Triple-parton scatterings in proton–nucleus collisions at high energies
Abstract A generic expression to compute triple-parton scattering (TPS) cross sections in high-energy proton–nucleus (pA) collisions is derived as a function of the corresponding single-parton cross sections and an effective parameter encoding the transverse parton profile of the proton. The TPS cro...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-05-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-018-5687-2 |
| _version_ | 1818386873688522752 |
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| author | David d’Enterria Alexander M. Snigirev |
| author_facet | David d’Enterria Alexander M. Snigirev |
| author_sort | David d’Enterria |
| collection | DOAJ |
| description | Abstract A generic expression to compute triple-parton scattering (TPS) cross sections in high-energy proton–nucleus (pA) collisions is derived as a function of the corresponding single-parton cross sections and an effective parameter encoding the transverse parton profile of the proton. The TPS cross sections are enhanced by a factor of about $$9\,A\simeq 2000$$ 9A≃2000 in pPb as compared to those in proton–nucleon collisions at the same center-of-mass energy. Estimates for triple charm ($$\mathrm{c}\overline{\mathrm{c}}$$ cc¯ ) and bottom ($$\mathrm{b}\overline{\mathrm{b}}$$ bb¯ ) production in pPb collisions at LHC and FCC energies are presented based on next-to-next-to-leading-order calculations for $$\mathrm{c}\overline{\mathrm{c}}$$ cc¯ and $$\mathrm{b}\overline{\mathrm{b}}$$ bb¯ single-parton cross sections. At $$\sqrt{s_{_{\textsc {nn}}}}= 8.8$$ sNN=8.8 TeV, about 10% of the pPb events have three $$\mathrm{c}\overline{\mathrm{c}}$$ cc¯ pairs produced in separate partonic interactions. At $$\sqrt{s_{_{\textsc {nn}}}}= 63$$ sNN=63 TeV, the pPb cross sections for triple-$$J/\psi $$ J/ψ and triple-$$\mathrm{b}\overline{\mathrm{b}}$$ bb¯ are $${{\mathscr {O}}}$$ O (1–10 mb). In the most energetic collisions of cosmic rays in the upper atmosphere, equivalent to $$\sqrt{s_{_{\textsc {nn}}}}\approx $$ sNN≈ 400 TeV, the TPS $$\mathrm{c}\overline{\mathrm{c}}$$ cc¯ cross section equals the total p–Air inelastic cross section. |
| first_indexed | 2024-12-14T04:00:58Z |
| format | Article |
| id | doaj.art-d7f121a476914fd398d61d50aa76a974 |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-14T04:00:58Z |
| publishDate | 2018-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-d7f121a476914fd398d61d50aa76a9742022-12-21T23:17:57ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522018-05-017851710.1140/epjc/s10052-018-5687-2Triple-parton scatterings in proton–nucleus collisions at high energiesDavid d’Enterria0Alexander M. Snigirev1EP Department, CERNSkobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State UniversityAbstract A generic expression to compute triple-parton scattering (TPS) cross sections in high-energy proton–nucleus (pA) collisions is derived as a function of the corresponding single-parton cross sections and an effective parameter encoding the transverse parton profile of the proton. The TPS cross sections are enhanced by a factor of about $$9\,A\simeq 2000$$ 9A≃2000 in pPb as compared to those in proton–nucleon collisions at the same center-of-mass energy. Estimates for triple charm ($$\mathrm{c}\overline{\mathrm{c}}$$ cc¯ ) and bottom ($$\mathrm{b}\overline{\mathrm{b}}$$ bb¯ ) production in pPb collisions at LHC and FCC energies are presented based on next-to-next-to-leading-order calculations for $$\mathrm{c}\overline{\mathrm{c}}$$ cc¯ and $$\mathrm{b}\overline{\mathrm{b}}$$ bb¯ single-parton cross sections. At $$\sqrt{s_{_{\textsc {nn}}}}= 8.8$$ sNN=8.8 TeV, about 10% of the pPb events have three $$\mathrm{c}\overline{\mathrm{c}}$$ cc¯ pairs produced in separate partonic interactions. At $$\sqrt{s_{_{\textsc {nn}}}}= 63$$ sNN=63 TeV, the pPb cross sections for triple-$$J/\psi $$ J/ψ and triple-$$\mathrm{b}\overline{\mathrm{b}}$$ bb¯ are $${{\mathscr {O}}}$$ O (1–10 mb). In the most energetic collisions of cosmic rays in the upper atmosphere, equivalent to $$\sqrt{s_{_{\textsc {nn}}}}\approx $$ sNN≈ 400 TeV, the TPS $$\mathrm{c}\overline{\mathrm{c}}$$ cc¯ cross section equals the total p–Air inelastic cross section.http://link.springer.com/article/10.1140/epjc/s10052-018-5687-2 |
| spellingShingle | David d’Enterria Alexander M. Snigirev Triple-parton scatterings in proton–nucleus collisions at high energies European Physical Journal C: Particles and Fields |
| title | Triple-parton scatterings in proton–nucleus collisions at high energies |
| title_full | Triple-parton scatterings in proton–nucleus collisions at high energies |
| title_fullStr | Triple-parton scatterings in proton–nucleus collisions at high energies |
| title_full_unstemmed | Triple-parton scatterings in proton–nucleus collisions at high energies |
| title_short | Triple-parton scatterings in proton–nucleus collisions at high energies |
| title_sort | triple parton scatterings in proton nucleus collisions at high energies |
| url | http://link.springer.com/article/10.1140/epjc/s10052-018-5687-2 |
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