First measurement of Λc+ production down to pT=0 in pp and p -Pb collisions at sNN=5.02 TeV

Acharya, S.; Adamová, D.; Adler, A.; Aglieri Rinella, G.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S. U.; Ahuja, I.; Akindinov, A.; Al-Turany, M.; Aleksandrov, D.; Alessandro, B.; Alfanda, H. M.; Alfaro Molina, R.; Ali, B.; Alici, A.; Alizadehvandchali, N.; Alkin, A.; Alme, J.; Alocco, G.; Alt, T.; Altsybeev, I.; Anaam, M. N.; Andrei, C.; Andronic, A.; Anguelov, V.; Antinori, F.; Antonioli, P.; Apadula, N.; Aphecetche, L.; Appelshäuser, H.; Arata, C.; Arcelli, S.; Aresti, M.; Arnaldi, R.; Arneiro, J. A.; Arsene, I. C.; Arslandok, M.; Augustinus, A.; Averbeck, R.; Azmi, M. D.; Badalà, A.; Bae, J.; Baek, Y. W.; Bai, X.; Bailhache, R.; Bailung, Y.; Balbino, A.; Baldisseri, A.; Balis, B.; Banerjee, D.; Banoo, Z.; Barbera, R.; Barile, F.; Barioglio, L.; Barlou, M.; Barnaföldi, G. G.; Barnby, L. S.; Barret, V.; Barreto, L.; Bartels, C.; Barth, K.; Bartsch, E.; Bastid, N.; Basu, S.; Batigne, G.; Battistini, D.; Batyunya, B.; Bauri, D.; Bazo Alba, J. L.; Bearden, I. 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doi:10.1103/physrevc.107.064901

First measurement of Λ c + production down to pT =0 in pp and p -Pb collisions at s NN =5.02 TeV

Journal Article · Mon Jun 05 00:00:00 EDT 2023 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.107.064901· OSTI ID:1989547

^[1]; ; Adler, A.; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »

Univ. Clermont Auvergne, Clermont-Ferrand (France); ALICE Collaboration et al.

The production of prompt $$Λ_{c}^{+}$$ baryons has been measured at midrapidity in the transverse momentum interval 0 < p_T < 1 GeV/c for the first time, in pp and p–Pb collisions at a center-of-mass energy per nucleon-nucleon collision $$\sqrt{s_{NN}}$$ = 5.02 TeV . The measurement was performed in the decay channel $$Λ_{c}^{+}$$ → p$$K_{S}^{0}$$ by applying new decay reconstruction techniques using a Kalman-Filter vertexing algorithm and adopting a machine-learning approach for the candidate selection. The p_T-integrated $$Λ_{c}^{+}$$ production cross sections in both collision systems were determined and used along with the measured yields in Pb–Pb collisions to compute the p_T-integrated nuclear modification factors R_pPb and R_AA of $$Λ_{c}^{+}$$ baryons, which are compared to model calculations that consider nuclear modification of the parton distribution functions. The $$Λ_{c}^{+}$$/D⁰ baryon-to-meson yield ratio is reported for pp and p–Pb collisions. Comparisons with models that include modified hadronization processes are presented, and the implications of the results on the understanding of charm hadronization in hadronic collisions are discussed. A significant (3.7σ) modification of the mean transverse momentum of $$Λ_{c}^{+}$$ baryons is seen in p –Pb collisions with respect to pp collisions, while the p_T-integrated $$Λ_{c}^{+}$$/D⁰ yield ratio was found to be consistent between the two collision systems within the uncertainties.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: ALICE Collaboration

Grant/Contract Number:: AC05-00OR22725; FG02-96ER40982

OSTI ID:: 1989547

Alternate ID(s):: OSTI ID: 2007776

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 107; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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