Pentaquark Θ+ search at HERMES

N. Akopov, Z. Akopov, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetisyan, S. Belostotski, H. P. Blok, A. Borissov, J. Bowles, V. Bryzgalov, J. Burns, G. P. Capitani, E. Cisbani, G. Ciullo, M. Contalbrigo, P. F. Dalpiaz, W. Deconinck, R. De Leo, E. De SanctisP. Di Nezza, G. Elbakian, E. Etzelmüller, R. Fabbri, A. Fantoni, L. Felawka, S. Frullani, D. Gabbert, J. Garay García, F. Garibaldi, G. Gavrilov, F. Giordano, S. Gliske, M. Hartig, D. Hasch, Y. Holler, I. Hristova, Y. Imazu, A. Ivanilov, H. E. Jackson, S. Joosten, R. Kaiser, G. Karyan, T. Keri, E. Kinney, A. Kisselev, V. Kozlov, P. Kravchenko, V. G. Krivokhijine, L. Lagamba, L. Lapikás, I. Lehmann, A. López Ruiz, W. Lorenzon, X. Lu, B. Q. Ma, D. Mahon, S. I. Manaenkov, Y. Mao, B. Marianski, A. Martinez De La Ossa, H. Marukyan, C. A. Miller, Y. Miyachi, A. Movsisyan, M. Murray, E. Nappi, A. Nass, M. Negodaev, W. D. Nowak, L. L. Pappalardo, R. Perez-Benito, A. Petrosyan, P. E. Reimer, A. R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, J. Rubin, D. Ryckbosch, Y. Salomatin, G. Schnell, K. P. Schüler, B. Seitz, T. A. Shibata, M. Stancari, J. J.M. Steijger, S. Taroian, A. Terkulov, R. Truty, A. Trzcinski, M. Tytgat, Y. Van Haarlem, C. Van Hulse, D. Veretennikov, V. Vikhrov, I. Vilardi, S. Wang, S. Yaschenko, H. Ye, Z. Ye, S. Yen, B. Zihlmann, P. Zupranski

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

The earlier search at HERMES for narrow baryon states excited in quasireal photoproduction, decaying through the channel pKS0→pπ+π-, has been extended with improved decay-particle reconstruction, more advanced particle identification, and increased event samples. The structure observed earlier at an invariant mass of 1528 MeV shifts to 1522 MeV and the statistical significance drops to about 2σ for data taken with a deuterium target. The number of events above background is 68-31+98(stat)±13(sys). No such structure is observed in the hydrogen data set.

Original languageEnglish (US)
Article number057101
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume91
Issue number5
DOIs
StatePublished - Mar 31 2015

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Pentaquark Θ+ search at HERMES'. Together they form a unique fingerprint.

  • Cite this

    Akopov, N., Akopov, Z., Augustyniak, W., Avakian, R., Avetissian, A., Avetisyan, E., Belostotski, S., Blok, H. P., Borissov, A., Bowles, J., Bryzgalov, V., Burns, J., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., ... Zupranski, P. (2015). Pentaquark Θ+ search at HERMES. Physical Review D - Particles, Fields, Gravitation and Cosmology, 91(5), [057101]. https://doi.org/10.1103/PhysRevD.91.057101