Local nuclear slope and curvature in high energy $pp$ and $\bar pp$
elastic scattering

Authors:
P.
Desgrolard
,
J.
Kontros
,
A.I
Lengyel
,
E.S.Martynov
Comments:
PlainTeX, 24 pages, 5 ps-figures included, to be
published in Il Nuovo Cimento
Report-no:
LYCEN 9721
Journal-ref:
Nuovo Cim. A110 (1997) 615-630

The local nuclear slope $B(s,t) = {d \over d t} (\ln
{d\sigma_n (s,t)\over dt})$ is reconstructed from the experimental
angular distributions with a procedure that uses overlapping $t$-bins,
for an energy that ranges from the ISR to the $S\bar ppS$ and the
Tevatron. Predictions of several models of ($p,p$) and ($\bar p,p$)
elastic scattering at high energy are tested in $B(s,t)$ at small
$|t|$. Only a model with two-components Pomeron and Odderon gives a
satisfactory agreement with the (non fitted) slope data, in particular
for the evolution of $B(s,t)$ with $s$ as a function of $t$ in $\bar
pp$ scattering. This model predicts a similar behavior for $pp$ and
$\bar pp$ scattering at small $|t|$. A detailed confirmation for $pp$
collisions would be expected from RHIC.

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