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Formation and lifetime measurements of light hypernuclei in Ag+Ag collisions at $\mathrm{\sqrt{s_{NN}}}$ = 2.55 GeV

Fuente: arXiv

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Autori principali:	Yassine, R. Abou, Adamczewski-Musch, J., Asal, C., Becker, M., Belounnas, A., Blanco, A., Blume, C., Chlad, L., Chudoba, P., Ciepał, I., Dreyer, J., Esmail, W. A., Fabbietti, L., Floersheimer, H., Förtsch, J., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Greifenhagen, R., Grunwald, M., Gumberidze, M., Harabasz, S., Heinz, T., Höhne, C., Hojeij, F., Holzmann, R., Huck, H., Idzik, M., Kämpfer, B., Kampert, K-H., Kardan, B., Kedych, V., Kim, S., Koenig, I., Koenig, W., Kohls, M., Kolas, J., Kornakov, G., Kotte, R., Kres, I., Krueger, W., Kugler, A., Lalik, R., Lebedev, S., Linev, S., Linz, F., Lopes, L., Lorenz, M., Malige, A., Markert, J., Matulewicz, T., Maurus, S., Metag, V., Michel, J., Molenda, A., Müntz, C., Nabroth, M., Naumann, L., Nowakowski, K., Opíchal, A., Orliński, J., Otto, J. -H., Parschau, M., Pauly, C., Pawlowska-Szymanska, D., Pechenov, V., Pechenova, O., Pfeifer, D., Piasecki, K., Pietraszko, J., Povar, T., Prościński, K., Prozorov, A., Przygoda, W., Pysz, K., Ramstein, B., Rathod, N., Ritman, J., Rost, A., Rustamov, A., Salabura, P., Saraiva, J., Scharmann, K., Schild, N., Schwab, E., Scozzi, F., Seck, F., Selyuzhenkov, I., Singh, U., Skorpil, L., Smyrski, J., Spies, S., Sreejith, A., Ströbele, H., Stroth, J., Sumara, K., Svoboda, O., Szala, M., Tlusty, P., Traxler, M., Treliński, S., Udrea, I. C., Ulrich-Pur, F., Ungethum, C., Wagner, V., Weber, A. A., Wendisch, C., Wirth, J., Władyszewska, A., Zbroszczyk, H. P., Zherebtsova, E., Zieliński, M., Zumbruch, P.
Natura:	Preprint
Pubblicazione:	2025
Soggetti:	Nuclear Experiment High Energy Physics - Experiment
Accesso online:	Acceder al recurso
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author	Yassine, R. Abou Adamczewski-Musch, J. Asal, C. Becker, M. Belounnas, A. Blanco, A. Blume, C. Chlad, L. Chudoba, P. Ciepał, I. Dreyer, J. Esmail, W. A. Fabbietti, L. Floersheimer, H. Förtsch, J. Fonte, P. Friese, J. Fröhlich, I. Galatyuk, T. Greifenhagen, R. Grunwald, M. Gumberidze, M. Harabasz, S. Heinz, T. Höhne, C. Hojeij, F. Holzmann, R. Huck, H. Idzik, M. Kämpfer, B. Kampert, K-H. Kardan, B. Kedych, V. Kim, S. Koenig, I. Koenig, W. Kohls, M. Kolas, J. Kornakov, G. Kotte, R. Kres, I. Krueger, W. Kugler, A. Lalik, R. Lebedev, S. Linev, S. Linz, F. Lopes, L. Lorenz, M. Malige, A. Markert, J. Matulewicz, T. Maurus, S. Metag, V. Michel, J. Molenda, A. Müntz, C. Nabroth, M. Naumann, L. Nowakowski, K. Opíchal, A. Orliński, J. Otto, J. -H. Parschau, M. Pauly, C. Pawlowska-Szymanska, D. Pechenov, V. Pechenova, O. Pfeifer, D. Piasecki, K. Pietraszko, J. Povar, T. Prościński, K. Prozorov, A. Przygoda, W. Pysz, K. Ramstein, B. Rathod, N. Ritman, J. Rost, A. Rustamov, A. Salabura, P. Saraiva, J. Scharmann, K. Schild, N. Schwab, E. Scozzi, F. Seck, F. Selyuzhenkov, I. Singh, U. Skorpil, L. Smyrski, J. Spies, S. Sreejith, A. Ströbele, H. Stroth, J. Sumara, K. Svoboda, O. Szala, M. Tlusty, P. Traxler, M. Treliński, S. Udrea, I. C. Ulrich-Pur, F. Ungethum, C. Wagner, V. Weber, A. A. Wendisch, C. Wirth, J. Władyszewska, A. Zbroszczyk, H. P. Zherebtsova, E. Zieliński, M. Zumbruch, P.
