Hypertriton Production in p-Pb Collisions at $\sqrt {s_{NN}}$=5.02 TeV - INSPIRE

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Hypertriton Production in p-Pb Collisions at $\sqrt {s_{NN}}$ =5.02 TeV

Collaborations

Jul 22, 2021

19 pages

Published in:

Phys.Rev.Lett. 128 (2022) 25, 252003

Published: Jun 23, 2022

e-Print:

2107.10627 [nucl-ex]

DOI:

10.1103/PhysRevLett.128.252003 (publication)

Report number:

CERN-EP-2021-139

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (APS)

The study of nuclei and antinuclei production has proven to be a powerful tool to investigate the formation mechanism of loosely bound states in high-energy hadronic collisions. The first measurement of the production of

{}_{Λ}^{3}H

in

p

-Pb collisions at

\sqrt{s_{NN}} = 5.02 TeV

is presented in this Letter. Its production yield measured in the rapidity interval

- 1 < y < 0

for the 40% highest-multiplicity

p

-Pb collisions is

d N / d y = [6.3 \pm 1.8 (stat) \pm 1.2 (syst)] \times 10^{- 7}

. The measurement is compared with the expectations of statistical hadronization and coalescence models, which describe the nucleosynthesis in hadronic collisions. These two models predict very different yields of the hypertriton in charged particle multiplicity environments relevant to small collision systems such as

p

-Pb, and therefore the measurement of

d N / d y

is crucial to distinguish between them. The precision of this measurement leads to the exclusion with a significance larger than

6.9 σ

of some configurations of the statistical hadronization model, thus constraining the theory behind the production of loosely bound states at hadron colliders.

Note:

19 pages, 3 captioned figures, authors from page 13, published version, figures at http://alice-publications.web.cern.ch/node/7223

hadronization: statistical
hadron hadron: interaction
antinucleus: production
yield: measured
model: coalescence
TeV
bound state
multiplicity
nucleosynthesis
nucleus

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