Measurement of beauty and charm production in pp collisions at $$ \sqrt{s} $$ = 5.02 TeV via non-prompt and prompt D mesons
Measurement of beauty and charm production in pp collisions at $$ \sqrt{s} $$ = 5.02 TeV via non-prompt and prompt D mesons
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通过非瞬发和瞬发 D 介子测量 $$ sqrt{s} $$ = 5.02 TeV 的 pp 碰撞中美丽和魅力的产生
DOI：
10.1007/jhep05(2021)220
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发表时间：
2021
影响因子：
5.4
通讯作者：
Ahn, S. U.
中科院分区：
文献类型：
--
作者：
Acharya, S.;Adamová, D.;Adler, A.;Adolfsson, J.;Aglieri Rinella, G.;Agnello, M.;Agrawal, N.;Ahammed, Z.;Ahmad, S.;Ahn, S. U.
The p T-differential production cross sections of prompt and non-prompt (produced in beauty-hadron decays) D mesons were measured by the ALICE experiment at midrapidity (| y|< 0. 5) in proton-proton collisions at= 5. 02 TeV. The data sample used in the analysis corresponds to an integrated luminosity of (19. 3±0. 4) nb− 1. D mesons were reconstructed from their decays D 0→ K− π+, D+→ K− π+ π+, and\({\mathrm {D}} _ {\mathrm {s}}^{+}\to\upphi {\uppi}^{+}\to {\mathrm {K}}^{-}{\mathrm {K}}^{+}{\uppi}^{+}\) and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt D+ andmesons have an extended p T coverage and total uncertainties reduced by a factor ranging from 1.05 to 1.6, depending on p T, allowing for a more precise determination of their p T-integrated cross sections. The results are well described by perturbative QCD calculations. The fragmentation fraction of heavy quarks to strange mesons divided by the one to non-strange mesons, f s/(f u+ f d), is compatible for charm and beauty quarks and with previous measurements at different centre-of-mass energies and collision systems. Theproduction cross section per rapidity unit at midrapidity, estimated from non-prompt D-meson measurements, is\(\mathrm {d}{\sigma} _ {\mathrm {b}\overline {\mathrm {b}}}/\mathrm {d} y\left|{} _ {\left|\mathrm {y}\right|< 0.5}= 34.5\pm 2.4 {\left (\mathrm {stat}\right)} _ {-2.9}^{+ 4.7}\left (\mathrm {tot}.\mathrm {syst}\right)\right.\) μb. It is compatible with previous measurements at the same centre-of-mass energy and with the cross section pre-dicted by perturbative QCD calculations.
The p T-differential production cross sections of prompt and non-prompt (produced in beauty-hadron decays) D mesons were measured by the ALICE experiment at midrapidity (| y|< 0. 5) in proton-proton collisions at= 5. 02 TeV. The data sample used in the analysis corresponds to an integrated luminosity of (19. 3±0. 4) nb− 1. D mesons were reconstructed from their decays D 0→ K− π+, D+→ K− π+ π+, and\({\mathrm {D}} _ {\mathrm {s}}^{+}\to\upphi {\uppi}^{+}\to {\mathrm {K}}^{-}{\mathrm {K}}^{+}{\uppi}^{+}\) and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt D+ andmesons have an extended p T coverage and total uncertainties reduced by a factor ranging from 1.05 to 1.6, depending on p T, allowing for a more precise determination of their p T-integrated cross sections. The results are well described by perturbative QCD calculations. The fragmentation fraction of heavy quarks to strange mesons divided by the one to non-strange mesons, f s/(f u+ f d), is compatible for charm and beauty quarks and with previous measurements at different centre-of-mass energies and collision systems. Theproduction cross section per rapidity unit at midrapidity, estimated from non-prompt D-meson measurements, is\(\mathrm {d}{\sigma} _ {\mathrm {b}\overline {\mathrm {b}}}/\mathrm {d} y\left|{} _ {\left|\mathrm {y}\right|< 0.5}= 34.5\pm 2.4 {\left (\mathrm {stat}\right)} _ {-2.9}^{+ 4.7}\left (\mathrm {tot}.\mathrm {syst}\right)\right.\) μb. It is compatible with previous measurements at the same centre-of-mass energy and with the cross section pre-dicted by perturbative QCD calculations.