Revisiting the soft-hard separation in the transverse momentum spectra of $pp$ collisions
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911203597484032 |
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| author | Bíró, Gábor Paić, Guy Serkin, Leonid Barnaföldi, Gergely Gábor |
| author_facet | Bíró, Gábor Paić, Guy Serkin, Leonid Barnaföldi, Gergely Gábor |
| contents | We study the separation of soft and hard components in the transverse momentum spectra of charged particles as measured by ALICE in proton-proton collisions at $\sqrt{s}= 2.76 TeV, 5.02 TeV and 13 TeV at the LHC. The soft component is described by a Boltzmann fit, while the residual spectra are identified as hard QCD-like fragmentation. After separation, the subtracted spectra show no evolution in the shape or peak position with multiplicity, supporting a two-component interpretation. Mean transverse momenta for both contributions remain nearly constant, while Pythia 8 Monte Carlo simulations confirm these trends. Our results support the two-component description as a robust alternative to hydrodynamical interpretations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_09692 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Revisiting the soft-hard separation in the transverse momentum spectra of $pp$ collisions Bíró, Gábor Paić, Guy Serkin, Leonid Barnaföldi, Gergely Gábor High Energy Physics - Phenomenology Nuclear Theory We study the separation of soft and hard components in the transverse momentum spectra of charged particles as measured by ALICE in proton-proton collisions at $\sqrt{s}= 2.76 TeV, 5.02 TeV and 13 TeV at the LHC. The soft component is described by a Boltzmann fit, while the residual spectra are identified as hard QCD-like fragmentation. After separation, the subtracted spectra show no evolution in the shape or peak position with multiplicity, supporting a two-component interpretation. Mean transverse momenta for both contributions remain nearly constant, while Pythia 8 Monte Carlo simulations confirm these trends. Our results support the two-component description as a robust alternative to hydrodynamical interpretations. |
| title | Revisiting the soft-hard separation in the transverse momentum spectra of $pp$ collisions |
| topic | High Energy Physics - Phenomenology Nuclear Theory |
| url | https://arxiv.org/abs/2510.09692 |