Θ+Search at HERMES with Deuterium and Hydrogen Targets
PROCEEDINGS OF THE 10TH INTERNATIONAL WORKSHOP ON THE PHYSICS OF EXCITED NUCLEONS (NSTAR2015)（2016）
Peking Univ | Univ Basque Country UPV EHU
Abstract
The previous search at HERMES for narrow baryon states excited in quasi- real photo-production, decaying through the channel Theta(+) -> pK(S)(0) -> p pi(+)pi(-), has been extended. Improved decay-particle reconstruction, more advanced particle identification, and increased event samples are employed. The structure that was observed earlier at an invariant mass of 1528 MeV shifts to 1522 MeV in the new analysis of data with a deuterium target, with a drop of statistical significance to about 2 sigma. The number of events above background is 68(-31)(+98)(stat) +/- 13(sys). No such structure is observed in the hydrogen data set.
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Key words
pentaquark,Theta(+),baryon production,glueball,nonstandard multi-quark state
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