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Journal articles on the topic 'Hypertriton'

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Author: Grafiati

Published: 11 March 2023

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1

Saito, Takehiko R. "Studies of hypernuclei with heavy-ion beams, nuclear emulsions and machine learning." EPJ Web of Conferences 271 (2022): 08003. http://dx.doi.org/10.1051/epjconf/202227108003.

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The lightest hypernucleus, the hypertriton, has been a benchmark in the field of hypernuclear physics. However, some of recent experiments employing energetic heavy-ion beams have revealed that the hypertriton lifetime is significantly shorter than 263 ps which is expected by considering the known weakly binding nature of the hypertriton. The STAR collaboration has also measured the hypertriton binding energy, and the deduced value is contradicting to its formerly known small binding energy. These measurements have indicated that the fundamental physics quantities of the hypertriton such as its lifetime and binding energy have not been understood, therefore, they have to be measured very precisely. Furthermore, an unprecedented Λnn bound state observed by the HypHI collaboration has to be studied in order to draw a conclusion whether or not such a bound state exists. These three-body hypernuclear states are studied by the heavy-ion beam data in theWASA-FRS experiment and by analysing J-PARC E07 nuclear emulsion data with machine learning.

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2

Ma, Yu-Gang. "(Anti)hypertriton lifetime puzzle." EPJ Web of Conferences 117 (2016): 03003. http://dx.doi.org/10.1051/epjconf/201611703003.

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3

Clare, R. B., and J. S. Levinger. "Hypertriton and hyperspherical harmonics." Physical Review C 31, no. 6 (June 1, 1985): 2303–6. http://dx.doi.org/10.1103/physrevc.31.2303.

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4

Mart, T., D. Kusno, C. Bennhold, L. Tiator, and D. Drechsel. "Photoproduction of the hypertriton." Nuclear Physics A 631 (March 1998): 765–70. http://dx.doi.org/10.1016/s0375-9474(98)00106-7.

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5

Gazda, Daniel, Axel Pérez-Obiol, Avraham Gal, and Eliahu Friedman. "Lifetime of the hypertriton." EPJ Web of Conferences 271 (2022): 01002. http://dx.doi.org/10.1051/epjconf/202227101002.

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Conflicting values of the hypertriton lifetime τ(3ΛH) were derived in relativistic heavy ion (RHI) collision experiments over the last decade. A very recent ALICE Collaboration measurement is the only experiment where the reported τ(3ΛH) comes sufficiently close to the free-Λ lifetime τΛ, as expected naively for a very weakly bound Λ in 3ΛH. We revisited theoretically this 3ΛH lifetime puzzle [1], using 3ΛH and 3He wave functions computed within the ab initio no-core shell model employing interactions derived from chiral effective field theory to calculate the two-body decay rate Γ(3ΛH → 3He + π−). We found significant but opposing contributions arising from ΣNN admixtures in 3ΛH and from π− − 3He final-state interaction. To derive τ(3ΛH), we evaluated the inclusive π− decay rate Γπ− (3ΛH) by using the measured branching ratio Γ(3ΛH → 3He + π−)/Γπ− (3ΛH) and added the π0 contributions through the ΔI = 1/2rule. The resulting τ(3ΛH) varies strongly with the rather poorly known Λ separation energy Esep(3ΛH) and it is thus possible to associate each one of the distinct RHI τ(3ΛH) measurements with its own underlying value of Esep(3ΛH).

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6

ZHANG, SONG, J. H. CHEN, Y. G. MA, Z. B. TANG, and Z. B. XU. "HYPERNUCLEUS PRODUCTION AT RHIC AND HIRFL-CSR ENERGY." International Journal of Modern Physics E 19, no. 08n09 (September 2010): 1829–36. http://dx.doi.org/10.1142/s0218301310016260.

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We calculated the hypertriton production at RHIC-STAR and HIRFL-CSR acceptance, with a multi-phase transport model (AMPT) and a relativistic transport model (ART), respectively. In specific, we calculated the Strangeness Population Factor [Formula: see text] at different beam energy. Our results from AGS to RHIC energy indicated that the collision system may change from hadronic phase at AGS energies to partonic phase at RHIC energies. Our calculation at HIRFL-CSR energy supports the proposal to measure hypertriton at HIRFL-CSR.

