Forward physics at the LHC; Elastic scattering

R. Fiore, L. Jenkovszky, R. Orava, E. Predazzi, A. Prokudin, O. Selyugin

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

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 GeV2, 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 σt, the ratio ρ of real to imaginary part of the forward scattering amplitude, the forward slope B and the luminosity ${\mathcal L}$ 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 GeV2 at the level of about 10 -2 mb · GeV-210-1 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 GeV2, 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 disk 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.

Original languageEnglish (US)
Pages (from-to)2551-2599
Number of pages49
JournalInternational Journal of Modern Physics A
Volume24
Issue number14
DOIs
StatePublished - Jun 10 2009

Fingerprint

elastic scattering
cones
physics
cross sections
forward scattering
shrinkage
scattering amplitude
pions
fine structure
luminosity
slopes
intervals
saturation
oscillations
thresholds
scattering
diffraction
energy

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics

Cite this

Fiore, R., Jenkovszky, L., Orava, R., Predazzi, E., Prokudin, A., & Selyugin, O. (2009). Forward physics at the LHC; Elastic scattering. International Journal of Modern Physics A, 24(14), 2551-2599. https://doi.org/10.1142/S0217751X09044255
Fiore, R. ; Jenkovszky, L. ; Orava, R. ; Predazzi, E. ; Prokudin, A. ; Selyugin, O. / Forward physics at the LHC; Elastic scattering. In: International Journal of Modern Physics A. 2009 ; Vol. 24, No. 14. pp. 2551-2599.
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Fiore, R, Jenkovszky, L, Orava, R, Predazzi, E, Prokudin, A & Selyugin, O 2009, 'Forward physics at the LHC; Elastic scattering', International Journal of Modern Physics A, vol. 24, no. 14, pp. 2551-2599. https://doi.org/10.1142/S0217751X09044255

Forward physics at the LHC; Elastic scattering. / Fiore, R.; Jenkovszky, L.; Orava, R.; Predazzi, E.; Prokudin, A.; Selyugin, O.

In: International Journal of Modern Physics A, Vol. 24, No. 14, 10.06.2009, p. 2551-2599.

Research output: Contribution to journalArticle

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