Erratum to: Measurement of the J/ψ pair production cross-section in pp collisions at s = 13 $$ \sqrt{s}=13 $$ TeV

Abstract

Erratum: Measurement of the J/ψ pair production cross-section in pp collisions at √ s = 13 TeVThe LHCb collaboration E-mail: liupan.an@cern.ch Erratum to: JHEP06(2017)047ArXiv ePrint: 1612.07451The measurement of the differential cross-section as a function of p T (J/ψ J/ψ ) was incorrectly reported in the paper [1], due to an incorrect propagation of the efficiency values in the final analysis. In this erratum, all tables and figures that need to be corrected are reported, with identical numbering and captions to those in the orginial paper. In figure 2, only the data points are changed. In figure 9, the results of templated double parton scattering (DPS) fit for dσ(J/ψ J/ψ ) dp T (J/ψ J/ψ ) (the left column) are changed. In table 3, the percentages of the DPS component determined with p T (J/ψ J/ψ ) (the first row) are changed. In table 4, the σ eff values from the DPS fits for p T (J/ψ J/ψ ) (the first row) are changed. As a result, the values of σ eff for the models considered in the analysis are between 8.8 and 12.5 mb, instead of 10.0 and 12.5 mb. None of these changes affect the interpretation of the results and the conclusions.

Hadronic structure from double parton scattering

“…In particular, we consider the DPS production of double quarkonia and of high mass final states, since this final state discrimination appears to be correlated with the extracted value of σ eff . Therefore, we consider recent LHC analyses in which σ eff is extracted in the double J=Ψ channel by the LHCb [10], ATLAS [14], and by the authors of Ref. [15] based on CMS data, in the 4-jets channel by ATLAS [11], and in the W þ 2 jets and same sign WW channels analyzed by CMS [12,13].…”

“…The effective cross section has been extracted, although in a model dependent way, in several experiments; see recent results in Refs. [10][11][12][13][14][15]. The purpose of the present paper is to demonstrate that, by exploiting the maximum information encoded in σ eff and by using almost the same assumptions used in its experimental extraction, a range of mean distances, characterizing the interacting parton pair, can be derived.…”

Production of χc pairs with large rapidity separation in kT factorization

“…Recently, cross sections for the production of J=ψ-pairs were measured at the Tevatron [1] and the LHC [2][3][4][5]. There remain a number of puzzles, especially with the CMS and ATLAS data.…”

Study of Double Parton Scattering Processes with Heavy Quarks

“…First observed by the NA3 experiment in pion-nucleon [71] and proton-nucleon [72] interactions, the J/ψ pair production was later studied both in pp collisions at the Tevatron by D0 collaboration and in pp collisions at different energies at the LHC [51,54,73,74] by ATLAS, CMS and LHCb collaborations.…”

“…related to jet reconstuction or jet-energy calibration. Currently practically all (experimental) knowledge of DPS processes in very interesting and important kinematic region x 1 , x 2 x 1 , x 2 comes from the measurements involving heavy-quarks [51][52][53][54] in the forward region, where studies with e.g. light quarks (jets) and/or the direct photons are experimentally challenging.…”