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7

Mart, T. "FERMI MOTION AND OFF-SHELL EFFECTS IN ELECTROMAGNETIC PRODUCTION OF THE HYPERTRITON." Modern Physics Letters A 24, no. 11n13 (April 30, 2009): 1039–42. http://dx.doi.org/10.1142/s0217732309000541.

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We present the effects of Fermi motion and different off-shell assumptions on the differential cross sections of photo- and electroproduction of the hypertriton. We found that Fermi motion plays an important role in these processes. Different off-shell assumptions yield different cross section magnitudes. The few available electroproduction data favor the assumption that the initial nucleon is off-shell and the final hyperon is on-shell. Measurement of the hypertriton photoproduction is urgently required to further support our findings.

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8

Akaishi, Takaya, Hidemitsu Asano, Xurong Chen, Alberto Clozza, Catalina Curceanu, Raffaele Del Grande, Carlo Guaraldo, et al. "Comparison of ³_ΛH/⁴_ΛH production cross-section via (K⁻, π⁰) reaction at J-PARC." EPJ Web of Conferences 271 (2022): 01003. http://dx.doi.org/10.1051/epjconf/202227101003.

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Recent heavy-ion collision experiments reported a surprisingly short lifetime for the hypertriton, which has been recognized as the hypertriton lifetime puzzle. Our J-PARC E73 experiment contributes to solve this puzzle with an independent experimental method by employing 3He(K−, π0) 3ΛH reaction. In this contribution, we will demonstrate our capability to provide 3ΛH binding energy information by deriving the production cross section ratio, σ3ΛH/σ4ΛH. The production cross section data for 3ΛH and 4ΛH are already available as the pilot run of E73 experiment and data analysis is in progress.

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9

Glöckle, W., K. Miyagawa, H. Kamada, J. Golak, and H. Witala. "The hypertriton and its decays." Nuclear Physics A 639, no. 1-2 (August 1998): 297c—306c. http://dx.doi.org/10.1016/s0375-9474(98)00287-5.

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10

Mart, T., L. Tiator, D. Drechsel, and C. Bennhold. "Electromagnetic production of the hypertriton." Nuclear Physics A 640, no. 2 (September 1998): 235–58. http://dx.doi.org/10.1016/s0375-9474(98)00441-2.

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11

Gårdestig, Anders. "Threshold production of the hypertriton." Zeitschrift für Physik A Hadrons and Nuclei 357, no. 1 (March 1997): 101–5. http://dx.doi.org/10.1007/s002180050220.

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12

Pérez-Obiol, A., D. Gazda, E. Friedman, and A. Gal. "Revisiting the hypertriton lifetime puzzle." Physics Letters B 811 (December 2020): 135916. http://dx.doi.org/10.1016/j.physletb.2020.135916.

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13

Nakagawa, Manami, Ayumi Kasagi, Enqiang Liu, Hiroyuki Ekawa, Junya Yoshida, Wenbo Dou, Yan He, et al. "Unique approach for precise determination of binding energies of hypernuclei with nuclear emulsion and machine learning." EPJ Web of Conferences 271 (2022): 11006. http://dx.doi.org/10.1051/epjconf/202227111006.

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Hypertriton is the lightest hypernucleus and a benchmark in hypernuclear physics. However, it has recently been suggested that its lifetime and binding energy values may differ from the established values. To solve this puzzle, it is necessary to measure both values with a higher precision. For the precise measurement of the binding energy, we are aiming at developing a novel technique to measure the hypertriton binding energy with unprecedented accuracy by combining nuclear emulsion data and machine learning techniques. The analysis will be based on the J-PARC E07 nuclear emulsion data. Furthermore, a machine-learning model is being developed to identify other single and double-strangeness hypernuclei.

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14

Bennhold, C., A. Ramos, D. A. Aruliah, and U. Oelfke. "Nonmesonic weak decay of the hypertriton." Physical Review C 45, no. 3 (March 1, 1992): 947–51. http://dx.doi.org/10.1103/physrevc.45.947.

