Abstract.
Precise data for quasi-free photoproduction of η-mesons off the deuteron have been measured at the Bonn ELSA accelerator with the combined Crystal Barrel/TAPS detector for incident photon energies up to 2.5GeV. The η-mesons have been detected in coincidence with recoil protons and neutrons. Possible nuclear effects like Fermi motion and re-scattering can be studied via a comparison of the quasi-free reaction off the bound proton to η-production off the free proton. No significant effects beyond the folding of the free cross-section with the momentum distribution of the bound protons have been found. These Fermi motion effects can be removed by an analysis using the invariant mass of the η-nucleon pairs reconstructed from the final-state four-momenta of the particles. The total cross-section for quasi-free η-photoproduction off the neutron reveals even without correction for Fermi motion a pronounced bump-like structure around 1GeV of incident photon energy, which is not observed for the proton. This structure is even narrower in the invariant-mass spectrum of the η-neutron pairs. Position and width of the peak in the invariant-mass spectrum are W ≈ 1665 MeV and FWHM Γ ≈ 25 MeV. The data are compared to the results of different models.
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References
S. Dürr et al., Science 322, 1224 (2008)
J. Bulava et al., Phys. Rev. D 82, 014507 (2010)
T. Burch et al., Phys. Rev. D 74, 014504 (2006)
S. Basak et al., Phys. Rev. D 76, 074504 (2007)
S. Capstick, W. Roberts, Prog. Part. Nucl. Phys. 241, 241 (2000)
E. Klempt, J.M. Richard, Rev. Mod. Phys. 82, 1095 (2010)
M. Anselmino et al., Rev. Mod. Phys. 65, 1199 (1993)
R. Bijker, F. Iachello, A. Leviatan, Ann. Phys. (N.Y.) 236, 69 (1994)
N. Isgur, J. Paton, Phys. Rev. D 31, 2910 (1985)
E.E. Kolomeitsev, M.F.M. Lutz, Phys. Lett. B 585, 243 (2004)
V.D. Burkert, T.-S. Lee, Int. J. Mod. Phys. E 13, 1035 (2004)
B. Krusche, S. Schadmand, Prog. Part. Nucl. Phys. 51, 399 (2003)
R.G. Moorehouse, Phys. Rev. Lett. 16, 772 (1966)
I. Jaegle et al., Phys. Rev. Lett. 100, 252002 (2008)
I. Jaegle et al., Eur. Phys. J. A 47, 11 (2011)
B. Krusche et al., Phys. Rev. Lett. 74, 3736 (1995)
J. Ajaka et al., Phys. Rev. Lett. 81, 1797 (1998)
A. Bock et al., Phys. Rev. Lett. 81, 534 (1998)
C.S. Armstrong et al., Phys. Rev. D 60, 052004 (1999)
R. Thompson et al., Phys. Rev. Lett. 86, 1702 (2001)
F. Renard et al., Phys. Lett. B 528, 215 (2002)
M. Dugger et al., Phys. Rev. Lett. 89, 222002 (2002)
V. Crede et al., Phys. Rev. Lett. 94, 012004 (2005)
T. Nakabayashi et al., Phys. Rev. C 74, 035202 (2006)
O. Bartalini et al., Eur. Phys. J. A 33, 169 (2007)
O. Bartholomy et al., Eur. Phys. J. A 33, 133 (2007)
D. Elsner et al., Eur. Phys. J. A 33, 147 (2007)
H. Denizli et al., Phys. Rev. C 76, 015204 (2007)
V. Crede et al., Phys. Rev. C 80, 055202 (2009)
