Test of Universal Rise of Hadronic Total Cross Sections based on pi p, Kp and pbar p,pp Scatterings

TL;DR

This study investigates whether the coefficient B in the high-energy rise of hadronic total cross sections is universal across different scattering processes, using experimental data and duality constraints, and finds consistent values supporting universality.

Contribution

It provides the first individual estimates of B, s0, and Z for various hadronic scatterings without assuming universality, supported by duality constraints and experimental fits.

Findings

Values of B are consistent within one standard deviation across processes.

The ratio of Z parameters aligns with quark model predictions.

Predicted total cross section at LHC energy is approximately 108 mb.

Abstract

Recently there are several evidences of the hadronic total cross section sigma(tot) to be proportional to B (log s)2 consistent with the Froissart unitarity bound. The COMPETE collaborations have further assumed sigma(tot) = B (log s/s0)2 + Z to extend its universal rise with the common value of B and s0 for all hadronic scatterings to reduce the number of adjustable parameters. The coefficient B was suggested to be universal in the arguments of colour glass condensate (CGC) of QCD in recent years. There has been, however, no rigorous proof yet based only on QCD. We attempt to investigate the value of B for pi+- p, K+- p and pbar p,pp scatterings respectively through the search for the simultaneous best fit to the experimental sigma(tot) and rho ratios at high energies. The sigma(tot) at the resonance and intermediate energy regions has also been exploited as a duality constraint based on the special form of finite-energy sum rule(FESR). We estimate the values of B, s0 and Z individually for pi+- p, K+- p and pbar p,pp scatterings without using the universality hypothesis. It turs out that the values of B are mutually consistent within one standard deviation. It has to be stressed that we cannot obtain such a definite conclusion without the duality constraint. It is also interesting to note that the values of Z for pi p, Kp and pbar(p)p approximately satisfy the ratio 2:2:3 predicted by the quark model. The obtained value of B for pbar(p)p is Bpp = 0.280 +- 0.015 mb, which predicts sigma(tot)(pp) =108.0 +- 1.9mb and rho(pp) =0.131+- 0.0025 at the LHC energy s^0.5 =14 TeV.