author_facet	Yassine, R. Abou Adamczewski-Musch, J. Asal, C. Becker, M. Belounnas, A. Blanco, A. Blume, C. Chlad, L. Chudoba, P. Ciepał, I. Dreyer, J. Esmail, W. A. Fabbietti, L. Floersheimer, H. Förtsch, J. Fonte, P. Friese, J. Fröhlich, I. Galatyuk, T. Greifenhagen, R. Grunwald, M. Gumberidze, M. Harabasz, S. Heinz, T. Höhne, C. Hojeij, F. Holzmann, R. Huck, H. Idzik, M. Kämpfer, B. Kampert, K-H. Kardan, B. Kedych, V. Kim, S. Koenig, I. Koenig, W. Kohls, M. Kolas, J. Kornakov, G. Kotte, R. Kres, I. Krueger, W. Kugler, A. Lalik, R. Lebedev, S. Linev, S. Linz, F. Lopes, L. Lorenz, M. Malige, A. Markert, J. Matulewicz, T. Maurus, S. Metag, V. Michel, J. Molenda, A. Müntz, C. Nabroth, M. Naumann, L. Nowakowski, K. Opíchal, A. Orliński, J. Otto, J. -H. Parschau, M. Pauly, C. Pawlowska-Szymanska, D. Pechenov, V. Pechenova, O. Pfeifer, D. Piasecki, K. Pietraszko, J. Povar, T. Prościński, K. Prozorov, A. Przygoda, W. Pysz, K. Ramstein, B. Rathod, N. Ritman, J. Rost, A. Rustamov, A. Salabura, P. Saraiva, J. Scharmann, K. Schild, N. Schwab, E. Scozzi, F. Seck, F. Selyuzhenkov, I. Singh, U. Skorpil, L. Smyrski, J. Spies, S. Sreejith, A. Ströbele, H. Stroth, J. Sumara, K. Svoboda, O. Szala, M. Tlusty, P. Traxler, M. Treliński, S. Udrea, I. C. Ulrich-Pur, F. Ungethum, C. Wagner, V. Weber, A. A. Wendisch, C. Wirth, J. Władyszewska, A. Zbroszczyk, H. P. Zherebtsova, E. Zieliński, M. Zumbruch, P.
contents	We present the first observation of $\mathrm{^{3}_ΛH}$ and $\mathrm{^{4}_ΛH}$ in Ag+Ag collisions at $\mathrm{\sqrt{s_{NN}}}$ = 2.55 GeV, emitted around mid-rapidity. The hypernuclei are reconstructed via their two-body decay channels and identified through their weak-decay topology, employing an artificial neural network for enhanced discrimination. The analysis methodology is validated using $Λ$ hyperons. The resulting rapidity distributions, dN/dy, exhibit a bell shape centered at mid-rapidity. The yield of $\mathrm{^{4}_ΛH}$ is equal to or exceeds that of $\mathrm{^{3}_ΛH}$, which contrasts the measurement from the STAR collaboration at $\mathrm{\sqrt{s_{NN}}}$ = 3 GeV and is consistent with a scenario in which hypernuclei receive feed-down from excited states. The data enable a high-precision measurement of the hypernuclei lifetimes. For the $\mathrm{^{3}_ΛH}$, a lifetime of $\mathrm{τ_{^{3}_ΛH}}$ = $(239 \pm 23{\mathrm{(stat)}} \pm 18{\mathrm{(sys)}})\,\mathrm{ps}$, is extracted, consistent on the 1$σ$ level with that of the free $Λ$. In contrast, the $\mathrm{^{4}_ΛH}$ lifetime of $\mathrm{τ_{^{4}_ΛH}}$ = $(209 \pm 7{\mathrm{(stat)}} \pm 10{\mathrm{(sys)}})\,\mathrm{ps}$, shows a 4.5 $σ$ deviation from the free $Λ$ lifetime. The results consolidate the available world data.
