Study of the Λ–Λ interaction with femtoscopy correlations in p p and p–Pb collisions at the LHC

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doi:10.1016/j.physletb.2019.134822

Title: Study of the Λ–Λ interaction with femtoscopy correlations in $p p$ and p–Pb collisions at the LHC

Journal Article · Tue Oct 01 00:00:00 EDT 2019 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2019.134822· OSTI ID:1547140

Acharya, S.; Adamová, D.; Adhya, S. P.; Adler, A.; Adolfsson, J.; Aggarwal, M. M.; Aglieri Rinella, G.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S. U.; Aiola, S.; Akindinov, A.; Al-Turany, M.; Alam, S. N.; Albuquerque, D. S. D.; Aleksandrov, D.; Alessandro, B.; Alfanda, H. M. more »

This work presents new constraints on the existence and the binding energy of a possible Λ–Λ bound state, the H-dibaryon, derived from Λ–Λ femtoscopic measurements by the ALICE collaboration. The results are obtained from a new measurement using the femtoscopy technique in (Figure presented.) collisions at $$\sqrt{s}$$=13 TeV and p–Pb collisions at $$\sqrt{sNN}$$=5.02 TeV, combined with previously published results from (Figure presented.) collisions at $$\sqrt{s}$$=7 TeV. The Λ–Λ scattering parameter space, spanned by the inverse scattering length ƒ₀^-1 and the effective range d₀, is constrained by comparing the measured Λ–Λ correlation function with calculations obtained within the Lednický model. The data are compatible with hypernuclei results and lattice computations, both predicting a shallow attractive interaction, and permit to test different theoretical approaches describing the Λ–Λ interaction. The region in the (ƒ₀^-1,d₀) plane which would accommodate a Λ–Λ bound state is substantially restricted compared to previous studies. The binding energy of the possible Λ–Λ bound state is estimated within an effective-range expansion approach and is found to be B_ΛΛ=3.2$$^{+1.6}_{-2.4}$$(stat)$$^{+1.8}_{-1.0}$$(syst) MeV.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: ALICE Collaboration

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725

OSTI ID:: 1547140

Alternate ID(s):: OSTI ID: 1581372; OSTI ID: 1821993

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 797 Journal Issue: C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 46 works

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