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| Natura: | Preprint |
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2024
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| Accesso online: | https://arxiv.org/abs/2410.17360 |
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| _version_ | 1866913560117903360 |
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| author | Trainor, Thomas A. |
| author_facet | Trainor, Thomas A. |
| contents | In this study fixed-target spectra obtained by the Chicago-Princeton (C-P) collaboration at Fermilab in the mid seventies are analyzed with a two-component spectrum model (TCM) that has been applied successfully to a number of collision systems at the RHIC and LHC in the past. It is from C-P data that the Cronin effect was first inferred. TCM analysis leads to factorization of collision-energy and target A dependences. Over the energy range of C-P data energy dependence is restricted to model-function shapes on $p_t$ whereas A dependence is restricted to particle densities for three hadron species and their antiparticles. A dependence for soft and hard components varying separately as power laws $A^{α_s}$ and $A^{α_h}$ with fixed exponents is a central finding of this study. The trends $A^{α(p_t)}$ inferred by the C-P collaboration resulted from treating spectra as monolithic which confuses the distinct $p_t$ (model functions) and A (particle densities) dependences. The Cronin effect resulting from that confusion is easily explained in a TCM context. Power-law trends for pions at 25 GeV are quantitatively compatible with trends at LHC energies. The relation of exponents $a_s$ and $a_h$ to $p$-A centrality is examined in detail. A Glauber model of $p$-A centrality seems invalid. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_17360 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Analysis of identified-hadron spectra from fixed-target $\bf p$-A collisions and the nature of the Cronin effect Trainor, Thomas A. High Energy Physics - Phenomenology In this study fixed-target spectra obtained by the Chicago-Princeton (C-P) collaboration at Fermilab in the mid seventies are analyzed with a two-component spectrum model (TCM) that has been applied successfully to a number of collision systems at the RHIC and LHC in the past. It is from C-P data that the Cronin effect was first inferred. TCM analysis leads to factorization of collision-energy and target A dependences. Over the energy range of C-P data energy dependence is restricted to model-function shapes on $p_t$ whereas A dependence is restricted to particle densities for three hadron species and their antiparticles. A dependence for soft and hard components varying separately as power laws $A^{α_s}$ and $A^{α_h}$ with fixed exponents is a central finding of this study. The trends $A^{α(p_t)}$ inferred by the C-P collaboration resulted from treating spectra as monolithic which confuses the distinct $p_t$ (model functions) and A (particle densities) dependences. The Cronin effect resulting from that confusion is easily explained in a TCM context. Power-law trends for pions at 25 GeV are quantitatively compatible with trends at LHC energies. The relation of exponents $a_s$ and $a_h$ to $p$-A centrality is examined in detail. A Glauber model of $p$-A centrality seems invalid. |
| title | Analysis of identified-hadron spectra from fixed-target $\bf p$-A collisions and the nature of the Cronin effect |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2410.17360 |