Abstract
In this paper we conduct a phenomenological study for the search of evidence for the intrinsic charm mechanism in double \({J \mathord{\left/ {\vphantom {J \psi }} \right. \kern-0em} \psi }\) production at the COMPASS experiment using the CERN \({{\pi }^{ - }}\) beam at 190 GeV/c. Estimations on \({J \mathord{\left/ {\vphantom {J \psi }} \right. \kern-0em} \psi }\) pair cross-sections and kinematic distributions are given for different production mechanisms. We also re-review the double \({J \mathord{\left/ {\vphantom {J \psi }} \right. \kern-0em} \psi }\) production data provided by the NA3 experiment using the CERN \({{\pi }^{ - }}\) beam at 150 and 280 GeV/c with incident on a platinum target.
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REFERENCES
S. J. Brodsky, P. Hoyer, C. Peterson, and N. Sakai, “The intrinsic charm of the proton,” Phys. Lett. B 93, 451 (1980).
S. J. Brodsky, J. C. Collins, S. D. Ellis, J. F. Gunion, and A. H. Mueller, “Intrinsic chevrolets at the SSC,” in Proceedings of the Snowmass Summer Study, June 23–July 13,1984, p. 0227.
M. Franz, M. V. Polyakov, and K. Goeke, “Heavy quark mass expansion and intrinsic charm in light hadrons,” Phys. Rev. D: Part. Fields 62, 074024 (2000).
W. S. Lockman, T. Meyer, J. Rander, P. Schlein, R. Webb, S. Erhan, and J. Zsembery, “Evidence for \(\Lambda _{c}^{ + }\) in inclusive \(pp \to ({{\Lambda }^{0}}{{\pi }^{ + }}{{\pi }^{ + }}{{\pi }^{ - }}\)) + X and \(pp \to ({{K}^{ - }}{{\pi }^{ + }}p)\)+ X at √s = 53 GeV and 62 GeV,” Phys. Lett. B 85, 443 (1979).
P. Chauvat et al. (R608 Collab.), “Production of Λ(c) with large X(f) at the ISR,” Phys. Lett. B 199, 304 (1987).
G. Bari et al. (R422 Collab.), “The Lambda/b0 beauty baryon production in proton proton interactions at √s = 62 GeV: A second observation,” Nuovo Cim. A 104, 1787 (1991).
S. J. Brodsky, V. A. Bednyakov, G. I. Lykasov, J. Smiesko, and S. Tokar, Prog. Part. Nucl. Phys. 93, 108 (2017).
M. Aaboud et al. (ATLAS Collab.), Phys. Lett. B 776, 295 (2018).
V. A. Bednyakov, S. J. Brodsky, A. V. Lipatov, G. I. Lykasov, M. A. Malyshev, J. Smiesko, and S. Tokar, Eur. Phys. J. C 79, 92 (2019).
M. Mattson et al. (SELEX Collab.), “First observation of the doubly charmed baryon \(\Xi _{{cc}}^{ + }\),” Phys. Rev. Lett. 89, 112001 (2002).
A. Ocherashvili et al. (SELEX Collab.), “Confirmation of the double charm baryon \(\Xi {{ + }_{{cc}}}(3520)\) via its decay to pD+K–,” Phys. Lett. B 628, 18 (2005).
J. Badier et al. (NA3 Collab.), “Experimental \({J \mathord{\left/ {\vphantom {J \psi }} \right. \kern-0em} \psi }\) hadronic production from 150 GeV/c to 280 GeV/c,” Z. Phys. C 20, 101 (1983).
J. Badier et al. (NA3 Collab.), “Evidence for \(\psi \psi \) production in \({{\pi }^{ - }}\) interactions at 150 GeV/c and 280 GeV/c,” Phys. Lett. B 114, 457 (1982).
J. Badier et al. (Saclay-CERN-College de France-Ecole Poly-Orsay Collab.), “A large acceptance spectrometer to study high mass muon pairs,” Nucl. Instrum. Methods Phys. Res. 175, 319 (1980).
R. E. Ecclestone and D. M. Scott, “Production of \(\psi \psi \) in pion-nucleon interactions by quark-anti-quark annihilation,” Phys. Lett. B 120, 237 (1983).
J. F. Amundson, O. J. P. Eboli, E. M. Gregores, and F. Halzen, “Colorless states in perturbative QCD: Charmonium and rapidity gaps,” Phys. Lett. B 372, 127 (1996).
R. Gavai, D. Kharzeev, H. Satz, G. A. Schuler, K. Sridhar, and R. Vogt, “Quarkonium production in hadronic collisions,” Int. J. Mod. Phys. A 10, 3043 (1995).