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15

Golak, J., K. Miyagawa, H. Kamada, H. Witała, W. Glöckle, A. Parreño, A. Ramos, and C. Bennhold. "Nonmesonic weak decay of the hypertriton." Physical Review C 55, no. 5 (May 1, 1997): 2196–213. http://dx.doi.org/10.1103/physrevc.55.2196.

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16

Kamada, H., J. Golak, K. Miyagawa, H. Witała, and W. Glöckle. "π-mesonic decay of the hypertriton." Physical Review C 57, no. 4 (April 1, 1998): 1595–603. http://dx.doi.org/10.1103/physrevc.57.1595.

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17

Gongleton, J. G. "A simple model of the hypertriton." Journal of Physics G: Nuclear and Particle Physics 18, no. 2 (February 1, 1992): 339–57. http://dx.doi.org/10.1088/0954-3899/18/2/015.

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18

Hammer, H. W. "The hypertriton in effective field theory." Nuclear Physics A 705, no. 1-2 (July 2002): 173–89. http://dx.doi.org/10.1016/s0375-9474(02)00621-8.

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19

Nag, J. "The magnetic moment of the hypertriton." Physics Letters B 164, no. 4-6 (December 1985): 228–30. http://dx.doi.org/10.1016/0370-2693(85)90314-4.

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20

KHARCHENKO, V. F., and A. V. KHARCHENKO. "ELECTRIC DIPOLE POLARIZABILITIES OF THE TRITON AND LAMBDA HYPERTRITON." International Journal of Modern Physics E 19, no. 02 (February 2010): 225–42. http://dx.doi.org/10.1142/s0218301310014625.

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A rigorous formalism for determining the electric dipole polarizability of a three-hadron bound complex in the case that the system has only one bound (ground) state has been elaborated. On its basis, by applying a model wave function that takes into account specific features of the structure of the three-body nuclei and using the known low-energy experimental data for the p–n, n–d, and Λ–d systems as input data, we have calculated the values of the electric dipole polarizabilities of the triton αE(3 H ) and lambda hypertriton [Formula: see text]. We have obtained for the triton polarizability the value 0.23 fm3. It follows from our study that the polarizability of the lambda hypertriton is close to 3 fm3 exceeding the polarizabilities of the ordinary three-nucleon nuclei by an order of magnitude.

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21

Afnan, I. R., and B. F. Gibson. "Hypertriton: Λ⇆Σ conversion and tensor forces." Physical Review C 41, no. 6 (June 1, 1990): 2787–99. http://dx.doi.org/10.1103/physrevc.41.2787.

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22

Afnan, I. R., and B. F. Gibson. "Resonances in Λdscattering and the Σ hypertriton." Physical Review C 47, no. 3 (March 1, 1993): 1000–1012. http://dx.doi.org/10.1103/physrevc.47.1000.

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23

Golak, J., K. Miyagawa, H. Kamada, H. Witała, W. Glöckle, A. Parreño, A. Ramos, and C. Bennhold. "The nonmesonic weak decay of the hypertriton." Nuclear Physics A 631 (March 1998): 740–44. http://dx.doi.org/10.1016/s0375-9474(98)00102-x.

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24

Zhang, Zhen, and Che Ming Ko. "Hypertriton production in relativistic heavy ion collisions." Physics Letters B 780 (May 2018): 191–95. http://dx.doi.org/10.1016/j.physletb.2018.03.003.

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25

Trogolo, Stefano. "(Anti-)(hyper-)nuclei production in Pb–Pb collisions with ALICE at the Large Hadron Collider." Journal of Physics: Conference Series 1643, no. 1 (December 1, 2020): 012017. http://dx.doi.org/10.1088/1742-6596/1643/1/012017.

