Abstract.
Experimental and theoretical studies of direct photon production in hadronic collisions essentially expand our insights in multiparticle production mechanisms. These photons are useful probes to investigate nuclear matter at all stages of the interaction. Soft photons play a particular role in these studies. Until now we have no explanation for the experimentally observed excess of soft photons. These photons have low transverse momenta \( p_{T} < 0.1\) GeV/c, \( \vert x\vert < 0.01\) . In this domain their yield exceeds the theoretical estimates by 5-8 times. The registration of soft photons at Nuclotron (LHEP, JINR) has been carried out by the electromagnetic calorimeter built by the SVD-2 Collaboration. Soft photon electromagnetic calorimeter was tested at U-70, IHEP (Protvino). For the first time the soft photon yield at interactions of 3.5A GeV/c per nucleon deuterium and lithium beams has been measured. The obtained energy spectra confirm the increased yield of soft photons with their energy less than 50MeV (in the laboratory system) in comparison with theoretical predictions and agree with previous experiments at high-energy interactions. It is planned to continue soft photon study at the future accelerator complex NICA with heavy-ion beams.
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References
J.F. Owens, Rev. Mod. Phys. 59, 465 (1997)
W. Vogelsang et al., J. Phys. G 23, A1 (1997)
WA98 Collaboration (M.M. Aggarwal), arXiv:nucl-ex/0006007
P.V. Chliapnikov et al., Phys. Lett. B 141, 276 (1984)
M.N. Ukhanov, IHEP preprint 86-195, Protvino, (1986)
S. Banerjee et al., Phys. Lett. B 305, 182 (1993)
A. Belogianni et al., Phys. Lett. B 408, 487 (1997)
F. Botterweck et al., Z. Phys. C 51, 541 (1991)
DELPHI Collaboration (J. Abdallah et al.), Eur. Phys. J. C 47, 273 (2006)
DELPHI Collaboration (J. Abdallah et al.), Eur. Phys. J. C 57, 499 (2008)
P. Lichard, L. Van Hove, Phys. Lett. B 245, 605 (1990)
E.V. Shuryak, Phys. Lett. B 231, 175 (1989)
M.K. Volkov et al., Phys. Lett. B 424, 235 (1998)
M.K. Volkov et al., Yad. Fiz. 62, 133 (1999)
S. Barshay, Phys. Lett. B 227, 279 (1989)
M.K. Volkov, E.S. Kokoulina, E.A. Kuraev, Ukr. J. Phys. 48, 1252 (2003)
E.S. Kokoulina, V.A. Nikitin, in Proceedings of International School-Seminar “The Actual Problems of Microworld Physics”, Gomel, Belarus 2003, Vol. 1 (2005) p. 221
E.S. Kokoulina, V.A. Nikitin, in Proceedings of the XVII International Baldin Seminar on High Energy Physics Problems: Relativistic Nuclear Physics and Quantum Chromodynamics: ISHEPP 2004, edited by A.N. Sissakian, V.V. Burov, A.I. Malakhov (JINR, Dubna, 2005) p. 319
P.F. Ermolov, in Proceedings of the XVII International Baldin Seminar on High Energy Physics Problems: Relativistic Nuclear Physics and Quantum Chromodynamics: ISHEPP 2004, edited by A.N. Sissakian, V.V. Burov, A.I. Malakhov (JINR, Dubna, 2005) p. 327
V.V. Avdeichikov, JINR-P1-2004-190 (2005)
E. Kokoulina, Acta Phys. Pol. B 35, 295 (2004)
E. Kokoulina, A. Kutov, Phys. At. Nucl. 71, 1543 (2008)
E.S. Kokoulina et al., Phys. At. Nucl. 72, 189 (2009)
SVD-2 Collaboration (E.N. Ardashev), IHEP Preprint 2011-4 (2011), http://web.ihep.su/library/pubs/all-w.htm arXiv:hep-ex/1104.0101
E.S. Kokoulina on behalf of the SVD-2 Collaboration, Progr. Theor. Phys. 193, 306 (2012)
V.N. Ryadovikov on behalf of the SVD-2 Collaboration, Phys. At. Nucl. 75, 989 (2012) arXiv:hep-ex/1104.3673
V.V. Begun, M.I. Gorenstein, Phys. Lett. B 53, 190 (2007)
V.A. Nikitin et al., Nonlinear Phenom. Complet Syst. 12, 202 (2010)
J. Cleymans, K. Redlich, Phys. Rev. C 60, 054908 (1999)
F. Becattini, J. Manninen, M. Gazdzicki, Phys. Rev. C 73, 044905 (2006)
SVD-2 Collaboration (E.N. Ardashev et al.), Instrum. Exp. Tech. 58, 18 (2015)
SVD-2 Collaboration (E. Kokoulina et al.), EPJ Web of Conferences 105, 10005 (2016) arXiv:1510.00517 [nucl-ex]
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Ardashev, E., Avdeichikov, V., Balandin, V. et al. From soft photon study at Nuclotron and U-70 to NICA. Eur. Phys. J. A 52, 261 (2016). https://doi.org/10.1140/epja/i2016-16261-4
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DOI: https://doi.org/10.1140/epja/i2016-16261-4