M. Williams et al., Phys. Rev. C 80, 045213 (2009)
M. Sumihama et al., Phys. Rev. C 80, 052201(R) (2009)
E.F. McNicoll et al., Phys. Rev. C 82, 035208 (2010)
B. Krusche et al., Phys. Lett. B 397, 171 (1997)
A. Fantini et al., Phys. Rev. C 78, 015203 (2008)
W.-T. Chiang et al., Nucl. Phys. A 700, 429 (2002)
K. Nakamura et al., J. Phys. G 37, 075021 (2010)
V.A. Anisovich et al., Eur. Phys. J. A 25, 427 (2005)
B. Krusche et al., Phys. Lett. B 358, 40 (1995)
P. Hoffmann-Rothe et al., Phys. Rev. Lett. 78, 4697 (1997)
V. Hejny et al., Eur. Phys. J. A 6, 83 (1999)
J. Weiss et al., Eur. Phys. J. A 16, 275 (2003)
J. Weiss et al., Eur. Phys. J. A 11, 371 (2001)
M. Pfeiffer et al., Phys. Rev. Lett. 92, 252001 (2004)
N. Kaiser, P.B. Siegel, W. Weise, Phys. Lett. B 362, 23 (1995)
N. Kaiser, T. Waas, W. Weise, Nucl. Phys. A 612, 297 (1997)
M. Polyakov, A. Rathke, Eur. Phys. J. A 18, 691 (2003)
R.A. Arndt et al., Phys. Rev. C 69, 035208 (2004)
H.-C. Kim et al., Phys. Rev. D 71, 094023 (2005)
V. Kuznetsov et al., Phys. Lett. B 647, 23 (2007)
F. Miyahara et al., Prog. Theor. Phys. Suppl. 168, 90 (2007)
V. Shklyar, H. Lenske, U. Mosel, Phys. Lett. B 650, 172 (2007)
R. Shyam, O. Scholten, Phys. Rev. C 78, 065201 (2008)
M. Döring, K. Nakayama, Phys. Lett. B 683, 145 (2010)
A. Fix, L. Tiator, M.V. Polyakov, Eur. Phys. J. A 32, 311 (2007)
V.A. Anisovich et al., Eur. Phys. J. A 41, 13 (2009)
V. Kuznetsov et al., Phys. Rev. C 83, 022201(R) (2011)
D. Husman, W.J. Schwille, Phys. Bl. 44, 40 (1988)
W. Hillert, Eur. Phys. J. A 28, 139 (2006)
D. Elsner et al., Eur. Phys. J. A 39, 373 (2009)
E. Aker et al., Nucl. Instrum. Methods A 321, 69 (1992)
R. Novotny, IEEE Trans. Nucl. Sci. 38, 379 (1991)
A.R. Gabler et al., Nucl. Instrum. Methods A 346, 168 (1994)
G. Suft et al., Nucl. Instrum. Methods A 538, 416 (2005)
H. van Pee et al., Eur. Phys. J. A 31, 61 (2007)
I. Jaegle, PhD thesis, University of Basel (2007) (http://jazz.physik.unibas.ch/site/theses.html)
R. Brun, GEANT, Cern/DD/ee/84-1 (1986)
T. Mertens et al., Eur. Phys. J. A 38, 195 (2008)
C. Zeitnitz, The GEANT-CALOR interface user’s guide (2001). (http://www.staff.uni-mainz.de/zeitnitz/Gcalor/gcalor.html)
E. Schäfer, PhD thesis, University of Mainz, unpublished (1993)
M. Lacombe et al., Phys. Lett. B 101, 139 (1981)
D. Elsner, Int. J. Mod. Phys. E 19, 869 (2010)
W.T. Chiang et al., Phys. Rev. C 68, 045202 (2003)
K.H. Althoff et al., Z. Phys. C 1, 327 (1979)
A.M. Bernstein et al., Phys. Rev. C 55, 1509 (1997)
A.B. Gridnev, N.G. Kozlenko, Eur. Phys. J. A 4, 187 (1999)
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The CBELSA/TAPS Collaboration., Jaegle, I., Krusche, B. et al. Quasi-free photoproduction of η-mesons off the deuteron. Eur. Phys. J. A 47, 89 (2011). https://doi.org/10.1140/epja/i2011-11089-0
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DOI: https://doi.org/10.1140/epja/i2011-11089-0