First Measurement of A = 4 Hypernuclei and Antihypernuclei at the LHC

ALICE Collaboration

doi:10.1103/PhysRevLett.134.162301

First Measurement of A = 4 Hypernuclei and Antihypernuclei at the LHC

ALICE Collaboration

Physics Education

Université Clermont Auvergne
Variable Energy Cyclotron Centre India
CERN
National Institute for Nuclear Physics
Aligarh Muslim University
Korea Institute of Science and Technology Information
Pavol Jozef Šafárik University
Goethe University Frankfurt
GSI Helmholtz Centre for Heavy Ion Research
Central China Normal University
Universidad Nacional Autónoma de México
University of Houston
Sungkyunkwan University
University of Bergen
Technical University of Munich
Benemerita Universidad Autonoma de Puebla
Horia Hulubei National Institute of Physics and Nuclear Engineering
University of Derby
University of Münster
Heidelberg University
Lawrence Berkeley National Laboratory
Nantes Université
Université Grenoble Alpes
Universidade de São Paulo
University of Oslo
Yale University

Research output: Contribution to journal › Journal article › peer-review

10 Scopus citations

Abstract

In this Letter, the first evidence of the (Formula presented) antihypernucleus is presented, along with the first measurement at the LHC of the production of (anti)hypernuclei with mass number (Formula presented), specifically (Formula presented) and (Formula presented). In addition, the antiparticle-to-particle ratios for both hypernuclei ((Formula presented) and (Formula presented)) are shown, which are sensitive to the baryochemical potential of the strongly interacting matter created in heavy-ion collisions. The results are obtained from a data sample of central Pb-Pb collisions, collected during the 2018 LHC data taking at a center-of-mass energy per nucleon pair of (Formula presented). The yields measured for the average of the charge-conjugated states are found to be (Formula presented) for the (Formula presented) and (Formula presented) for the (Formula presented), and the measured antiparticle-to-particle ratios are in agreement with unity. The presence of (Formula presented) and (Formula presented) excited states is expected to strongly enhance the production yield of these hypernuclei. The yield values exhibit a combined deviation of (Formula presented) from the theoretical ground-state-only expectation, while the inclusion of the excited states in the calculations leads to an agreement within (Formula presented) with the present measurements. Additionally, the measured (Formula presented) and (Formula presented) masses are compatible with the world-average values within the uncertainties.

Original language	English
Article number	162301
Journal	Physical Review Letters
Volume	134
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.134.162301
State	Published - 2025.04.25

Quacquarelli Symonds(QS) Subject Topics

Physics & Astronomy

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10.1103/PhysRevLett.134.162301

Cite this

@article{541cf51f1c91469e91a476fa4b2f7003,

title = "First Measurement of A = 4 Hypernuclei and Antihypernuclei at the LHC",

abstract = "In this Letter, the first evidence of the (Formula presented) antihypernucleus is presented, along with the first measurement at the LHC of the production of (anti)hypernuclei with mass number (Formula presented), specifically (Formula presented) and (Formula presented). In addition, the antiparticle-to-particle ratios for both hypernuclei ((Formula presented) and (Formula presented)) are shown, which are sensitive to the baryochemical potential of the strongly interacting matter created in heavy-ion collisions. The results are obtained from a data sample of central Pb-Pb collisions, collected during the 2018 LHC data taking at a center-of-mass energy per nucleon pair of (Formula presented). The yields measured for the average of the charge-conjugated states are found to be (Formula presented) for the (Formula presented) and (Formula presented) for the (Formula presented), and the measured antiparticle-to-particle ratios are in agreement with unity. The presence of (Formula presented) and (Formula presented) excited states is expected to strongly enhance the production yield of these hypernuclei. The yield values exhibit a combined deviation of (Formula presented) from the theoretical ground-state-only expectation, while the inclusion of the excited states in the calculations leads to an agreement within (Formula presented) with the present measurements. Additionally, the measured (Formula presented) and (Formula presented) masses are compatible with the world-average values within the uncertainties.",

author = "\{ALICE Collaboration\} and S. Acharya and A. Agarwal and \{Aglieri Rinella\}, G. and L. Aglietta and M. Agnello and N. Agrawal and Z. Ahammed and S. Ahmad and Ahn, \{S. U.\} and I. Ahuja and A. Akindinov and V. Akishina and M. Al-Turany and D. Aleksandrov and B. Alessandro and Alfanda, \{H. M.\} and \{Alfaro Molina\}, R. and B. Ali and A. Alici and N. Alizadehvandchali and A. Alkin and J. Alme and G. Alocco and T. Alt and Altamura, \{A. R.\} and I. Altsybeev and Alvarado, \{J. R.\} and Alvarez, \{C. O.R.\} and Anaam, \{M. N.\} and C. Andrei and N. Andreou and A. Andronic and E. Andronov and V. Anguelov and F. Antinori and P. Antonioli and N. Apadula and L. Aphecetche and H. Appelsh{\"a}user and C. Arata and S. Arcelli and R. Arnaldi and Arneiro, \{J. G.M.C.A.\} and Arsene, \{I. C.\} and M. Arslandok and A. Augustinus and R. Averbeck and D. Averyanov and Azmi, \{M. D.\} and Kim, \{E. J.\}",

