Abstract.
Photoproduction of η -mesons was studied with the Crystal-Barrel detector at ELSA for photon energies in the range from 0.75 to 3GeV. Total and differential cross-sections are presented. The η mesons are detected in two decay modes, in η → 2γ and in η → 3π0 → 6γ . The cross-sections vary slowly as functions of energy and η production angle suggesting that only few resonances make significant contributions to the cross-section. For photon energies above 1.5GeV, the differential cross-sections show a strong forward peak due to meson exchanges in the t channel. A comparison of the η -photoproduction cross-sections with SAID and MAID as well as with a partial-wave analysis performed on our data in combination with other data sets shows good agreement. The Bonn-Gatchina partial-wave analysis suggests that the largest contribution to η photoproduction for energies below 3GeV proceeds via three resonances, the well-known N(1535)S 11 , via N(1720)P 13 , and a newly suggested N(2070)D 15 .
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
N. Isgur, G. Karl, Phys. Lett. B 72, 109 (1977).
A.J.G. Hey, Nucl. Phys. B 95, 516 (1975).
L.Y. Glozman, D.O. Riska, Phys. Lett. B 366, 305 (1996).
N. Kaiser, Phys. Lett. B 362, 23 (1995).
G. Höhler, PiN Newslett. 14, 168 (1998).
S. Capstick, N. Isgur, Phys. Rev. D 34, 2809 (1986)
L.Y. Glozman, Phys. Rev. D 58, 094030 (1998).
U. Löring, Eur. Phys. J. A 10, 309 (2001)
O. Bartholomy, Phys. Rev. Lett. 94, 012003 (2005).
V. Crede, Phys. Rev. Lett. 94, 012004 (2005).
H. van Pee, Eur. Phys. J. A 31, 61 (2007).
R.A. Arndt, http://gwdac.phys.gwu.edu.
R. Prepost, Phys. Rev. Lett. 18, 82 (1967).
C. Bacci, Phys. Rev. Lett. 11, 37 (1963)
R. Erbe, Phys. Rev. 175, 1669 (1968).
S. Homma, J. Phys. Soc. Jpn. 57, 828 (1988).
E.D. Bloom, Phys. Rev. Lett. 21, 1100 (1968).
C.A. Heusch, Phys. Rev. Lett. 25, 1381 (1970).
J.W. Price, Phys. Rev. C 51, R2283 (1995).
A. Bock, Phys. Rev. Lett. 81, 534 (1998).
L. Sözüer, available at http://gwdac.phys.gwu.edu.
S.A. Dytman, Phys. Rev. C 51, 2710 (1995).
B. Krusche, Phys. Rev. Lett. 74, 3736 (1995).
J. Ajaka, Phys. Rev. Lett. 81, 1797 (1998).
F. Renard, Phys. Lett. B 528, 215 (2002).
M. Dugger, Phys. Rev. Lett. 89, 222002 (2002) (89, 249904 (2002) (E)).
G.A. Vartapetyan, S.E. Piliposyan, Sov. J. Nucl. Phys. 32, 804 (1980).
P.S.L. Booth, Nucl. Phys. B 71, 211 (1974).
I. Strakovsky, private communication (2005).
W.T. Chiang, Nucl. Phys. A 700, 429 (2002).
G. Knöchlein, Z. Phys. A 352, 327 (1995).
G. Suft, Nucl. Instrum. Methods A 538, 416 (2005).
E. Aker, Nucl. Instrum. Methods A 321, 69 (1992).
W.M. Yao, J. Phys. G 33, 1 (2006).
C. Amsler, Z. Phys. C 58, 175 (1993).
B. Krusche, Phys. Lett. B 397, 171 (1997).
A. Anisovich, Eur. Phys. J. A 24, 111 (2005).
O. Bartalini, Eur. Phys. J. A 26, 399 (2005).
A.A. Belyaev, Nucl. Phys. B 213, 201 (1983)
K.H. Althoff, Z. Phys. C 18, 199 (1983)
O. Bartalini, Phys. Lett. B 544, 113 (2002).
K.H. Glander, Eur. Phys. J. A 19, 251 (2004).
R. Lawall, Eur. Phys. J. A 24, 275 (2005).
J.W.C. McNabb, Phys. Rev. C 69, 042201 (2004).
R. Bradford, Phys. Rev. C 73, 035202 (2006).
R.G.T. Zegers, Phys. Rev. Lett. 91, 092001 (2003).
A. Lleres, Eur. Phys. J. A 31, 79 (2007).
A.V. Anisovich, Eur. Phys. J. A 25, 427 (2005).
A.V. Sarantsev, Eur. Phys. J. A 25, 441 (2005).
I.G. Aznauryan, Phys. Rev. C 68, 065204 (2003).
D. Elsner, Measurement of the beam asymmetry in eta photoproduction off the proton, arXiv:nucl-ex/0702032.
R.A. Arndt, Phys. Rev. C 69, 035213 (2004).
M. Benmerrouche, Phys. Rev. D 51, 3237 (1995).
B. Krusche, S. Schadmand, Prog. Part. Nucl. Phys. 51, 399 (2003).
E.M. Leikin, PiN Newslett. 16, 423 (2002).
Author information
Authors and Affiliations
Consortia
Corresponding author
Additional information
R. Milner
Rights and permissions
About this article
Cite this article
The CB-ELSA Collaboration., Bartholomy, O., Bogendörfer, R. et al. Photoproduction of η -mesons off protons. Eur. Phys. J. A 33, 133–146 (2007). https://doi.org/10.1140/epja/i2007-10455-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1140/epja/i2007-10455-9