choice of the PP f 2 coupling. We show results for the resonance case alone as well as when the dipion continuum is included. We show the influence of the experimental cuts on the angular distributions in the context of dedicated experimental studies at RHIC and LHC energies. Absorption corrections are included for our final distributions.

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Section: Formalismmentioning

confidence: 99%

Extracting the Pomeron-Pomeron- f2(1270) coupling in the pp→ppπ+

2020

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“…Recent studies on soft high-energy scattering solve this problem in terms of effective propagators and vertices for the Pomeron exchange [16]. Within this model, the Pomeron exchange is decribed as an effective rank-two tensor exchange [17,18].…”

Section: Central Productionmentioning

confidence: 99%

Resonance production in Pomeron-Pomeron collisions at the LHC

Schicker¹,

Fiore²,

Jenkovszky³

2016

Proceedings of XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2016)

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A Regge pole model for Pomeron-Pomeron total cross section in the resonance region √ M 2 ≤ 5 GeV is presented. The 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. The calculated PomeronPomeron total cross section cannot be measured directly, but is an essential part of central diffractive processes. In preparation of future calculations of central resonance production at the hadron level, and corresponding measurements at the LHC, we normalize the Pomeron-Pomeron cross section at large masses σ P P t ( √ M 2 → ∞) ≈ 1 mb as suggested by QCD-motivated estimates.

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“…In [11] the tensor pomeron was introduced for soft reactions and many of its properties were derived from comparisons with experiment. Further applications of the tensorpomeron concept were given for photoproduction of pion pairs in [13] and for a number of exclusive central-production reactions in [14,15,16,17,18,19,20]. In [21] the helicity structure of small-|t| proton-proton elastic scattering was calculated in three models for the pomeron: tensor, vector, and scalar.…”

Section: Introductionmentioning

confidence: 99%

Tensor Pomeron and low- x deep inelastic scattering

et al. 2019

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The tensor-pomeron model is applied to low-x deep-inelastic lepton-nucleon scattering and photoproduction. We consider c. m. energies in the range 6 -318 GeV and Q 2 < 50 GeV 2 . In addition to the soft tensor pomeron, which has proven quite successful for the description of soft hadronic high-energy reactions, we include a hard tensor pomeron. We also include f 2 -reggeon exchange which turns out to be particularly relevant for real-photon-proton scattering at c. m. energies in the range up to 30 GeV. The combination of these exchanges permits a description of the absorption cross sections of real and virtual photons on the proton in the same framework. In particular, a detailed comparison of this two-tensor-pomeron model with the latest HERA data for x < 0.01 is made. Our model gives a very good description of the transition from the small-Q 2 regime where the real or virtual photon behaves hadron-like to the large-Q 2 regime where hard scattering dominates. Our fit allows us, for instance, a determination of the intercepts of the hard pomeron as 1.3008 ( +73 −84 ), of the soft pomeron as 1.0935 ( +76 −64 ), and of the f 2 reggeon. We find that in photoproduction the hard pomeron does not contribute within the errors of the fit. We show that assuming a vector instead of a tensor character for the pomeron leads to the conclusion that it must decouple in real photoproduction.

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Photoproduction of π + π − pairs in a model with tensor-pomeron and vector-odderon exchange

Cited by 44 publications

References 68 publications

Extracting the Pomeron-Pomeron- f2(1270) coupling in the pp→ppπ+

Extracting the Pomeron-Pomeron- f2(1270) coupling in the pp→ppπ+

Resonance production in Pomeron-Pomeron collisions at the LHC

Tensor Pomeron and low- x deep inelastic scattering

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