note = "Publisher Copyright: {\textcopyright} 2025 CERN, for the ALICE Collaboration.",

year = "2025",

month = apr,

day = "25",

doi = "10.1103/PhysRevLett.134.162301",

language = "English",

volume = "134",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "16",

}

TY - JOUR

T1 - First Measurement of A = 4 Hypernuclei and Antihypernuclei at the LHC

AU - ALICE Collaboration

AU - Acharya, S.

AU - Agarwal, A.

AU - Aglieri Rinella, G.

AU - Aglietta, L.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, S.

AU - Ahn, S. U.

AU - Ahuja, I.

AU - Akindinov, A.

AU - Akishina, V.

AU - Al-Turany, M.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfanda, H. M.

AU - Alfaro Molina, R.

AU - Ali, B.

AU - Alici, A.

AU - Alizadehvandchali, N.

AU - Alkin, A.

AU - Alme, J.

AU - Alocco, G.

AU - Alt, T.

AU - Altamura, A. R.

AU - Altsybeev, I.

AU - Alvarado, J. R.

AU - Alvarez, C. O.R.

AU - Anaam, M. N.

AU - Andrei, C.

AU - Andreou, N.

AU - Andronic, A.

AU - Andronov, E.

AU - Anguelov, V.

AU - Antinori, F.

AU - Antonioli, P.

AU - Apadula, N.

AU - Aphecetche, L.

AU - Appelshäuser, H.

AU - Arata, C.

AU - Arcelli, S.

AU - Arnaldi, R.

AU - Arneiro, J. G.M.C.A.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Averyanov, D.

AU - Azmi, M. D.

AU - Kim, E. J.

PY - 2025/4/25

Y1 - 2025/4/25

N2 - In this Letter, the first evidence of the (Formula presented) antihypernucleus is presented, along with the first measurement at the LHC of the production of (anti)hypernuclei with mass number (Formula presented), specifically (Formula presented) and (Formula presented). In addition, the antiparticle-to-particle ratios for both hypernuclei ((Formula presented) and (Formula presented)) are shown, which are sensitive to the baryochemical potential of the strongly interacting matter created in heavy-ion collisions. The results are obtained from a data sample of central Pb-Pb collisions, collected during the 2018 LHC data taking at a center-of-mass energy per nucleon pair of (Formula presented). The yields measured for the average of the charge-conjugated states are found to be (Formula presented) for the (Formula presented) and (Formula presented) for the (Formula presented), and the measured antiparticle-to-particle ratios are in agreement with unity. The presence of (Formula presented) and (Formula presented) excited states is expected to strongly enhance the production yield of these hypernuclei. The yield values exhibit a combined deviation of (Formula presented) from the theoretical ground-state-only expectation, while the inclusion of the excited states in the calculations leads to an agreement within (Formula presented) with the present measurements. Additionally, the measured (Formula presented) and (Formula presented) masses are compatible with the world-average values within the uncertainties.

AB - In this Letter, the first evidence of the (Formula presented) antihypernucleus is presented, along with the first measurement at the LHC of the production of (anti)hypernuclei with mass number (Formula presented), specifically (Formula presented) and (Formula presented). In addition, the antiparticle-to-particle ratios for both hypernuclei ((Formula presented) and (Formula presented)) are shown, which are sensitive to the baryochemical potential of the strongly interacting matter created in heavy-ion collisions. The results are obtained from a data sample of central Pb-Pb collisions, collected during the 2018 LHC data taking at a center-of-mass energy per nucleon pair of (Formula presented). The yields measured for the average of the charge-conjugated states are found to be (Formula presented) for the (Formula presented) and (Formula presented) for the (Formula presented), and the measured antiparticle-to-particle ratios are in agreement with unity. The presence of (Formula presented) and (Formula presented) excited states is expected to strongly enhance the production yield of these hypernuclei. The yield values exhibit a combined deviation of (Formula presented) from the theoretical ground-state-only expectation, while the inclusion of the excited states in the calculations leads to an agreement within (Formula presented) with the present measurements. Additionally, the measured (Formula presented) and (Formula presented) masses are compatible with the world-average values within the uncertainties.

UR - https://www.scopus.com/pages/publications/105003818892

U2 - 10.1103/PhysRevLett.134.162301

DO - 10.1103/PhysRevLett.134.162301

M3 - Journal article

C2 - 40344112

AN - SCOPUS:105003818892

SN - 0031-9007

VL - 134

JO - Physical Review Letters

JF - Physical Review Letters

IS - 16

M1 - 162301

ER -

First Measurement of A = 4 Hypernuclei and Antihypernuclei at the LHC

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