Abstract
A new method for matching calculations in the leading approximation in the kT-factorization approach with the higher-order contributions of perturbation theory, which appear due to the emission of additional hard partons, is proposed. In the proposed method, azimuthal correlations between the leading and subleading jets in a multijet event are considered. The calculations are carried out within the parton Reggeization approach (PRA) that is based on kT-factorization of hard processes in multi-Regge kinematics, the Kimber–Martin–Ryskin model for nonintegrated parton distribution functions (nPDF), and the effective field theory of Reggeized gluons and quarks proposed by L.N. Lipatov. Theoretical predictions are compared with the CMS collaboration data collected at the Large Hadron Collider at energy \(\sqrt S = 13\) TeV.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
REFERENCES
V. Khachatryan et al. (CMS Collab.), “Dijet azimuthal decorrelations in \(pp\) collisions at \(\sqrt S = 7\) TeV,” Phys. Rev. Lett. 106, 122003 (2011).
A. M. Sirunyan, A. Tumasyan, W. Adam, et al., “Azimuthal correlations for inclusive 2-jet, 3-jet, and 4-jet events in pp collisions at \(\sqrt S = 13\) TeV,” Eur. Phys. J. C 78, 566 (2018).
G. Aad et al. (ATLAS Collab.), “Measurement of dijet azimuthal decorrelations in \(pp\) collisions at \(\sqrt S = 7\) TeV,” Phys. Rev. Lett. 106, 172002 (2011).
Z. Nagy and D. E. Soper, “What is a parton shower?” Phys. Rev. D 98, 014034 (2018).
S. Frixione and B. R. Webber, “Matching NLO QCD computations and parton shower simulations,” JHEP, 0206, 029 (2002).
S. Catani, F. Krauss, R. Kuhn, and B. R. Webber, “QCD matrix elements + parton showers,” JHEP, 111, 063 (2001)
S. Mrenna and P. Richardson, “Matching matrix elements and parton showers with HERWIG and PYTHIA,” JHEP, 05, 040 (2004).
S. Frixione, P. Nason, and C. Oleari, “Matching NLO QCD computations with parton shower simulations: the POWHEG method,” JHEP, 11, 070 (2007).
R. Frederix and S. Frixione, “Merging meets matching in MC@NLO,” JHEP, 12, 061 (2012).
J. C. Collins and R. K. Ellis, “Heavy quark production in very high-energy hadron collisions,” Nucl. Phys. B360, 3 (1991).
S. Catani, M. Ciafaloni, F. Hautmann, “High-energy factorization and small x heavy flavor production,” Nucl. Phys. B366, 135–188 (1991).
L. V. Gribov, E. M. Levin, and M. G. Ryskin, “Semihard processes in QCD,” Phys. Rept. 100, 1 (1983).
E. A. Kuraev, L. N. Lipatov, and V. S. Fadin, “Multi-reggeon processes in the Yang–Mills theory,” Sov. Phys. JETP, 44, 443 (1976);
E. A. Kuraev, L. N. Lipatov, and V. S. Fadin, “The Pomeranchuk singularity in non-Abelian gauge theories,” Sov. Phys. JETP, 45, 199 (1977);
Y. Y. Balitsky and L. N. Lipatov, “The Pomeranchuk singularity in Quantum Chromodynamics,” Sov. J. Nucl. Phys. 28, 822 (1978).
V. S. Fadin and L. N. Lipatov, “Radiative corrections to QCD scattering amplitudes in a multi-Regge kinematics,” Nucl. Phys. B406, 259 (1993).
V. S. Fadin, M. G. Kozlov, and A. V. Reznichenko, “Gluon Reggeization in Yang-Mills theories,” Phys. Rev. D 8, 085044 (2015) https://doi.org/10.1103/PhysRevD.92.085044 [arXiv: 1507.00823 [hep-th]]; V. S. Fadin, R. Fiore, M. G. Kozlov, and A. V. Reznichenko, “Proof of the multi-Regge form of QCD amplitudes with gluon exchanges in the NLA,” Phys. Lett. B 639, 74 (2006); https://doi.org/10.1016/j.physletb.2006.03.031 [hep-ph/0602006].
