002760074 001__ 2760074
002760074 005__ 20211112210808.0
002760074 0247_ $$2DOI$$9bibmatch$$a10.1140/epjc/s10052-019-7523-8
002760074 0248_ $$aoai:cds.cern.ch:2760074$$pcerncds:CERN$$pcerncds:CERN:FULLTEXT$$pcerncds:FULLTEXT
002760074 037__ $$9arXiv$$aarXiv:1906.10049$$chep-ph
002760074 035__ $$9arXiv$$aoai:arXiv.org:1906.10049
002760074 035__ $$9Inspire$$aoai:inspirehep.net:1740999$$d2021-11-11T11:14:39Z$$h2021-11-12T03:08:12Z$$mmarcxml$$ttrue$$uhttps://inspirehep.net/api/oai2d
002760074 035__ $$9Inspire$$a1740999
002760074 041__ $$aeng
002760074 100__ $$aLansberg, [email protected]$$tGRID:grid.5842.b$$uOrsay, IPN$$vIPNO, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France
002760074 245__ $$9Springer$$aPrompt ${J/\psi}$-pair production at the LHC: impact of loop-induced contributions and of the colour-octet mechanism
002760074 260__ $$c2019-12-13
002760074 269__ $$c2019-06-24
002760074 300__ $$a27 p
002760074 500__ $$9arXiv$$a32 pages, 21 figures, 3 tables
002760074 520__ $$9Springer$$aPrompt double-$J/\psi $ production at high-energy hadron colliders can be considered as a golden channel to probe double parton scatterings (DPS)—in particular to study gluon–gluon correlations inside the proton—and, at the same time, to measure the distribution of linearly-polarised gluons inside the proton. Such studies, however, require a good control of both single parton scatterings (SPS) and DPS in the respective regions where they are carried out. In this context, we have critically examined two mechanisms of SPS that may be kinematically enhanced where DPS are thought to be dominant, even though they are either at higher orders in the strong-coupling or velocity expansion. First, we have considered a gauge-invariant and infrared-safe subset of the loop-induced contribution via colour-singlet (CS) transitions. We have found it to become the leading CS SPS contributions at large rapidity separation, yet too small to account for the data without invoking the presence of DPS yields. Second, we have surveyed the possible colour-octet (CO) contributions using both old and up-to-date non-perturbative long-distance matrix elements (LDMEs). We have found that the pure CO yields crucially depend on the LDMEs. Among all the LDMEs we used, only two result into a visible modification of the NRQCD (CS+CO) yield, but only in two kinematical distributions measured by ATLAS, those of the rapidity separation and of the pair invariant mass. These modifications, however, do not impact the control region used for their DPS study.
002760074 520__ $$9arXiv$$aPrompt double-$J/\psi$ production at high-energy hadron colliders can be considered as a golden channel to probe double parton scatterings (DPS) --in particular to study gluon-gluon correlations inside the proton-- and, at the same time, to measure the distribution of linearly-polarised gluons inside the proton. Such studies however require a good control of both single and DPS in the respective regions where they are carried out. In this context, we have critically examined two mechanisms of single parton scatterings (SPS) that may be kinematically enhanced where DPS are thought to be dominant, even though they are either at higher orders in the strong-coupling or velocity expansion. First, we have considered a gauge-invariant and infrared-safe subset of the loop-induced contribution via Colour-Singlet (CS) transitions. We have found it to become the leading CS SPS contributions at large rapidity separation, yet too small to account for the data without invoking the presence of DPS yields. Second, we have surveyed the possible Colour-Octet (CO) contributions using both old and up-to-date non-perturbative long distance matrix elements (LDMEs). We have found that the pure CO yields crucially depend on the LDMEs. Among all the LDMEs we used, only two result into a visible modification of the NRQCD (CS+CO) yield, but only in two kinematical distributions measured by ATLAS, those of the rapidity separation and of the pair invariant mass. These modifications however do not impact the control region used for their DPS study.
002760074 540__ $$3preprint$$aarXiv nonexclusive-distrib 1.0$$uhttp://arxiv.org/licenses/nonexclusive-distrib/1.0/
002760074 540__ $$aCC-BY-4.0$$bSpringer
002760074 65017 $$2arXiv$$anucl-th
002760074 65017 $$2SzGeCERN$$aNuclear Physics - Theory
002760074 65017 $$2arXiv$$anucl-ex
002760074 65017 $$2SzGeCERN$$aNuclear Physics - Experiment
002760074 65017 $$2arXiv$$ahep-ex
002760074 65017 $$2SzGeCERN$$aParticle Physics - Experiment
002760074 65017 $$2arXiv$$ahep-ph
002760074 65017 $$2SzGeCERN$$aParticle Physics - Phenomenology
002760074 690C_ $$aCERN
002760074 690C_ $$aARTICLE
002760074 693__ $$aCERN LHC
002760074 700__ $$aShao, [email protected]$$tGRID:grid.462844.8$$uParis, LPTHE$$vLaboratoire de Physique Théorique et Hautes Energies (LPTHE), UMR 7589, Sorbonne Université et CNRS, 4 place Jussieu, 75252, Cedex 05 Paris, France
002760074 700__ $$aYamanaka, [email protected]$$tGRID:grid.5842.b$$tGRID:grid.258799.8$$uKyoto U., Yukawa Inst., Kyoto$$uOrsay, IPN$$vIPNO, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France$$vYukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa-Oiwake, 606-8502 Kyoto, Japan
002760074 700__ $$aZhang, [email protected]$$tGRID:grid.64939.31$$tGRID:grid.11135.37$$uBeihang U.$$uPeking U., CHEP$$vSchool of Physics and Nuclear Energy Engineering, Beihang University, 100083 Beijing, China$$vCenter for High Energy Physics, Peking University, 100871 Beijing, China
002760074 773__ $$c1006$$n12$$pEur. Phys. J. C$$v79$$y2019
002760074 8564_ $$82287299$$s1518106$$uhttp://cds.cern.ch/record/2760074/files/1906.10049.pdf$$yFulltext
002760074 8564_ $$82287300$$s11601391$$uhttp://cds.cern.ch/record/2760074/files/scoap3-fulltext.pdf$$yArticle from SCOAP3
002760074 8564_ $$82334361$$s11601391$$uhttp://cds.cern.ch/record/2760074/files/scoap.pdf$$yArticle from SCOAP3
002760074 960__ $$a13
002760074 980__ $$aARTICLE