Total Cross Sections of Protons, Antiprotons, andπandKMesons on Hydrogen and Deuterium in the Momentum Range 6-22GeVc

Abstract

The total cross sections <TT of p, p, w ± , and K* on hydrogen and deuterium have been measured between 6 and 22 GeV/c at intervals of 2 GeV/c to an accuracy greater than previously reported. The method utilized was a conventional good-geometry transmission experiment with scintillation counters subtending various solid angles at targets of liquid H2 and D2. With the increase in statistical accuracy of the data, it was found that a previously adopted procedure of linearly extrapolating to zero solid angle the partial cross sections measured at finite solid angles was not a sufficiently accurate procedure from which to deduce or. The particle-neutron cross sections are derived by applying the Glauber screening correction to the difference between the particle-deuteron and particle-proton cross sections. The cross sections orOr+d) and <XT{Tr~d) are equal at all measured momenta, which confirms the validity of charge symmetry up to 20 GeV/c. Results are presented showing the variation of cross sections with momentum; evidence is presented for a small but significant decrease in <TT(PP) [and aT(pn)'] in the momentum region above 12 GeV/c.

Introduction to the physics of the total cross section at LHC

“…The situation changed with the first measurements at particle accelerators, which took place at fixed target machines; see for instance [98]. These measurements were followed in the 1960s by extensive ones, again at fixed target machines, at the CERN ProtoSynchrotron [99], at Brookhaven National Laboratory [100] and in Serpukhov [101]. These earlier measurements showed decreasing total cross sections, more so in the case ofp p, only slightly in the case of proton-proton.…”

Measurement of the SemileptonicCPAsymmetry inB0-B¯

“…The systematic effect from any residual tracking asymmetry is estimated by using J=ψ → μ þ μ − decays [18]. The uncertainty from a possible pion nuclear-interaction charge asymmetry is estimated to be 0.035%, by using a parameterization [11] of the measured cross sections of pions on deuterium [19] and the LHCb detector simulation. μ X n decays, where X n represents any neutral baryonic state, is estimated to be roughly 2% by using the ratio of Λ 0 b to B 0 production cross sections [20], simulated efficiencies, and the branching ratio of [21].…”

High-Energy Hadron--Deuteron Scattering.

“…(EliG>ff et al , 1962;Galbraith et al, 1965;Chamberlain et al , 1957) and showing an appreciable double scattering effect (see Fig. 1~4).…”

“…Using as input the measured experimental data (Elioff et al, 1962;' Galbraith et al, 1965;Czyzewski et al, 1965;Coombes et al, 1958;Armenteros et al, 1960;Foley et al, 1963;Ferbel et al, 1965) on ..…”