Search for weakly decaying Λn‾ and ΛΛ exotic bound states in central Pb–Pb collisions at √sNN=2.76 TeV

ALICE Collaboration

doi:10.1016/j.physletb.2015.11.048

Search for weakly decaying Λn‾ and ΛΛ exotic bound states in central Pb–Pb collisions at √s_NN=2.76 TeV

ALICE Collaboration

Chair of Experimentalphysik - Dense and Strange Hadronic Matter

Czech Technical University in Prague
Nuclear Physics Institute of the Cas
Panjab University
European Organization for Nuclear Research
INFN Sez. di Torino
The Indian Institute of Technology Bombay
VECC Kolkata
COMSATS University Islamabad
Korea Institute of Science and Technology Information
Politecnico di Torino
Yale University
ITEP
National Research Centre "Kurchatov Institute"
University of Birmingham
Universidad Nacional Autónoma de México
Centro Fermi
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
Bogolyubov Institute for Theoretical Physics Nasu
Bergen University College
Frankfurt Institute for Advanced Studies
University of Bergen
University of St. Petersburg
University of São Paulo
Horia Hulubei National Institute of Physics and Nuclear Engineering
GSI Helmholtz Center
Heidelberg University
University of Münster
Rudjer Boskovic Institute
Dipartimento di Fisica 'G. Galilei' and INFN
l'institut du thorax
Johann Wolfgang Goethe University
DIBINEM, Alma Mater Studiorum, University of Bologna
Universidad de Santiago de Compostela
University of Oslo
Aligarh Muslim University
Laboratori Nazionali Del Sud
Gangneung-Wonju National University
University of Jammu
Commissariat A l'Énergie Atomique et Aux Énergies Alternatives, Centre de Saclay, IRFU
Technical University of Munich
Institute of Physics Bhubaneswar
Università di Catania
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
Hungarian Academy of Sciences
LAIC, Université d'Auvergne
Central China Normal University
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences
Joint Inst. for Nuclear Research
Niels Bohr Institutet
Indian Institute of Technology Indore
Universite de Strasbourg
Benemerita Universidad Autonoma de Puebla
University of Houston
Wayne State University
National Research Nuclear University MEPhI
Petersburg Nuclear Phys. Inst.
the University of Utrecht
Gauhati University
Tsukuba University
INFN, Laboratori Nazionali Di Frascati
National Institute of Science Education and Research
CIEMAT Energy Department
Lawrence Berkeley National Laboratory
P. J. Safarik University
Pusan National University
STFC Daresbury Laboratory
National Research Foundation
Science Park 105
Purdue University
University of Helsinki and Helsinki Institute of Physics
Russian Federal Nuclear Center (VNIIEF)
Ohio State University
Pontifical Catholic University of Peru San Miguel
INFN- Sezione di Trieste
University of Tennessee
University of Cagliari
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear
University of Jyväskylä
University of Liverpool
Saha Institute of Nuclear Physics
Creighton University
Université Claude Bernard Lyon 1
University of Campinas
Lund University
Sezione INFN di Cagliari
University of Cape Town
University of Grenoble Alpes
University Paris-Sud
CINVESTAV
Oak Ridge National Laboratory
Sezione INFN di Roma La Sapienza
Instituto de Ciencias Nucleares de la UNAM
Institute of Space Sciences
Bose Institute
National Center for Nuclear Research (NCBJ)
University of Zagreb
Institute for High Energy Physics (IHEP)
Institute for Nuclear Research of the Russian Academy of Sciences
University of Athens
Chicago State University
University of Split
Warsaw Institute of Technology
A.I. Alikhanyan National Science Laboratory (YerPhi)
University of Tokyo
University of Tübingen
Sejong University
Institute of Experimental Physics Slovak Academy of Sciences
Yonsei University
KTO Karatay University
Fachhochschule Worms
California Polytechnic State University, San Luis Obispo
University of Texas at Austin
Suranaree University of Technology
Inha University
University of South-Eastern Norway
Universidad Autonoma de Sinaloa
China Institute of Atomic Energy
Institute of Physics of the Czech Academy of Sciences
Dipartimento di Fisica
Comenius University
Laboratory for Thermal Engineering and Energy
Politecnico di Bari
Konkuk University
Hiroshima University
Budker Institute of Nuclear Physics (SB RAS)
University of Rajasthan
Laboratori Nazionali di Legnaro
Lawrence Livermore National Laboratory
University of Kansas
CNRS/IN2P3 and Université Paris 11
University of the Witwatersrand, Johannesburg

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible Λn‾ bound state. The search is performed with the ALICE detector in central (0–10%) Pb–Pb collisions at s_NN=2.76 TeV, by invariant mass analysis in the decay modes Λn‾→d‾π⁺ and H-dibaryon →Λpπ⁻. No evidence for these bound states is observed. Upper limits are determined at 99% confidence level for a wide range of lifetimes and for the full range of branching ratios. The results are compared to thermal, coalescence and hybrid UrQMD model expectations, which describe correctly the production of other loosely bound states, like the deuteron and the hypertriton.

