Resonance-reggeon and parton-hadron duality in strong interactions

J= photoproduction is studied in the framework of the analytic S-matrix theory. The differential and integrated elastic cross sections for J= photoproduction are calculated from a dual amplitude with Mandelstam analyticity. It is argued that, at low energies, the background, which is the low-energy equivalent of the high-energy diffraction, replaces the Pomeron exchange. The onset of the high-energy Pomeron dominance is estimated from the fits to the data.

show abstract

“…[14,15,17,23], and those of DAMA were studied in [24,25]. It should be noted however that at high Q 2 VMD may not be valid anymore.…”

Section: Discussionmentioning

confidence: 99%

DiffractiveJ/ψphotoproduction in a dual model

et al. 2007

View full text Add to dashboard Cite

show abstract

“…Measurements in the Coulomb-nuclear interference (CNI) region, −t ∼ 6.5 · 10 −4 GeV 2 , Θ min ∼ 3.5 µrad, (note that at SPS Θ min ∼ 120 µrad) will be be used to extract the value of the parameter ρ The extracted value of ρ may be affected by at least two phenomena. One is connected with the well known corrections [77] to the Coulomb-hadron phase [78] and the other one with the non-exponential behavior of the diffraction cone, known as the "fine structure of the Pomeron trajectory" [23][24][25][39][40][41][42]. Below, in Sec.…”

Section: On-line Luminosity Monitoringmentioning

confidence: 99%

“…[92]. To make the analysis complete, the Odderon contribution [23][24][25] as well as the nearby threshold singularity at t = 4m 2 π [39], should be also taken into account.…”

Section: On-line Luminosity Monitoringmentioning

confidence: 99%

See 1 more Smart Citation

Forward Physics at the Lhc: Elastic Scattering

Fiore

Jenkovszky

Orava

et al. 2009

Int. J. Mod. Phys. A

Self Cite

View full text Add to dashboard Cite

The following effects in the nearly forward ("soft") region of the LHC are proposed to be investigated:• At small |t| the fine structure of the cone (Pomeron) should be scrutinized: a) a break of the cone near t ≈ −0.1 GeV 2 , due to the two-pion threshold, and required by t-channel unitarity, and b) possible small-period oscillations between t = 0 and the dip region.• In measuring the elastic pp scattering and total pp cross section at the LHC, the experimentalists are urged to treat the total cross section σ t , the ratio ρ of real to imaginary part of the forward scattering amplitude, the forward slope B and the luminosity L as free parameters, and to publish model-independent results on dN/dt.• Of extreme interest are the details of the expected diffraction minimum in the differential cross section. Its position, expected in the interval 0.4 < −t < 1 GeV 2 at the level of about 10 −2 mb· GeV −2 ÷10 −1 mb· GeV −2 , cannot be predicted unambiguously, and its depth, i.e. the ratio of dσ/dt at the minimum to that at the subsequent maximum (about −t = 5 GeV 2 , which is about 5) is of great importance.• The expected slow-down with increasing |t| of the shrinkage of the second cone (beyond the dip-bump), together with the transition from an exponential to a power decrease in −t, will be indicative of the transition from "soft" to "hard" physics. Explicit models are proposed to help in quantifying this transition.• In a number of papers a limiting behavior, or saturation of the black disc limit (BDL), was predicted. This controversial phenomenon shows that the BDL may not be the ultimate limit, instead a transition from shadow to antishadow scattering may by typical of the LHC energy scale. 7 The rapidity coverage could be extended further by simple Forward Shower Counters (FSCs) placed at 60 to 140 meters from IP5.

show abstract

“…The unification of the asymptotic solutions is an ambitious goal of the theory, and duality may play here an important role, as shown in the "Road map" of Ref. [12] and in Fig. 3.…”

mentioning

confidence: 99%

Deeply virtual Compton scattering and generalized parton distributions

Fazio¹,

Fiore²,

Jenkovszky

2009

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. We present a comparison of a recently proposed model, which describes the Deeply Virtual Compton Scattering amplitude, to the HERA data. Keywords:Compton scattering, Regge poles, Pomeron, parton distributions PACS: 12.38. Bx, 12.39.St, Exclusive production of a real photon, a vector meson or lepton pairs via deeply virtual scattering, ep → eV p, where V stands generically for produced particles, is an interesting tool to investigate the diffractive properties of the Pomeron.The linear Regge-trajectory of the Pomeron is,where t is the squared four-momentum transferred at the proton vertex and Q 2 is the virtuality of the exchanged photon. The standard Regge pole parametrization of the scattering amplitude iswhere s = W 2 is the squared γ * p centre-of-mass energy, s 0 = 1 GeV 2 and B(t, Q 2 ) is related to the radius associated with the proton vertex. Models based on the Regge phenomenology have been proposed to describe the Deeply Virtual Compton Scattering (DVCS) amplitude [1,2,3,4]. DVCS measurements are an important source in extracting information about General Parton Distributions (GPDs). These distributions can offer a holographic picture of the nucleon.The DVCS data collected at the lepton-proton collider HERA can help to understand the properties of the Pomeron trajectory. There are many papers discussing in details the form and the values of the parameters of the Pomeron trajectory as well as their possible Q 2 dependence (for a recent review, see, e.g. [5]).In the present paper we compare the model described in Ref.[1] and applied in Ref.[6] to the high-energy data on DVCS collected by the H1 and ZEUS detectors at HERA [7,8,9]. The model makes use of a logarithmic Pomeron Trajectory. The scattering amplitude has the form [1,6]

show abstract

Resonance-reggeon and parton-hadron duality in strong interactions

Abstract: Abstract. By using the concept of duality between direct channel resonances and Regge exchanges we relate the small-and large-x behavior of the structure functions. We show that even a single resonance exhibits Bjorken scaling at large Q 2 .

Cited by 20 publications

References 17 publications

DiffractiveJ/ψphotoproduction in a dual model

DiffractiveJ/ψphotoproduction in a dual model

Forward Physics at the Lhc: Elastic Scattering

Deeply virtual Compton scattering and generalized parton distributions

Contact Info

Product

Resources

About