TY  - JOUR
A1  - Ewerz, Carlo
A1  - Lebiedowicz, Piotr
A1  - Nachtmann, Otto
A1  - Szczurek, Antoni
T1  - Helicity in proton–proton elastic scattering and the spin structure of the pomeron
T2  - Physics Letters B
N2  - We discuss different models for the spin structure of the nonperturbative pomeron: scalar, vector, and rank-2 symmetric tensor. The ratio of single-helicity-flip to helicity-conserving amplitudes in polarised high-energy proton–proton elastic scattering, known as the complex r5 parameter, is calculated for these models. We compare our results to experimental data from the STAR experiment. We show that the spin-0 (scalar) pomeron model is clearly excluded by the data, while the vector pomeron is inconsistent with the rules of quantum field theory. The tensor pomeron is found to be perfectly consistent with the STAR data.
Y1  - 2016
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/54674
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-546746
SN  - 1873-2445
SN  - 0370-2693
VL  - 763.2016
SP  - 382
EP  - 387
PB  - Elsevier
CY  - Amsterdam
ER  -