Studies of the high momentum transfer
hard quasi-exclusive pp interactions
with EVA detector
Open Access
Author:
Zhalov, Daniel
Graduate Program:
Physics
Degree:
Doctor of Philosophy
Document Type:
Dissertation
Date of Defense:
October 10, 2001
Committee Members:
Steven Heppelmann, Committee Chair/Co-Chair Pablo Laguna, Committee Member Richard Wallace Robinett, Committee Member Mark Strikman, Committee Chair/Co-Chair
Keywords:
proton pion production gluon bremstrahlung
Abstract:
We report the new effects observed in $pp
ightarrow ppX$
reaction. The data was collected using the EVA apparatus. EVA is
a part of the E850 experiment, located at the AGS (Alternating Gradient Synchrotron)
in Brookhaven National Laboratory.
We study the inclusive $pp
ightarrow ppX$ processes using the
kinematic variable $X_{L}$. This variable is called the fraction of the incident
longitudinal momentum observed in the 'two-track' final state.
We discuss an interesting effect of the shift in the $X_{L}$
distribution for the nuclear target when compared to the $X_{L}$
distribution for the Hydrogen target.
The unexpected dependences in the distributions of the missing transverse momentum
are observed in the more constrained set of data, which consists of
$pp
ightarrow pppi^{0}$ processes. The $P_{T}^{2}$ distribution for the events
in this set is flat in the wide range of values. The expected behavior of this
distribution is an exponential fall off. We also observe a puzzling asymmetry for
the components of the missing momentum. We propose a possible explanation of
these effects.
