학술논문
Observation of e+e-→η′J/ψ at center-of-mass energies between 4.189 and 4.600 GeV
Document Type
article
Author
Ablikim, M; Achasov, MN; Ahmed, S; Ai, XC; Albayrak, O; Albrecht, M; Ambrose, DJ; Amoroso, A; An, FF; An, Q; Bai, JZ; Ferroli, R Baldini; Ban, Y; Bennett, DW; Bennett, JV; Berger, N; Bertani, M; Bettoni, D; Bian, JM; Bianchi, F; Boger, E; Boyko, I; Briere, RA; Cai, H; Cai, X; Cakir, O; Calcaterra, A; Cao, GF; Cetin, SA; Chang, JF; Chelkov, G; Chen, G; Chen, HS; Chen, HY; Chen, JC; Chen, ML; Chen, S; Chen, SJ; Chen, X; Chen, XR; Chen, YB; Cheng, HP; Chu, XK; Cibinetto, G; Dai, HL; Dai, JP; Dbeyssi, A; Dedovich, D; Deng, ZY; Denig, A; Denysenko, I; Destefanis, M; De Mori, F; Ding, Y; Dong, C; Dong, J; Dong, LY; Dong, MY; Dou, ZL; Du, SX; Duan, PF; Fan, JZ; Fang, J; Fang, SS; Fang, X; Fang, Y; Farinelli, R; Fava, L; Fedorov, O; Feldbauer, F; Felici, G; Feng, CQ; Fioravanti, E; Fritsch, M; Fu, CD; Gao, Q; Gao, XL; Gao, XY; Gao, Y; Gao, Z; Garzia, I; Goetzen, K; Gong, L; Gong, WX; Gradl, W; Greco, M; Gu, MH; Gu, YT; Guan, YH; Guo, AQ; Guo, LB; Guo, RP; Guo, Y; Guo, YP; Haddadi, Z; Hafner, A; Han, S; Hao, XQ; Harris, FA; He, KL
Source
Physical Review D. 94(3)
Subject
Language
Abstract
The differential cross-section for pair production of top quarks with high transverse momentum is measured in 20.3 fb-1 of proton-proton collisions at a center-of-mass energy of 8 TeV. The measurement is performed for tt¯ events in the lepton+jets channel. The cross-section is reported as a function of the hadronically decaying top quark transverse momentum for values above 300 GeV. The hadronically decaying top quark is reconstructed as an anti-kt jet with radius parameter R=1.0 and identified with jet substructure techniques. The observed yield is corrected for detector effects to obtain a cross-section at particle level in a fiducial region close to the event selection. A parton-level cross-section extrapolated to the full phase space is also reported for top quarks with transverse momentum above 300 GeV. The predictions of a majority of next-to-leading-order and leading-order matrix-element Monte Carlo generators are found to agree with the measured cross-sections.