Soft Pomerons and the Forward LHC Data
Autor: | Márcio José Menon, M. Broilo, E. G. S. Luna |
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Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
Physics
Nuclear and High Energy Physics Propagation of uncertainty Angular momentum Particle physics Large Hadron Collider 010308 nuclear & particles physics Plane (geometry) Scattering FOS: Physical sciences 01 natural sciences lcsh:QC1-999 High Energy Physics - Experiment Pomeron High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology Amplitude High Energy Physics - Phenomenology (hep-ph) Dispersion relation 0103 physical sciences 010306 general physics lcsh:Physics |
Zdroj: | Physics Letters B, Vol 781, Iss, Pp 616-620 (2018) Physics Letters |
Popis: | Recent data from LHC13 by the TOTEM Collaboration on $\sigma_{tot}$ and $\rho$ have indicated disagreement with all the Pomeron model predictions by the COMPETE Collaboration (2002). On the other hand, as recently demonstrated by Martynov and Nicolescu (MN), the new $\sigma_{tot}$ datum and the unexpected decrease in the $\rho$ value are well described by the maximal Odderon dominance at the highest energies. Here, we discuss the applicability of Pomeron dominance through fits to the \textit{most complete set} of forward data from $pp$ and $\bar{p}p$ scattering. We consider an analytic parametrization for $\sigma_{tot}(s)$ consisting of non-degenerated Regge trajectories for even and odd amplitudes (as in the MN analysis) and two Pomeron components associated with double and triple poles in the complex angular momentum plane. The $\rho$ parameter is analytically determined by means of dispersion relations. We carry out fits to $pp$ and $\bar{p}p$ data on $\sigma_{tot}$ and $\rho$ in the interval 5 GeV - 13 TeV (as in the MN analysis). Two novel aspects of our analysis are: (1) the dataset comprises all the accelerator data below 7 TeV and we consider \textit{three independent ensembles} by adding: either only the TOTEM data (as in the MN analysis), or only the ATLAS data, or both sets; (2) in the data reductions to each ensemble, uncertainty regions are evaluated through error propagation from the fit parameters, with 90 \% CL. We argument that, within the uncertainties, this analytic model corresponding to soft Pomeron dominance, does not seem to be excluded by the \textit{complete} set of experimental data presently available. Comment: 10 pages, 4 figures, 1 table. Two paragraphs and four references added. Accepted for publication in Phys. Lett. B |
Databáze: | OpenAIRE |
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