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Abstract In ultra-relativistic heavy-ion collisions a great variety of (anti-)(hyper-)nuclei are produced, namely deuteron, triton, 3He, 4He, hypertriton ( Λ 3 H ) and their antiparticles. The ALICE experiment is the most suited to investigate the production of (hyper-)nuclei at the LHC, thanks to an excellent particle identification and low-material budget detectors. Recent results on (hyper-)nuclei production as a function of transverse momentum (pT) and charged particle multiplicity (dN ch/d η ) in Pb–Pb collisions are presented. The evolution of the production yields with the system size is also shown, via comparison to the results obtained in small collision systems, like pp and p–Pb. The results on the production of (hyper-)nuclei are also compared with the predictions based on a naive coalescence approach and the statistical hadronization models. Furthermore, the latest and currently most precise measurement of the hypertriton lifetime is presented. It is compared with results obtained by different experimental techniques and with theoretical predictions.

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26

Miyagawa, K., and W. Glöckle. "Hypertriton calculations with meson-theoretical hyperon-nucleon interactions." Nuclear Physics A 585, no. 1-2 (March 1995): 169–72. http://dx.doi.org/10.1016/0375-9474(94)00561-z.

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27

Barioglio, Luca. "Anti- and Hyper-Nuclei Production at the LHC with ALICE." Proceedings 10, no. 1 (May 7, 2019): 47. http://dx.doi.org/10.3390/proceedings2019010047.

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At the Large Hadron Collider (LHC) a significant production of (anti-)(hyper-)nuclei is observed in proton-proton (pp), proton-lead (p-Pb) and lead-lead (Pb-Pb) collisions. The measurement of the production yields of light (anti-)nuclei is extremely important to provide insight into the production mechanisms of nuclear matter, which is still an open question in high energy physics. The outstanding particle identification (PID) capabilities of the ALICE detectors allow the identification of rarely produced particles such as deuterons, 3 He and their antiparticles. From the production spectra measured for light (anti-)nuclei with ALICE, the key observables of the production mechanisms (antimatter/matter ratio, coalescence parameter, nuclei/protons ratio) are computed and compared with the available theoretical models. Another open question is the determination of the hypertriton lifetime: published experimental values show a lifetime shorter than the expected one, which should be close to that of the free Λ hyperon. Thanks to the high-resolution track reconstruction capabilities of the ALICE experiment, it has been possible to determine the hypertriton lifetime at the highest Pb-Pb collisions energy with the highest precision ever reached.

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28

Gal, Avraham. "Recent progress on few-body hypernuclei." EPJ Web of Conferences 259 (2022): 08002. http://dx.doi.org/10.1051/epjconf/202225908002.

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Few-body Λ hypernuclei provide valuable information towards understanding strange matter. Recent experimental progress by the STAR Collaboration at the RHIC facility and by the ALICE Collaboration at the LHC has been matched by theoretical progress reviewed here: (i) lifetimes of the hypertriton Λ3H, Λ3n if particle-stable, Λ4H and Λ4He and their charge symmetry breaking, and (ii) the onset of ΛΛ hypernuclear binding.

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29

Wei-quan, Chen, and Chu Lian-yuan. "The Study of Hypertriton with Three-Body Integral Equation." Communications in Theoretical Physics 8, no. 3 (October 1987): 317–24. http://dx.doi.org/10.1088/0253-6102/8/3/317.

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30

Mazzaschi, F. "Measurement of the Hypertriton Properties and Production with ALICE." Acta Physica Polonica B Proceedings Supplement 16, no. 1 (2023): 1. http://dx.doi.org/10.5506/aphyspolbsupp.16.1-a149.

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31

Eckert, Philipp, Patrick Achenbach, Takeru Akiyama, Jinhui Chen, Michael O. Distler, Anselm Esser, Julian Geratz, et al. "Commissioning of the hypertriton binding energy measurement at MAMI." EPJ Web of Conferences 271 (2022): 01006. http://dx.doi.org/10.1051/epjconf/202227101006.

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A high-precision hypernuclear experiment has been commissioned at the Mainz Microtron (MAMI) to determine the hypertriton Λ binding energy via decay-pion spectroscopy. The method has been successfully pioneered with 4ΛH studies in the last decade. The experiment makes use of a novel high luminosity lithium target with a length of 45mm while being only 0.75mm thick to keep momentum smearing of the decay pions low. The target-to-beam alignment as well as the observation of the deposited heat is achieved with a newly developed thermal imaging system. Together with a precise beam energy determination via the undulator light interference method a recalibration of the magnetic spectrometers will be done to obtain a statistical and systematic error of about 20 keV. The experiment started in the summer of 2022 and initial optimization studies for luminosity and data quality are presented.

