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| Format: | Preprint |
| Published: |
2024
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| Online Access: | https://arxiv.org/abs/2409.12696 |
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| _version_ | 1866913508173545472 |
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| author | Adeva, B. Afanasyev, L. Anania, A. Aogaki, S. Benelli, A. Brekhovskikh, V. Cechak, T. Chiba, M. Chliapnikov, P. Drijard, D. Dudarev, A. Dumitriu, D. Federicova, P. Gorin, A. Gritsay, K. Guaraldo, C. Gugiu, M. Hansroul, M. Hons, Z. Horikawa, S. Iwashita, Y. Kluson, J. Kobayashi, M. Kruglova, L. Kulikov, A. Kulish, E. Lamberto, A. Lanaro, A. Lednicky, R. Marinas, C. Martincik, J. Nemenov, L. Nikitin, M. Okada, K. Olchevskii, V. Pentia, M. Penzo, A. Plo, M. Prusa, P. Rappazzo, G. Vidal, A. Romero Ryazantsev, A. Rykalin, V. Saborido, J. Schacher, J. Sidorov, A. Smolik, J. Takeutchi, F. Trojek, T. Trusov, S. Urban, T. Vrba, T. Yazkov, V. Yoshimura, Y. Zrelov, P. |
| author_facet | Adeva, B. Afanasyev, L. Anania, A. Aogaki, S. Benelli, A. Brekhovskikh, V. Cechak, T. Chiba, M. Chliapnikov, P. Drijard, D. Dudarev, A. Dumitriu, D. Federicova, P. Gorin, A. Gritsay, K. Guaraldo, C. Gugiu, M. Hansroul, M. Hons, Z. Horikawa, S. Iwashita, Y. Kluson, J. Kobayashi, M. Kruglova, L. Kulikov, A. Kulish, E. Lamberto, A. Lanaro, A. Lednicky, R. Marinas, C. Martincik, J. Nemenov, L. Nikitin, M. Okada, K. Olchevskii, V. Pentia, M. Penzo, A. Plo, M. Prusa, P. Rappazzo, G. Vidal, A. Romero Ryazantsev, A. Rykalin, V. Saborido, J. Schacher, J. Sidorov, A. Smolik, J. Takeutchi, F. Trojek, T. Trusov, S. Urban, T. Vrba, T. Yazkov, V. Yoshimura, Y. Zrelov, P. |
| contents | In this work the Coulomb effects (Coulomb correlations) in $π^+π^-$ pairs produced in p + Ni collisions at 24 GeV/$c$, are studied using experimental $π^+π^-$ pair distributions in $Q$, the relative momentum in the pair center of mass system (c.m.s), and its projections $Q_L$ (longitudinal component) and $Q_t$ (transverse component) relative to the pair direction in the laboratory system (l.s.).
The $Q$, $Q_L$, and $Q_t$ distributions of the {\sl Coulomb pairs} in the c.m.s. have been simulated assuming they are described by the phase space modified by the known point-like Coulomb correlation function $A_C(Q)$, corrected for small effects due to the nonpoint-like pair production and the strong two-pion interaction. The same distributions of {\sl non-Coulomb pairs} have been simulated according to the phase space, but without $A_C(Q)$.
It is shown that the number of {\sl Coulomb pairs} in all $Q_t$ intervals, including the small $Q_t$ (small opening angles $θ$ in the l.s.) is calculated with the theoretical precision better than 2\%.
The comparison of the simulated and experimental numbers of {\sl Coulomb pairs} at small $Q_t$ allows us to check and correct the detection efficiency for the pairs with small $θ$ (0.06 mrad and smaller).
It is shown that {\sl Coulomb pairs} can be used as a new physical tool to check and correct the quality of the simulated events. The special property of the {\sl Coulomb pairs} is the possibility of checking and correcting the detection efficiency, especially for the pairs with small opening angles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_12696 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The π^+π^- Coulomb interaction study and its use in the data processing Adeva, B. Afanasyev, L. Anania, A. Aogaki, S. Benelli, A. Brekhovskikh, V. Cechak, T. Chiba, M. Chliapnikov, P. Drijard, D. Dudarev, A. Dumitriu, D. Federicova, P. Gorin, A. Gritsay, K. Guaraldo, C. Gugiu, M. Hansroul, M. Hons, Z. Horikawa, S. Iwashita, Y. Kluson, J. Kobayashi, M. Kruglova, L. Kulikov, A. Kulish, E. Lamberto, A. Lanaro, A. Lednicky, R. Marinas, C. Martincik, J. Nemenov, L. Nikitin, M. Okada, K. Olchevskii, V. Pentia, M. Penzo, A. Plo, M. Prusa, P. Rappazzo, G. Vidal, A. Romero Ryazantsev, A. Rykalin, V. Saborido, J. Schacher, J. Sidorov, A. Smolik, J. Takeutchi, F. Trojek, T. Trusov, S. Urban, T. Vrba, T. Yazkov, V. Yoshimura, Y. Zrelov, P. High Energy Physics - Phenomenology High Energy Physics - Experiment In this work the Coulomb effects (Coulomb correlations) in $π^+π^-$ pairs produced in p + Ni collisions at 24 GeV/$c$, are studied using experimental $π^+π^-$ pair distributions in $Q$, the relative momentum in the pair center of mass system (c.m.s), and its projections $Q_L$ (longitudinal component) and $Q_t$ (transverse component) relative to the pair direction in the laboratory system (l.s.). The $Q$, $Q_L$, and $Q_t$ distributions of the {\sl Coulomb pairs} in the c.m.s. have been simulated assuming they are described by the phase space modified by the known point-like Coulomb correlation function $A_C(Q)$, corrected for small effects due to the nonpoint-like pair production and the strong two-pion interaction. The same distributions of {\sl non-Coulomb pairs} have been simulated according to the phase space, but without $A_C(Q)$. It is shown that the number of {\sl Coulomb pairs} in all $Q_t$ intervals, including the small $Q_t$ (small opening angles $θ$ in the l.s.) is calculated with the theoretical precision better than 2\%. The comparison of the simulated and experimental numbers of {\sl Coulomb pairs} at small $Q_t$ allows us to check and correct the detection efficiency for the pairs with small $θ$ (0.06 mrad and smaller). It is shown that {\sl Coulomb pairs} can be used as a new physical tool to check and correct the quality of the simulated events. The special property of the {\sl Coulomb pairs} is the possibility of checking and correcting the detection efficiency, especially for the pairs with small opening angles. |
| title | The π^+π^- Coulomb interaction study and its use in the data processing |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2409.12696 |