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Photoproduction of pi0 pi0 and pi0 pi± pairs off the proton from threshold to the second resonance region


Zehr, F.; Krusche, B.; Aguar, P.; Ahrens, Annand, J. R. M.; Arends, H. J.; Beck, R.; Bekrenev, V.; Boillat, B.; Braghieri, A.; Branford, D. et al.
Photoproduction of pi0 pi0 and pi0 pi± pairs off the proton from threshold to the second resonance region // European physical journal A : hadrons and nuclei, 48 (2012), 7; 98-1 doi:10.1140/epja/i2012-12098-1 (međunarodna recenzija, članak, znanstveni)


Naslov
Photoproduction of pi0 pi0 and pi0 pi± pairs off the proton from threshold to the second resonance region

Autori
Zehr, F. ; Krusche, B. ; Aguar, P. ; Ahrens, Annand, J. R. M. ; Arends, H. J. ; Beck, R. ; Bekrenev, V. ; Boillat, B. ; Braghieri, A. ; Branford, D. ; Briscoe, W.J. ; Brudvik, J. ; Cherepnya, S. ; Codling, R. F. B. ; Downie, E. J. ; Drexler, P. ; Glazier, D. I. ; Fil'kov, L. V. ; Gregor, R. ; Heid, E. ; Hornidge, D. ; Jaegle, I. ; Jahn, O. ; Kashevarov, V. L. ; Knežević, Andrea ; Kondratiev, R. ; Korolija, Milorad ; Kotulla, M. ; Krambrich, D. ; Kulbardis, A. ; Lang, M. ; Lisin, V. ; Livingston, K. ; Lugert, S. ; MacGregor, I. J. D. ; Manley, D. M. ; Maghrbi, Y. ; Martinez, M. ; McGeorge, J. C. ; Mekterović, Darko ; Metag, V. ; Nefkens, B. M. K. ; Nikolaev, A. ; Ostrick, M. ; Pedroni, P. ; Pheron, F. ; Polonski, A. ; Prakhov, S. ; Price, J. W. ; Rosner, G. ; Rost, M. ; Rostomyan, T. ; Schumann, S. ; Sober, D. ; Starostin, A. ; Supek, Ivan ; Tarbert, C. M. ; Thomas, A. ; Unverzagt, M. ; Walcher, Th. ; Watts, D. P.

Izvornik
European physical journal A : hadrons and nuclei (1434-6001) 48 (2012), 7; 98-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Pi photoproduction; channel cross section; mass spectrum; polarized beam; Crystal Ball

Sažetak
Precise total cross-sections and invariant-mass distributions have been measured for photoproduction of pion pairs off the proton producing pi0 p0 and n?+?0 final states from the threshold region up to 800 MeV incident photon energy. Additionally, beam helicity asymmetries have been measured in the second resonance region (550 MeV - 820 MeV). The experiment was performed at the tagged photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4? solid-angle electromagnetic calorimeter. The results are much more precise than any previous measurements and confirm the chiral perturbation theory predictions for the threshold behavior of these reactions. In the second resonance region, the invariant-mass distributions of meson-meson and meson-nucleon pairs are in reasonable agreement with model predictions, but none of the models reproduce the asymmetries for the mixed-charge channel.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
E-Print: arXiv:1207.2361 [nucl-ex]



POVEZANOST RADA


Projekt / tema
098-0982887-2888 - Hadronska fizika i QCD (Ivan Supek, )

Ustanove
Institut "Ruđer Bošković", Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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