A. V. Karpishkov, M. A. Nefedov, and V. A. Saleev, “\(B\bar {B}\) angular correlations at the LHC in parton Reggeization approach merged with higher-order matrix elements,” Phys. Rev. D96, 096019 (2017).
M. A. Nefedov, V. A. Saleev, and A.V. Shipilova, “Dijet azimuthal decorrelations at the LHC in the parton Reggeization approach,” Phys. Rev. D87, 094030 (2013).
M. Bury, A. van Hameren, H. Jung, K. Kutak, S. Sapeta, and M. Serino, “Calculations with off-shell matrix elements, TMD parton densities and TMD parton showers,” Eur. Phys. J. C78, 137 (2018);
A. B. Martinez, P. Connor, F. Hautmann, et al., “Determination and application of TMD parton densities using the Parton Branching method,” Proc. of Seminar DIS2018, 013 (2018).
A. van Hameren, “KaTie: For parton-level event generation with kT-dependent initial states,” Comput. Phys. Commun. 224, 371 (2018).
H. Jung, S. Baranov, M. Deak, A. Grebenyuk, et al., “The CCFM Monte Carlo generator CASCADE version 2.2.03,” Eur. Phys. J. C70, 1237 (2010).
M. A. Kimber, A. D. Martin, and M. G. Ryskin, “Unintegrated parton distributions and prompt photon hadroproduction,” Eur. Phys. J. C12, 655 (2000).
L. N. Lipatov, “Gauge invariant effective action for high energy processes in QCD,” Nucl. Phys. B452, 369 (1995).
L. N. Lipatov and M. I. Vyazovsky, “Quasi-multi-Regge processes with a quark exchange in the t-channel,” Nucl. Phys. B597, 399 (2001).
V. A. Saleev and A. V. Shipilova, “Inclusive b-jet and bb-dijet production at the LHC via Reggeized gluons,” Phys. Rev. D86, 034032 (2012).
R. Maciula, V. A. Saleev, A. V. Shipilova, and A. Szczurek, “New mechanisms for double charmed meson production at the LHCb,” Phys. Lett. B758, 458 (2016).
A. V. Karpishkov, M. A. Nefedov, V. A. Saleev, and A. V. Shipilova, “B-meson production in the parton Reggeization approach at Tevatron and the LHC,” Int. J. Mod. Phys. A30, 1550023 (2015).
K. Kutak, R. Maciula, M. Serino, A. Szczurek, and A. van Hameren, “Four-jet production in single- and double-parton scattering within high-energy factorization,” JHEP, 1604, 175 (2016).
M. Bury and A. van Hameren, “Numerical evaluation of multi-gluon amplitudes for high energy factorization,” Comput. Phys. Commun. 196, 592 (2015).
M. Cacciari, G. P. Salam, and G. Soyez, “The anti-\({{k}_{t}}\) jet clustering algorithm,” JHEP, 04, 063 (2008).
ACKNOWLEDGMENTS
The authors are grateful to the II Institute for Theoretical Physics, Hamburg University, and personally to Prof. B.A. Kniehl for the computing time provided by him at the Computing Cluster of the Particle Phenomenology Group.
Funding
The paper was supported by the Foundation for the Advancement of Theoretical Physics and Mathematics “BASIS,” project no. N-18-1-1-30-1, and by the Ministry of education and science of Russia by State assignment to educational and research institutions under project FSSS-2020-0014.
Author information
Authors and Affiliations
Corresponding authors
Additional information
Translated by N. Semenova
Rights and permissions
About this article
Cite this article
Nefedov, M.A., Saleev, V.A. Two-Jet Correlations in Multijet Events in the Regge Limit of QCD. Phys. Part. Nuclei 51, 714–719 (2020). https://doi.org/10.1134/S1063779620040528
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1063779620040528