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3ΛH and3ΛH production in Pb-Pb collisions at √sNN=2.76 TeV

  • Author(s): Adam, J
  • Adamová, D
  • Aggarwal, MM
  • Aglieri Rinella, G
  • Agnello, M
  • Agrawal, N
  • Ahammed, Z
  • Ahn, SU
  • Aimo, I
  • Aiola, S
  • Ajaz, M
  • Akindinov, A
  • Alam, SN
  • Aleksandrov, D
  • Alessandro, B
  • Alexandre, D
  • Alfaro Molina, R
  • Alici, A
  • Alkin, A
  • Alme, J
  • Alt, T
  • Altinpinar, S
  • Altsybeev, I
  • Alves Garcia Prado, C
  • Andrei, C
  • Andronic, A
  • Anguelov, V
  • Anielski, J
  • Antičić, T
  • Antinori, F
  • Antonioli, P
  • Aphecetche, L
  • Appelshäuser, H
  • Arcelli, S
  • Armesto, N
  • Arnaldi, R
  • Arsene, IC
  • Arslandok, M
  • Audurier, B
  • Augustinus, A
  • Averbeck, R
  • Azmi, MD
  • Bach, M
  • Badalà, A
  • Baek, YW
  • Bagnasco, S
  • Bailhache, R
  • Bala, R
  • Baldisseri, A
  • Baltasar Dos Santos Pedrosa, F
  • Baral, RC
  • Barbano, AM
  • Barbera, R
  • Barile, F
  • Barnaföldi, GG
  • Barnby, LS
  • Barret, V
  • Bartalini, P
  • Barth, K
  • Bartke, J
  • Bartsch, E
  • Basile, M
  • Bastid, N
  • Basu, S
  • Bathen, B
  • Batigne, G
  • Batista Camejo, A
  • Batyunya, B
  • Batzing, PC
  • Bearden, IG
  • Beck, H
  • Bedda, C
  • Behera, NK
  • Belikov, I
  • Bellini, F
  • Bello Martinez, H
  • Bellwied, R
  • Belmont, R
  • Belmont-Moreno, E
  • Belyaev, V
  • Bencedi, G
  • Beole, S
  • Berceanu, I
  • Bercuci, A
  • Berdnikov, Y
  • Berenyi, D
  • Bertens, RA
  • Berzano, D
  • Betev, L
  • Bhasin, A
  • Bhat, IR
  • Bhati, AK
  • Bhattacharjee, B
  • Bhom, J
  • Bianchi, L
  • Bianchi, N
  • et al.
Abstract

© 2016 CERN for the benefit of the ALICE Collaboration. The production of the hypertriton nuclei HΛ3 and H[U+203E]Λ-3 has been measured for the first time in Pb-Pb collisions at sNN=2.76 TeV with the ALICE experiment at LHC. The pT-integrated HΛ3 yield in one unity of rapidity, dN/dy×B.R.(HΛ3→He3,π-)=(3.86±0.77(stat.)±0.68(syst.))×10-in the 0-10% most central collisions, is consistent with the predictions from a statistical thermal model using the same temperature as for the light hadrons. The coalescence parameter B3shows a dependence on the transverse momentum, similar to the B2of deuterons and the B3of3He nuclei. The ratio of yields S3=HΛ3/(He3×Λ/p) was measured to be S3=0.60±0.13(stat.)±0.21(syst.) in 0-10% centrality events; this value is compared to different theoretical models. The measured S3is compatible with thermal model predictions. The measured HΛ3 lifetime, τ=181-39+54(stat.)±33(syst.)ps is in agreement within 1σ with the world average value.

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