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32

Allam, M. A. "Quark Model Three Body Calculations for the Hypertriton Bound State." IOSR Journal of Applied Physics 4, no. 1 (2013): 14–20. http://dx.doi.org/10.9790/4861-0411420.

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33

Trogolo, Stefano. "Addressing the hypertriton lifetime puzzle with ALICE at the LHC." Nuclear Physics A 982 (February 2019): 815–18. http://dx.doi.org/10.1016/j.nuclphysa.2018.11.016.

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34

Le, Hoai, Johann Haidenbauer, Ulf-G. Meißner, and Andreas Nogga. "Implications of an increased Λ-separation energy of the hypertriton." Physics Letters B 801 (February 2020): 135189. http://dx.doi.org/10.1016/j.physletb.2019.135189.

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35

Ma, Yu-Gang. "Detecting the anti-hypertriton and anti-helium-4 from the RHIC." EPJ Web of Conferences 66 (2014): 04020. http://dx.doi.org/10.1051/epjconf/20146604020.

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36

Miyagawa, K., and W. Glöckle. "Hypertriton calculation with meson-theoretical nucleon-nucleon and hyperon-nucleon interactions." Physical Review C 48, no. 6 (December 1, 1993): 2576–84. http://dx.doi.org/10.1103/physrevc.48.2576.

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37

Pérez-Obiol, Axel, David R. Entem, and Andreas Nogga. "Λ N → NN EFT potentials and hypertriton non-mesonic weak decay." Journal of Physics: Conference Series 1024 (May 2018): 012033. http://dx.doi.org/10.1088/1742-6596/1024/1/012033.

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38

Golak, J., K. Miyagawa, H. Kamada, H. Witała, W. Glöckle, A. Parreño, A. Ramos, and C. Bennhold. "Erratum: Nonmesonic weak decay of the hypertriton [Phys. Rev. C55, 2196 (1997)]." Physical Review C 56, no. 5 (November 1, 1997): 2892. http://dx.doi.org/10.1103/physrevc.56.2892.

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39

Tominaga, K., and T. Ueda. "Effective one-boson-exchange potential for N and N systems and hypertriton." Nuclear Physics A 693, no. 3-4 (October 2001): 731–54. http://dx.doi.org/10.1016/s0375-9474(01)00882-x.

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40

Zhu, Yuhui. "Beam Energy Scan on Hypertriton Production and Lifetime Measurement at RHIC STAR." Nuclear Physics A 904-905 (May 2013): 551c—554c. http://dx.doi.org/10.1016/j.nuclphysa.2013.02.074.

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41

Meoto, E. F., and M. L. Lekala. "Faddeev calculations on lambda hypertriton with potentials from Gel’fand–Levitan–Marchenko theory." Communications in Theoretical Physics 72, no. 10 (September 29, 2020): 105302. http://dx.doi.org/10.1088/1572-9494/aba25a.

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42

Fedorov, D. V., and A. S. Jensen. "Regularized zero-range model and an application to the triton and the hypertriton." Nuclear Physics A 697, no. 3-4 (January 2002): 783–801. http://dx.doi.org/10.1016/s0375-9474(01)01266-0.

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43

Fujiwara, Y., K. Miyagawa, M. Kohno, and Y. Suzuki. "Faddeev calculation of the hypertriton in the quark-model NN and YN interactions." Nuclear Physics A 738 (June 2004): 382–86. http://dx.doi.org/10.1016/j.nuclphysa.2004.04.066.

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44

Mart, T. "Electromagnetic Productions of the Hyperon and the Hypertriton Using Real and Virtual Photons." EPJ Web of Conferences 3 (2010): 07002. http://dx.doi.org/10.1051/epjconf/20100307002.

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45

Somparn, Natthapon, Sukanya Sombun, Ayut Limphirat, Chinorat Kobdaj, and Yupeng Yan. "Simulation of hypertriton productions in Pb-Pb collisions at ALICE energies using PACIAE model." Journal of Physics: Conference Series 1719, no. 1 (January 1, 2021): 012040. http://dx.doi.org/10.1088/1742-6596/1719/1/012040.

