Production of $\Lambda$ and $K^0_s$ in jets in p–Pb collisions at $\sqrt {s_{NN}}$=5.02 TeV and pp collisions at $\sqrt {s}$=7 TeV - INSPIRE

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Production of $\Lambda$ and $K^0_s$ in jets in p–Pb collisions at $\sqrt {s_{NN}}$ =5.02 TeV and pp collisions at $\sqrt {s}$ =7 TeV

ALICE

Collaboration

May 11, 2021

15 pages

Published in:

Phys.Lett.B 827 (2022) 136984

Published: Apr 10, 2022

e-Print:

2105.04890 [nucl-ex]

DOI:

10.1016/j.physletb.2022.136984 (publication)

Report number:

CERN-EP-2021-048

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Elsevier B.V.)

The production of Λ baryons and

K_{S}^{0}

mesons (

V^{0}

particles) was measured in p–Pb collisions at

\sqrt{s_{NN}} = 5.02

TeV and pp collisions at

\sqrt{s} = 7

TeV with ALICE at the LHC. The production of these strange particles is studied separately for particles associated with hard scatterings and the underlying event to shed light on the baryon-to-meson ratio enhancement observed at intermediate transverse momentum (

p_{T}

) in high multiplicity pp and p–Pb collisions. Hard scatterings are selected on an event-by-event basis with jets reconstructed with the anti-

k_{T}

algorithm using charged particles. The production of strange particles associated with jets

p_{T, jet}^{ch} > 10

and

p_{T, jet}^{ch} > 20

GeV/c in p–Pb collisions, and with jet

p_{T, jet}^{ch} > 10

GeV/c in pp collisions is reported as a function of

p_{T}

. Its dependence on angular distance from the jet axis,

R (V^{0}, jet)

, for jets with

p_{T, jet}^{ch} > 10

GeV/c in p–Pb collisions is reported as well. The

p_{T}

-differential production spectra of strange particles associated with jets are found to be harder compared to that in the underlying event and both differ from the inclusive measurements. In events containing a jet, the density of the

V^{0}

particles in the underlying event is found to be larger than the density in the minimum bias events. The

Λ / K_{S}^{0}

ratio associated with jets in p–Pb collisions is consistent with the ratio in pp collisions and follows the expectation of jets fragmenting in vacuum. On the other hand, this ratio within jets is consistently lower than the one obtained in the underlying event and it does not show the characteristic enhancement of baryons at intermediate

p_{T}

often referred to as “baryon anomaly” in the inclusive measurements.

Note:

26 pages, 6 captioned figures, 3 tables, authors from page 21, published version, same contents as v2 with rearranged structure of source files, figures at http://alice-publications.web.cern.ch/node/7039

Lambda: production
K0(S): production
p nucleus: scattering
p p: scattering
strange particle: production
multiplicity: high
PYTHIA
Monte Carlo
experimental results
5000 GeV-cms/nucleon

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Figures(0)

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