π±p,K±p,

Abstract

The differentlal cross sectlons for the elastlc scattering of ?r+, 9-, K + , K -, p, and on protons have been measured In the t interval -0.04 to -0 75 G~V~ at five momenta: 50, 70, 100, 140, and 175 GeV/c. The t distributions have been parametrized by the quadratic exponential form d o / d t = A exp(Bl tl + ~i t l ' ) and the energy dependence has been described in terms of a slngle-pole Regge model. The pp and K + p dlffractlon peaks are found to shrink with a' -0 20 and -0.15 G~v-', respectively. The jip diffraction peak 1s antishrinklng while ?r t p and K -p are relatively energy-independent. Total elastic cross sections are calculated by mtegrating the differential cross sections. The rapld decline In o,, observed at low energles has stopped and all six reactions approach relatively constant values of o,,. The ratlo of o,,/o,,, approaches a constant value for all six reactions by 100 GeV, consistent with the predictions of the geometric-scaling hypothesis. This ratlo is -0.18 for p p and jip, and -0.12-0.14 for r ' p and K t p . A crossover 1s observed between K f p and K -p scattering at Itl-0.19 GeV2, and between pp and jip at It/-0.11 GeV2. Inversion of the cross sections into impact-parameter space shows that protons are quite transparent to mesons even in head-on collisions. The probability for a meson to pass t h r~u g h a proton head-on wlthout Interaction inelastlcally 1s -20% whlle it is only -6% for an Incident proton or antiproton Finally, the results are compared with various quarkmodel predictions D . S . A Y B E S r t a 1Extracted Proton Septa f-Stops Main Bends Momentum Stop FIG. 1. Diagram of the first stage of the iM6E beam showing the horizontal plane-optics configuration. The momentum and f stops are variable collimators.

Diffractive excitation in pp and pA collisions at high energies

“…[2,4,8,10]. All selected data for pp [2,4,8,10,[53][54][55][56][57][58][59][60][61][62][63][64] andpp [56,60,[65][66][67][68][69] scattering are displayed in Tables I and II, respectively, together with our results for G 2 and β. The errors in the experimental data corresponds to statistical and systematic uncertainties added in quadrature and the errors in the parameters of the model were obtained from error propagation from the data uncertainties.…”

“…43.86 ± 0.22 8.2 ± 0.4 2.56 ± 0.20 0.264 ± 0.016 11.54[56] 43.00 ± 0 22. 7.30 ± 0.47 2.21 ± 0.21 0.291 ± 0.022 13.76 [56] 42.04 ± 0.21 7.8 ± 0.6 2.53 ± 0.31 0.255 ± 0.024 16.26 [56] 41.80 ± 0.21 7.52 ± 0.6 2.41 ± 0.30 0.264 ± 0.026 18.17 [56] 41.60 ± 0.21 7.12 ± 0.52 2.23 ± 0.25 0.279 ± 0.024 30.4 [60] 42.13 ± 0.58 7.16 ± 0.44 2.21 ± 0.21 0.284 ± 0.023 52.6 [60] 43.32 ± 0.34 7.44 ± 0.44 2.25 ± 0.20 0.289 ± 0.021 62.3 [60] 44.12 ± 0.40 7.46 ± 0.44 2.19 ± 0.19 0.300 ± 0.022 546 [65, 66] 61.26 ± 0.93 12.87 ± 0.30 3.11 ± 0.15 0.319 ± 0.015 547 [67] 61.90 ± 1.6 13.30 ± 0.61 3.23 ± 0.31 0.313 ± 0.027 1800 [68] 71.71 ± 2.02 15.79 ± 0.87 3.38 ± 0.38 0.351 ± 0.034 1800 [65, 66] 80.03 ± 2.24 19.70 ± 0.85 4.20 ± 0.45 0.337 ± 0.030 1800 [69] 72.10 ± 3.3 16.6 ± 1.6 3.67 ± 0.75 0.333 ± 0.056 TABLE II: Experimental data on σtot and σ el frompp scattering considered in this analysis and the values of the parameters G 2 and β of Miettinen-Pumplin model determined with Eqs.…”

Is there a hadron spin-flip contribution to the Coulomb-hadron interference at small momentum transfer and high energies?

“…3. The non-normalized experimental data [31] were normalized to the experimental data [30] at p L = 50 GeV/c and [32] at p L = 100 GeV/c. It is clear that the coincidence of the theoretical curves and exper-imental data was obtained sufficiently good for both the energies and the whole examined region of the momentum transfer.…”

Elastic scattering of hadrons

“…The diffraction cone behavior changed at larger transferred momenta |t| to a slower t-dependence. Somewhat later, the energy range was extended to 50 GeV [10,11,12]. With the advent of new accelerators, the data for pp scattering at energies √ s ≈ 19,20,23,28,31,45,53,62 GeV were published [13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28] and the data for pp at 31,53,62,546,630,1800,1980 GeV [29,30,31,32,33,34,35,36,37,38] appeared.…”