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46

Zhang, Song, Jin-Hui Chen, Yu-Gang Ma, Zhang-Bu Xu, Xiang-Zhou Cai, Guo-Liang Ma, and Chen Zhong. "Hypertriton and light nuclei production at Λ-production subthreshold energy in heavy-ion collisions." Chinese Physics C 35, no. 8 (August 2011): 741–46. http://dx.doi.org/10.1088/1674-1137/35/8/008.

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47

Ekawa, Hiroyuki. "WASA-FRS HypHI experiment at GSI for studying light hypernuclei." EPJ Web of Conferences 271 (2022): 08012. http://dx.doi.org/10.1051/epjconf/202227108012.

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From January till March 2022, the WASA-FRS HypHI experiment performed a precise measurement of the hypertriton and the 4ΛH hypernucleus lifetime at GSI. The data collected should also confirm whether or not the nnΛ bound state can exist. The experiment were carried out with the WASA central detector with a complex of additional dedicated detectors mounted together at the mid-focal plane of the high-momentum-resolution forward spectrometer, the so-called fragment separator FRS. Hypernuclei of interest were produced by induced reactions of 6Li projectiles at 1.96 A GeV on a diamond target with a thickness of 9.87 g/cm2. Negatively charged π mesons from two-body decays of the hypernuclei of interest were measured by theWASA and the other detectors, and the residual nuclei after the π− decay were measured by the FRS with a momentum resolving power of 104.

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48

Nakamura, Satoshi N. "Future prospects of spectroscopic study of Lambda hypernuclei at JLab and J-PARC HIHR." EPJ Web of Conferences 271 (2022): 11003. http://dx.doi.org/10.1051/epjconf/202227111003.

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The (e, e′K+) reaction spectroscopy opened a door to high resolution spectroscopy of Λ hypernuclei at JLab and it is currently the only technique to give sub-MeV energy resolution for reaction spectroscopy of wide-mass range Λ hypernuclei. New experiments from light to heavy hypernuclei are under preparation at JLab to solve hypertriton puzzle, to clarify charge symmetry breaking of Λ hypernuclei and to give a clue to solve the hyperon puzzle or the puzzle of heavy neutron stars. As a hypernuclear precision spectroscopy experiment with other than electron beams, there is a newly proposed experiment using the (π+, K+) reaction at the new HIHR beamline, which is a key facility in the J-PARC hadron experimental facility extension project. The HIHR beamline adopts the momentum dispersion match technique and will enable us to perform sub-MeV resolution spectroscopy for isospin partners to the Λ hypernuclei studied with the electron beams at JLab.

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49

Ando, Shung-Ichi. "Hypernuclei in halo/cluster effective field theory." International Journal of Modern Physics E 25, no. 05 (May 2016): 1641005. http://dx.doi.org/10.1142/s0218301316410056.

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The light double [Formula: see text] hypernuclei, [Formula: see text] and [Formula: see text], are studied as three-body [Formula: see text] and [Formula: see text] cluster systems in halo/cluster effective field theory at leading order. We find that the [Formula: see text] system in spin-0 channel does not exhibit a limit cycle whereas the [Formula: see text] system in spin-1 channel and the [Formula: see text] system in spin-0 channel do. The limit cycle is associated with the formation of bound states, known as Efimov states, in the unitary limit. For the [Formula: see text] system in the spin-0 channel we estimate the scattering length [Formula: see text] for [Formula: see text]-wave [Formula: see text] hyperon–hypertriton scattering as [Formula: see text][Formula: see text]fm. We also discuss that studying the cutoff dependences in the [Formula: see text] and [Formula: see text] systems, the bound state of [Formula: see text] is not an Efimov state but formed due to a high energy mechanism whereas that of [Formula: see text] may be regarded as an Efimov state.

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50

Bartsch, Esther. "New results of light (anti-)(hyper-)nuclei production and hypertriton lifetime in Pb–Pb collisions at the LHC." Nuclear Physics A 1005 (January 2021): 121791. http://dx.doi.org/10.1016/j.nuclphysa.2020.121791.

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