Original language	English
Pages (from-to)	267-277
Number of pages	11
Journal	Physics Letters B
Volume	752
DOIs	https://doi.org/10.1016/j.physletb.2015.11.048
State	Published - 10 Jan 2016

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10.1016/j.physletb.2015.11.048

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@article{c8d5d2a2208e4a24ba730b0a628d73df,

title = "Search for weakly decaying Λn‾ and ΛΛ exotic bound states in central Pb–Pb collisions at √sNN=2.76 TeV",

abstract = "We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible Λn‾ bound state. The search is performed with the ALICE detector in central (0–10\%) Pb–Pb collisions at sNN=2.76 TeV, by invariant mass analysis in the decay modes Λn‾→d‾π+ and H-dibaryon →Λpπ−. No evidence for these bound states is observed. Upper limits are determined at 99\% confidence level for a wide range of lifetimes and for the full range of branching ratios. The results are compared to thermal, coalescence and hybrid UrQMD model expectations, which describe correctly the production of other loosely bound states, like the deuteron and the hypertriton.",

author = "\{ALICE Collaboration\} and J. Adam and D. Adamov{\'a} and Aggarwal, \{M. M.\} and \{Aglieri Rinella\}, G. and M. Agnello and N. Agrawal and Z. Ahammed and I. Ahmed and Ahn, \{S. U.\} and I. Aimo and S. Aiola and M. Ajaz and A. Akindinov and Alam, \{S. N.\} and D. Aleksandrov and B. Alessandro and D. Alexandre and \{Alfaro Molina\}, R. and A. Alici and A. Alkin and J. Alme and T. Alt and S. Altinpinar and I. Altsybeev and \{Alves Garcia Prado\}, C. and C. Andrei and A. Andronic and V. Anguelov and J. Anielski and T. Anti{\v c}i{\'c} and F. Antinori and P. Antonioli and L. Aphecetche and H. Appelsh{\"a}user and S. Arcelli and N. Armesto and R. Arnaldi and T. Aronsson and Arsene, \{I. C.\} and M. Arslandok and A. Augustinus and R. Averbeck and Azmi, \{M. D.\} and M. Bach and A. Badal{\`a} and Baek, \{Y. W.\} and S. Bagnasco and R. Bailhache and R. Bala and L. Fabbietti",

note = "Publisher Copyright: {\textcopyright} 2015 CERN for the benefit of the ALICE Collaboration",

year = "2016",

month = jan,

day = "10",

doi = "10.1016/j.physletb.2015.11.048",

language = "English",

volume = "752",

pages = "267--277",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Search for weakly decaying Λn‾ and ΛΛ exotic bound states in central Pb–Pb collisions at √sNN=2.76 TeV

AU - ALICE Collaboration

AU - Adam, J.

AU - Adamová, D.

AU - Aggarwal, M. M.

AU - Aglieri Rinella, G.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmed, I.

AU - Ahn, S. U.

AU - Aimo, I.

AU - Aiola, S.

AU - Ajaz, M.

AU - Akindinov, A.

AU - Alam, S. N.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alexandre, D.

AU - Alfaro Molina, R.

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Altinpinar, S.

AU - Altsybeev, I.

AU - Alves Garcia Prado, C.

AU - Andrei, C.

AU - Andronic, A.

AU - Anguelov, V.

AU - Anielski, J.

AU - Antičić, T.

AU - Antinori, F.

AU - Antonioli, P.

AU - Aphecetche, L.

AU - Appelshäuser, H.

AU - Arcelli, S.

AU - Armesto, N.

AU - Arnaldi, R.

AU - Aronsson, T.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Azmi, M. D.

AU - Bach, M.

AU - Badalà, A.

AU - Baek, Y. W.

AU - Bagnasco, S.

AU - Bailhache, R.

AU - Bala, R.

AU - Fabbietti, L.

PY - 2016/1/10

Y1 - 2016/1/10

N2 - We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible Λn‾ bound state. The search is performed with the ALICE detector in central (0–10%) Pb–Pb collisions at sNN=2.76 TeV, by invariant mass analysis in the decay modes Λn‾→d‾π+ and H-dibaryon →Λpπ−. No evidence for these bound states is observed. Upper limits are determined at 99% confidence level for a wide range of lifetimes and for the full range of branching ratios. The results are compared to thermal, coalescence and hybrid UrQMD model expectations, which describe correctly the production of other loosely bound states, like the deuteron and the hypertriton.

AB - We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible Λn‾ bound state. The search is performed with the ALICE detector in central (0–10%) Pb–Pb collisions at sNN=2.76 TeV, by invariant mass analysis in the decay modes Λn‾→d‾π+ and H-dibaryon →Λpπ−. No evidence for these bound states is observed. Upper limits are determined at 99% confidence level for a wide range of lifetimes and for the full range of branching ratios. The results are compared to thermal, coalescence and hybrid UrQMD model expectations, which describe correctly the production of other loosely bound states, like the deuteron and the hypertriton.

UR - https://www.scopus.com/pages/publications/85040844335

U2 - 10.1016/j.physletb.2015.11.048

DO - 10.1016/j.physletb.2015.11.048

M3 - Article

AN - SCOPUS:85040844335

SN - 0370-2693

VL - 752

SP - 267

EP - 277

JO - Physics Letters B

JF - Physics Letters B

ER -

Search for weakly decaying Λn‾ and ΛΛ exotic bound states in central Pb–Pb collisions at √s_NN=2.76 TeV

Abstract

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