Elsevier

Physics Letters B

Volume 216, Issues 3–4, 12 January 1989, Pages 459-465
Physics Letters B

Precise comparison of antiproton-proton and proton-proton forward elastic scattering at √s = 24.3 GeV

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Abstract

We report results from a measurement of antiproton-proton and proton-proton small-angle elastic scattering at √s = 24.3 GeV in the range 0.001 ⩽ |t | ⩽ 0.06 (GeV/c)2. The measurement was performed at the CERN pp Collider by using silicon detectors to observe protons recoiling from a hydrogen cluster-jet target intercepting the stored p and p beams. Fits to the measured differential cross sections yield the ratio of the real to the imaginary part of the forward nuclear scattering amplitude ρ and the nuclear slope parameter b for both pp and pp. We find that the difference Δρ = ρ (pp) − ρ(pp) = 0.031 ± 0.010 agrees with conventional fits and disagrees with the “odderon” fit designed to accommodate the recent UA4 measurement of ρ(pp) at 546 GeV.

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1

Present address: Yale University, New Haven, CT, USA.

2

Present address: University of Michigan, Ann Arbor, MI, USA.

3

Present address: Univesità di Milano, I-20133, Milan, Italy.

4

Present address: Ascom Autophon, Bellinzona, Switzerland.

5

Present address: Administration Fédérale Suisse, CH-1211 Geneva, Switzerland.

6

Permanent address: Fermilab, Batavia, IL 60510, USA.

7

Present address: Publicitas, CH-1006 Lausanne, Switzerland.

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