Measurement of the production cross section of prompt $Ξ^0_{\rm c}$ baryons in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}~=~5.02$ TeV
Fuente:
arXiv
Saved in:
| Main Author: | |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866916591298412544 |
|---|---|
| author | ALICE Collaboration |
| author_facet | ALICE Collaboration |
| contents | The transverse momentum ($p_{\rm T}$) differential production cross section of the promptly produced charm-strange baryon $Ξ_{\rm c}^{0}$ (and its charge conjugate $\overline{Ξ_{\rm c}^{0}}$) is measured at midrapidity via its hadronic decay into ${\rm π^{+}}Ξ^{-}$ in p$-$Pb collisions at a centre-of-mass energy per nucleon$-$nucleon collision $\sqrt{s_{\mathrm{NN}}}~=~5.02$ TeV with the ALICE detector at the LHC. The $Ξ_{\rm c}^{0}$ nuclear modification factor ($R_{\rm pPb}$), calculated from the cross sections in pp and p$-$Pb collisions, is presented and compared with the $R_{\rm pPb}$ of $Λ_{\rm c}^{+}$ baryons. The ratios between the $p_{\rm T}$-differential production cross section of $Ξ_{\rm c}^{0}$ baryons and those of $\mathrm {D^0}$ mesons and $Λ_{\rm c}^{+}$ baryons are also reported and compared with results at forward and backward rapidity from the LHCb Collaboration. The measurements of the production cross section of prompt $Ξ^0_{\rm c}$ baryons are compared with a model based on perturbative QCD calculations of charm-quark production cross sections, which includes only cold nuclear matter effects in p$-$Pb collisions, and underestimates the measurement by a factor of about 50. This discrepancy is reduced when the data is compared with a model that includes string formation beyond leading-colour approximation or in which hadronisation is implemented via quark coalescence. The $p_{\rm T}$-integrated cross section of prompt $Ξ^0_{\rm c}$-baryon production at midrapidity extrapolated down to $p_{\rm T}$ = 0 is also reported. These measurements offer insights and constraints for theoretical calculations of the hadronisation process. Additionally, they provide inputs for the calculation of the charm production cross section in p$-$Pb collisions at midrapidity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_14538 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Measurement of the production cross section of prompt $Ξ^0_{\rm c}$ baryons in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}~=~5.02$ TeV ALICE Collaboration Nuclear Experiment High Energy Physics - Experiment The transverse momentum ($p_{\rm T}$) differential production cross section of the promptly produced charm-strange baryon $Ξ_{\rm c}^{0}$ (and its charge conjugate $\overline{Ξ_{\rm c}^{0}}$) is measured at midrapidity via its hadronic decay into ${\rm π^{+}}Ξ^{-}$ in p$-$Pb collisions at a centre-of-mass energy per nucleon$-$nucleon collision $\sqrt{s_{\mathrm{NN}}}~=~5.02$ TeV with the ALICE detector at the LHC. The $Ξ_{\rm c}^{0}$ nuclear modification factor ($R_{\rm pPb}$), calculated from the cross sections in pp and p$-$Pb collisions, is presented and compared with the $R_{\rm pPb}$ of $Λ_{\rm c}^{+}$ baryons. The ratios between the $p_{\rm T}$-differential production cross section of $Ξ_{\rm c}^{0}$ baryons and those of $\mathrm {D^0}$ mesons and $Λ_{\rm c}^{+}$ baryons are also reported and compared with results at forward and backward rapidity from the LHCb Collaboration. The measurements of the production cross section of prompt $Ξ^0_{\rm c}$ baryons are compared with a model based on perturbative QCD calculations of charm-quark production cross sections, which includes only cold nuclear matter effects in p$-$Pb collisions, and underestimates the measurement by a factor of about 50. This discrepancy is reduced when the data is compared with a model that includes string formation beyond leading-colour approximation or in which hadronisation is implemented via quark coalescence. The $p_{\rm T}$-integrated cross section of prompt $Ξ^0_{\rm c}$-baryon production at midrapidity extrapolated down to $p_{\rm T}$ = 0 is also reported. These measurements offer insights and constraints for theoretical calculations of the hadronisation process. Additionally, they provide inputs for the calculation of the charm production cross section in p$-$Pb collisions at midrapidity. |
| title | Measurement of the production cross section of prompt $Ξ^0_{\rm c}$ baryons in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}~=~5.02$ TeV |
| topic | Nuclear Experiment High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2405.14538 |