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

Sección de Física

Czech Technical University in Prague
Czech Academy of Sciences
Panjab University
CERN
Sezione INFN
Indian Institute of Technology Bombay
Variable Energy Cyclotron Centre
COMSATS University Islamabad
Korea Institute of Science and Technology Information
Polytechnic University of Turin
Yale University
Alikhanov Institute for Theoretical and Experimental Physics
Russian Research Centre Kurchatov Institute
University of Birmingham
Universidad Nacional Autónoma de México
Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi
National Institute for Nuclear Physics
Bogolyubov Institute for Theoretical Physics Nasu
Western Norway University of Applied Sciences
Frankfurt Institute for Advanced Studies
University of Bergen
St. Petersburg State University
Universidade de São Paulo
National Institute for Physics and Nuclear Engineering
GSI Helmholtzzentrum für Schwerionenforschung
Ruprecht-Karls-Universität Heidelberg
University of Münster
Ruder Boskovic Institute
Nantes Université
Goethe University Frankfurt
University of Bologna
Universidad de Santiago de Compostela
University of Oslo
Aligarh Muslim University
Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN
Gangneung-Wonju National University
University of Jammu
IRFU
Technical University of Munich
Institute of Physics Bhubaneswar
University of Catania
Hungarian Academy of Sciences
Université Clermont Auvergne
Central China Normal University
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
Joint Institute for Nuclear Research
University of Copenhagen
Indian Institute of Technology Indore
Université de Strasbourg
Benemérita Universidad Autónoma de Puebla
University of Houston
Wayne State University
Moscow Engineering Physics Institute
Petersburg Nuclear Physics Institute (PNPI)
Institute for Subatomic Physics of Utrecht University
Gauhati University
University of Tsukuba
INFN, Laboratori Nazionali Di Frascati
National Institute of Science Education and Research
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)
Lawrence Berkeley National Laboratory
Pavol Jozef Šafárik University
Pusan National University
STFC Daresbury Laboratory
National Research Foundation
National Institute for Subatomic Physics
Purdue University
University of Helsinki
Russian Federal Nuclear Center (VNIIEF)
Ohio State University
Pontifical Catholic Univ. of Peru
University of Tennessee
Sezione INFN
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear
University of Jyväskylä
University of Liverpool
Saha Institute of Nuclear Physics
Creighton University
Universite Claude Bernard Lyon 1
Universidade Estadual de Campinas
University of Lund
University of Cape Town
Université Grenoble Alpes
CNRS-IN2P3
Centro de Investigación y de Estudios AVanzados (CINVESTAV)
Oak Ridge National Laboratory
Institute of Space Science (ISS)
Bose Institute
National Centre for Nuclear Studies
University of Zagreb
Institute for High Energy Physics
RAS - Institute for Nuclear Research
National and Kapodistrian University of Athens
Chicago State University
University of Split
Warsaw University of Technology
A. Alikhanian Yerevan Institute of Physics
Tokyo University
Eberhard Karls Universität Tübingen
Sejong University
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
University of Rome La Sapienza
Comenius University
University of Belgrade
Polytechnic University of Bari
Konkuk University
Hiroshima University
Budker Institute for Nuclear Physics
University of Rajasthan
Laboratori Nazionali di Legnaro
Lawrence Livermore National Laboratory
University of Kansas
Centre de calcul de l'IN2P3
University of the Witwatersrand

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

37 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, Section B: Nuclear, Elementary Particle and High-Energy Physics
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{e3cea77c528145fe9005a5a9b5c6a72f,

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 Gago, \{A. M.\}",

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, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

}

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 - Gago, A. M.

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, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

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

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