Reassessing the importance of the colour-singlet contributions to direct J/ψ+WJ/ψ+W production at the LHC and the Tevatron

Abstract : We have found out that our evaluation of the dominant χcχc feed-down contributions to J/ψ+WJ/ψ+W (Subsection 5.3) was incorrect. We overlooked the fact that the View the MathML sourceααs3 contributions via the colour-singlet transition are infrared sensitive and cannot be evaluated without that from colour-octet transitions. One should in fact compute the contributions at order View the MathML sourceααs2 via quark–antiquark annihilation and via a View the MathML sourceS1[8]3 transition exactly as for the colour-octet contributions to the direct yield of J/ψ+WJ/ψ+W. Using View the MathML source〈OχcJ(S1[8]3)〉=(2J+1)×2×10−3 GeV3[1], the feed-down contribution for the ATLAS kinematical coverage (see Section 5.1 or [2]) is on the order of 0.45 fb. As a consequence, in the first paragraph of 5.3, the 3 last sentences should be replaced by “We have found that the cross section for χc+Wχc+W times the branching for χc→J/ψ+γχc→J/ψ+γ is three-fourths of the direct contribution, which we have found to be 0.6±0.2 fb0.6±0.2 fb with all the cuts and relevant branchings.” In the second paragraph of 5.3, “[...] σ(|y|<2.4)=4.5±2.3 fbσ(|y|<2.4)=4.5±2.3 fb at 7 TeV, comparable to the cross-section σ(|y|<2.4)=15±10 fbσ(|y|<2.4)=15±10 fb for [...]” should also be replaced by “[...] View the MathML sourceσ(|yψ|<2.1,PTψ>8.5 GeV)=1.2±0.25 fb at 7 TeV, more than one standard deviation below the cross-section View the MathML sourceσ(|yψ|<2.1,PTψ>8.5 GeV)=15±10 fb for [...]”. We stress that this mistake only affects Subsection 5.3. In no respect, the main results of the paper and its conclusions are altered.
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Physics Letters B, Elsevier, 2014, 738, pp.529. 〈10.1016/j.physletb.2014.10.015〉
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http://hal.in2p3.fr/in2p3-01103355
Contributeur : Sophie Heurteau <>
Soumis le : mercredi 14 janvier 2015 - 15:17:57
Dernière modification le : jeudi 11 janvier 2018 - 06:12:40

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J.P. Lansberg, C. Lorcé. Reassessing the importance of the colour-singlet contributions to direct J/ψ+WJ/ψ+W production at the LHC and the Tevatron. Physics Letters B, Elsevier, 2014, 738, pp.529. 〈10.1016/j.physletb.2014.10.015〉. 〈in2p3-01103355〉

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