format	Preprint
id	arxiv_https___arxiv_org_abs_2512_12454
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Formation and lifetime measurements of light hypernuclei in Ag+Ag collisions at $\mathrm{\sqrt{s_{NN}}}$ = 2.55 GeV Yassine, R. Abou Adamczewski-Musch, J. Asal, C. Becker, M. Belounnas, A. Blanco, A. Blume, C. Chlad, L. Chudoba, P. Ciepał, I. Dreyer, J. Esmail, W. A. Fabbietti, L. Floersheimer, H. Förtsch, J. Fonte, P. Friese, J. Fröhlich, I. Galatyuk, T. Greifenhagen, R. Grunwald, M. Gumberidze, M. Harabasz, S. Heinz, T. Höhne, C. Hojeij, F. Holzmann, R. Huck, H. Idzik, M. Kämpfer, B. Kampert, K-H. Kardan, B. Kedych, V. Kim, S. Koenig, I. Koenig, W. Kohls, M. Kolas, J. Kornakov, G. Kotte, R. Kres, I. Krueger, W. Kugler, A. Lalik, R. Lebedev, S. Linev, S. Linz, F. Lopes, L. Lorenz, M. Malige, A. Markert, J. Matulewicz, T. Maurus, S. Metag, V. Michel, J. Molenda, A. Müntz, C. Nabroth, M. Naumann, L. Nowakowski, K. Opíchal, A. Orliński, J. Otto, J. -H. Parschau, M. Pauly, C. Pawlowska-Szymanska, D. Pechenov, V. Pechenova, O. Pfeifer, D. Piasecki, K. Pietraszko, J. Povar, T. Prościński, K. Prozorov, A. Przygoda, W. Pysz, K. Ramstein, B. Rathod, N. Ritman, J. Rost, A. Rustamov, A. Salabura, P. Saraiva, J. Scharmann, K. Schild, N. Schwab, E. Scozzi, F. Seck, F. Selyuzhenkov, I. Singh, U. Skorpil, L. Smyrski, J. Spies, S. Sreejith, A. Ströbele, H. Stroth, J. Sumara, K. Svoboda, O. Szala, M. Tlusty, P. Traxler, M. Treliński, S. Udrea, I. C. Ulrich-Pur, F. Ungethum, C. Wagner, V. Weber, A. A. Wendisch, C. Wirth, J. Władyszewska, A. Zbroszczyk, H. P. Zherebtsova, E. Zieliński, M. Zumbruch, P. Nuclear Experiment High Energy Physics - Experiment We present the first observation of $\mathrm{^{3}_ΛH}$ and $\mathrm{^{4}_ΛH}$ in Ag+Ag collisions at $\mathrm{\sqrt{s_{NN}}}$ = 2.55 GeV, emitted around mid-rapidity. The hypernuclei are reconstructed via their two-body decay channels and identified through their weak-decay topology, employing an artificial neural network for enhanced discrimination. The analysis methodology is validated using $Λ$ hyperons. The resulting rapidity distributions, dN/dy, exhibit a bell shape centered at mid-rapidity. The yield of $\mathrm{^{4}_ΛH}$ is equal to or exceeds that of $\mathrm{^{3}_ΛH}$, which contrasts the measurement from the STAR collaboration at $\mathrm{\sqrt{s_{NN}}}$ = 3 GeV and is consistent with a scenario in which hypernuclei receive feed-down from excited states. The data enable a high-precision measurement of the hypernuclei lifetimes. For the $\mathrm{^{3}_ΛH}$, a lifetime of $\mathrm{τ_{^{3}_ΛH}}$ = $(239 \pm 23{\mathrm{(stat)}} \pm 18{\mathrm{(sys)}})\,\mathrm{ps}$, is extracted, consistent on the 1$σ$ level with that of the free $Λ$. In contrast, the $\mathrm{^{4}_ΛH}$ lifetime of $\mathrm{τ_{^{4}_ΛH}}$ = $(209 \pm 7{\mathrm{(stat)}} \pm 10{\mathrm{(sys)}})\,\mathrm{ps}$, shows a 4.5 $σ$ deviation from the free $Λ$ lifetime. The results consolidate the available world data.
title	Formation and lifetime measurements of light hypernuclei in Ag+Ag collisions at $\mathrm{\sqrt{s_{NN}}}$ = 2.55 GeV
topic	Nuclear Experiment High Energy Physics - Experiment
url	https://arxiv.org/abs/2512.12454