Measurement of proton-proton elastic scattering into the Coulomb region at $\text{P}_\text{beam}$ = 2.5, 2.8 and 3.2 GeV/c

H. Xu; Y. Zhou; U. Bechstedt; J. Böker; A. Gillitzer; F. Goldenbaum; D. Grzonka; Q. Hu; A. Khoukaz; F. Klehr; B. Lorentz; D. Prasuhn; J. Ritman; S. Schadmand; T. Sefzick; T. Stockmanns; I. I. Strakovsky; A. Täschner; C. Wilkin; R. L. Workman; P. Wüstner

doi:10.1016/j.physletb.2020.136022

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arXiv · 2009.14299

Measurement of proton-proton elastic scattering into the Coulomb region at $\text{P}_\text{beam}$ = 2.5, 2.8 and 3.2 GeV/c

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Abstract

The proton--proton elastic differential cross section at very small four momentum transfer squared has been measured at three different incident proton momenta in the range of 2.5 to 3.2 GeV/c by detecting the recoil proton at polar angles close to $90^\circ$. The measurement was performed at COSY with the KOALA detector covering the Coulomb-nuclear interference region. The total cross section $\sigma_\text{tot}$, which has been determined precisely, is consistent with previous measurements. The values of the slope parameter $B$ and the relative real amplitude ratio $\rho$ determined in this experiment alleviate the lack of data in the relevant energy region. This precise data on $\rho$ might be an important check for a new dispersion analysis.

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H. Xu, Y. Zhou, U. Bechstedt, J. Böker, A. Gillitzer, F. Goldenbaum, D. Grzonka, Q. Hu, A. Khoukaz, F. Klehr, B. Lorentz, D. Prasuhn, J. Ritman, S. Schadmand, T. Sefzick, T. Stockmanns, I. I. Strakovsky, A. Täschner, C. Wilkin, R. L. Workman, P. Wüstner. 2020-09-29. Measurement of proton-proton elastic scattering into the Coulomb region at $\text{P}_\text{beam}$ = 2.5, 2.8 and 3.2 GeV/c. https://doi.org/10.1016/j.physletb.2020.136022

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