Search for Pentaquarks with HERA-B
Joachim Spengler (Max-Planck-Institut fuer Kernphysik, Heidelberg,, Germany)
TL;DR
This study conducted a search for pentaquark particles Theta+ and Xi(1862) in proton-nucleus collisions at 41.6 GeV, finding no evidence of their existence and setting upper limits on their production rates.
Contribution
The paper provides the first extensive search for Theta+ and Xi(1862) pentaquarks in proton-nucleus collisions at this energy, establishing upper limits on their production cross sections.
Findings
No narrow signals observed for Theta+ and Xi(1862) pentaquarks.
Upper limits set on production cross sections and ratios.
Data constrains theoretical models predicting pentaquark production.
Abstract
A large data set of proton-nucleus collisions at sqrt(s) =41.6 GeV has been searched for Theta+ and Xi(1862) pentaquark candidates. In 2x10**8 inelastic events we find no evidence for narrow signals (sigma=5 MeV/c**2) in the Theta+ --> pK0s and Xi--(1862) --> Xi- pi- channels. Upper limits on production cross sections at mid-rapidity and on ratios of production cross sections to those of well established resonances are presented.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research · Particle physics theoretical and experimental studies