R. E. Nelson, R. Vogt, and A. D. Frawley, “Narrowing the uncertainty on the total charm cross section and its effect on the \({J \mathord{\left/ {\vphantom {J \psi }} \right. \kern-0em} \psi }\) cross section,” Phys. Rev. C 87, 014908 (2013).
R. Vogt, “Shadowing effects on J/ψ and \(\Upsilon \) production at energies available at the CERN Large Hadron Collider,” Phys. Rev. C 92, 034909 (2015).
Y. Q. Ma and R. Vogt, “Quarkonium production in an improved color evaporation model,” Phys. Rev. D: Part. Fields 94, 114029 (2016).
S. Koshkarev, “Phenomenological analysis of the possible impact of double parton scattering in double \(J{\text{/}}\psi \) production at the COMPASS detector using the CERN π– beam at 190 GeV/c,” arXiv: 1909.06195 [hep-ph].
T. Sjöstrand, S. Mrenna, and P. Z. Skands, “A brief introduction to PYTHIA 8.1,” Comput. Phys. Commun. 178, 852 (2008).
H. S. Shao, “HELAC-Onia: An automatic matrix element generator for heavy quarkonium physics,” Comput. Phys. Commun. 184, 2562 (2013).
H. S. Shao, “HELAC-Onia 2.0: An upgraded matrix-element and event generator for heavy quarkonium physics,” Comput. Phys. Commun. 198, 238 (2016).
R. Vogt and S. J. Brodsky, “Intrinsic charm contribution to double quarkonium hadroproduction,” Phys. Lett. B 349, 569 (1995).
R. Vogt, “QCD mechanisms for double quarkonium and open heavy meson hadroproduction,” Nucl. Phys. B 446, 159 (1995).
S. Koshkarev, “Groote, double quarkonium production at high Feynman-\(x\),” Nucl. Phys. B 915, 384 (2017).
S. Koshkarev and S. Groote, “Signals of the double intrinsic heavy quark at the current experiments,” J. Phys.: Conf. Ser. 938, 012054 (2017).
P. Abbon et al. (COMPASS Collab.), “The COMPASS setup for physics with hadron beams,” Nucl. Instrum. Methods Phys. Res., Sect. A 779, 69 (2015).
M. Aghasyan et al. (COMPASS Collab.), “First measurement of transverse-spin-dependent azimuthal asymmetries in the Drell-Yan process,” Phys. Rev. Lett. 119, 112002 (2017).
B. Humpert and P. Mery, “\(\psi \psi \) production by quarks, gluons and B mesons,” Phys. Lett. B 124, 265 (1983).
ACKNOWLEDGMENTS
We would like to thank H.S. Shao for updating the HELAC-Onia generator. Also we would like to thank D. Bandurin for useful discussions.
Funding
This research was supported by the European Regional Development Fund under Grant no. TK133, and by the Estonian Research Council under Grant no. PRG356.
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APPENDIX A
APPENDIX A
We already investigated possible contribution from SPS and IC mechanisms, and we even mentioned the contribution from DPS. However, it is possible to produce a pair of \({J \mathord{\left/ {\vphantom {J \psi }} \right. \kern-0em} \psi }\) mesons also by SPS–IC interference. In this case one of the \({J \mathord{\left/ {\vphantom {J \psi }} \right. \kern-0em} \psi }\) comes from IC and the other from a standard pQCD SPS process like gluon–gluon fusion or quark–antiquark annihilation.
As the \({J \mathord{\left/ {\vphantom {J \psi }} \right. \kern-0em} \psi }\) from IC is produced at the “surface” of the hadron or nucleus, we assume that IC mechanism always contributes first. Starting from the \({{x}_{F}}\) distributions in Fig. 7 for single \(J/\psi \) from IC (red histogram to the right) or SPS (blue histogram to the left), the double \(J/\psi \) distribution for SPS–IC interference is calculated under this assumption to be as shown in Fig. 8. It is easy to see that the present region of double \(J/\psi \) in the NA3 data does not support this production mechanism very much.
Prediction for the \({{x}_{{\text{F}}}}\) distributions of a single \({J \mathord{\left/ {\vphantom {J \psi }} \right. \kern-0em} \psi }\) for SPS (blue histogram to the left) and IC (red histogram to the right).
Prediction for the \({{x}_{{\text{F}}}}\) distributions of a \({J \mathord{\left/ {\vphantom {J \psi }} \right. \kern-0em} \psi }\) pair for SPS–IC interference.
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Gridin, A., Groote, S., Guskov, A. et al. Phenomenological Study for the Search of Evidence for Intrinsic Charm at the COMPASS Experiment. Phys. Part. Nuclei Lett. 17, 826–833 (2020). https://doi.org/10.1134/S1547477120060059
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DOI: https://doi.org/10.1134/S1547477120060059