Abstract
We analyse the recently discovered phenomena in elastic protonproton scattering at the LHC: the low-|t| “break” (departure from the exponential behaviour of the diffraction cone), the accelerating rise with energy of the forward slope B(s), the absence of secondary dips and bumps on the cone and the role of the odderon in the forward phase of the amplitude, ρ(13 TeV) = 0:09 ± 0:01, especially its contribution at the dip region, measured recently by TOTEM. The dip at 13 TeV seems to become more shallow with respect to lower energies, and we attribute this important new phenomena to the odderon contribution. These findings call for a revision of the standeard Regge-pole theory.
Highlights
During the past seven years the TOTEM Collaboration produced a number of spectacular results o√n proton-proton elastic and total cross sections measured at the LHC in the range 2.76 ≤ s ≤ 13 TeV [1]
Σtot, integrated elastic, σel and inelastic, σin cross sections, in general follow the expectations and extrapolations from lower energies, several new, unexpected features were discovered in elastic scattering. These are: 1. low-|t| structure in dσ/dt [2, 3]; 2. absence of secondary dips/bumps in dσ/dt [3, 4]; 3. further dynamics of the dip; first results at 13 TeV, reported by TOTEM; 4. unexpected rapid rise of the forward slope B(s, 0)) [1]; 5. surprisingly low value of the phase of the forward amplitude [3]. We analyze these phenomena within a Regge pole model and show that they call for a revision of the standard model based on a simple Regge pole lying on a linear trajectory with subsequent eikonalization
In the present paper we analyze elastic proton-proton scattering with special emphasis on the above issues, discovered by TOTEM, partly confirmed by ATLAS [5, 6]
Summary
During the past seven years the TOTEM Collaboration produced a number of spectacular results o√n proton-proton elastic and total cross sections measured at the LHC in the range 2.76 ≤ s ≤ 13 TeV [1]. Surprisingly low value of the phase of the forward amplitude [3]. We analyze these phenomena within a Regge pole model and show that they call for a revision of the standard model based on a simple Regge pole (pomeron) lying on a linear trajectory with subsequent eikonalization. In the present paper we analyze elastic proton-proton scattering with special emphasis on the above issues, discovered by TOTEM, partly confirmed by ATLAS [5, 6]
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