p-p, p-Λ , and Λ-Λ correlations studied via femtoscopy in pp reactions at s=7TeV

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doi:10.1103/physrevc.99.024001

Title: $p - p, p - Λ$ , and $Λ - Λ$ correlations studied via femtoscopy in $p p$ reactions at $\sqrt{s} = 7 TeV$

Journal Article · Fri Feb 01 00:00:00 EST 2019 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.99.024001· OSTI ID:1550872

Acharya, S.; Adamová, D.; Adolfsson, J.; Aggarwal, M. M.; Aglieri Rinella, G.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahn, S. U.; Aiola, S.; Akindinov, A.; Al-Turany, M.; Alam, S. N.; Albuquerque, D. S. D.; Aleksandrov, D.; Alessandro, B.; Alfaro Molina, R.; Ali, Y.; Alici, A.; Alkin, A. more »

We report on the first femtoscopic measurement of baryon pairs, such as p-p, p-Λ, and Λ-Λ, measured by ALICE at the Large Hadron Collider (LHC) in proton-proton collisions at $$ \sqrt{s}$$=7 TeV. This study demonstrates the feasibility of such measurements in pp collisions at ultrarelativistic energies. The femtoscopy method is employed to constrain the hyperon-nucleon and hyperon-hyperon interactions, which are still rather poorly understood. A new method to evaluate the influence of residual correlations induced by the decays of resonances and experimental impurities is hereby presented. The p-p, p-Λ, and Λ-Λ correlation functions were fitted simultaneously with the help of a new tool developed specifically for the femtoscopy analysis in small colliding systems: Correlation Analysis Tool using the Schrödinger equation (CATS). Within the assumption that in pp collisions the three particle pairs originate from a common source, its radius is found to be equal to r₀=1.125 ± 0.018 (stat) $$_{-0.035}^{+0.058}$$ (syst) fm. The sensitivity of the measured p-Λ correlation is tested against different scattering parameters, which are defined by the interaction among the two particles, but the statistics is not sufficient yet to discriminate among different models. The measurement of the Λ-Λ correlation function constrains the phase space spanned by the effective range and scattering length of the strong interaction. Discrepancies between the measured scattering parameters and the resulting correlation functions at LHC and RHIC energies are discussed in the context of various models.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

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

Contributing Organization:: ALICE Collaboration

DOE Contract Number:: AC02-05CH11231

OSTI ID:: 1550872

Journal Information:: Physical Review C, Vol. 99, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Measurement of nearly horizontal cosmic muons at high altitudes with the MEV telescope Bonanno, D.; Gallo, G.; La Rocca, P. The European Physical Journal Plus, Vol. 134, Issue 6 https://doi.org/10.1140/epjp/i2019-12683-1	journal	June 2019
First Observation of an Attractive Interaction between a Proton and a Cascade Baryon Acharya, Shreyasi; Adamova, Dagmar; Adhya, Souvik Priyam GSI Helmholtzzentrum fuer Schwerionenforschung, GSI, Darmstadt https://doi.org/10.15120/gsi-2020-00147	text	January 2019
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p-p, p-$\Lambda$ and $\Lambda$-$\Lambda$ correlations studied via femtoscopy in pp reactions at $\sqrt{s}$ = 7 TeV Acharya, Shreyasi; Torales-Acosta, Fernando; Adamova, Dagmar https://doi.org/10.17182/hepdata.89305 The current record is supplemented by this collection	collection	January 2019
p-p, p-$\Lambda$ and $\Lambda$-$\Lambda$ correlations studied via femtoscopy in pp reactions at $\sqrt{s}$ = 7 TeV Acharya, Shreyasi; Torales-Acosta, Fernando; Adamova, Dagmar https://doi.org/10.17182/hepdata.89305.v1 The current record is supplemented by this collection	collection	January 2019
Table 1 Acharya, Shreyasi; Torales-Acosta, Fernando; Adamova, Dagmar https://doi.org/10.17182/hepdata.89305.v1/t1 The current record is supplemented by this dataset	dataset	January 2019
Table 2 Acharya, Shreyasi; Torales-Acosta, Fernando; Adamova, Dagmar https://doi.org/10.17182/hepdata.89305.v1/t2 The current record is supplemented by this dataset	dataset	January 2019
Table 3 Acharya, Shreyasi; Torales-Acosta, Fernando; Adamova, Dagmar https://doi.org/10.17182/hepdata.89305.v1/t3 The current record is supplemented by this dataset	dataset	January 2019
Table 4 Acharya, Shreyasi; Torales-Acosta, Fernando; Adamova, Dagmar https://doi.org/10.17182/hepdata.89305.v1/t4 The current record is supplemented by this dataset	dataset	January 2019

Title: p - p , p - Λ , and Λ - Λ correlations studied via femtoscopy in p p reactions at s = 7 TeV

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