2023-09-20
08:41 |
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2023-09-20
08:41 |
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2023-09-16
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2023-09-13
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2023-09-07
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2023-09-06
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2023-09-06
06:06 |
Measurement of the Hypertriton Properties and Production with ALICE
/ Mazzaschi, Francesco (INFN, Turin)
/ALICE Collaboration
The hypertriton (3
ΛH) is a bound state of a proton, a neutron, and
a Λ baryon. Studying its internal structure is crucial to investigate the
hyperon–nucleon (Y –N) strong interaction and offers insights into the inner
core of neutron stars, where Λ production is favoured. [...]
2023 - 6 p.
- Published in : Acta Phys. Pol. B Proc. Suppl.: 16 (2023) , no. 1, pp. 149
Fulltext: PDF;
In : 29th International Conference on Ultra-relativistic Nucleus-Nucleus Collisions, Krakow, Poland, 4 - 10 Apr 2022, pp.149
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2023-09-06
06:06 |
Thermal radiation and direct photon production in Pb-Pb and pp collisions with dielectrons in ALICE
/ Sekihata, Daiki (Tokyo U., CNS)
/ALICE Collaboration
Dielectrons are unique tools to study the space-time evolution of the hot and dense QCD matter created in ultra-relativistic heavy-ion collisions.
They are produced by a variety of processes during all stages of the collision with negligible final-state interactions.
Thermal radiation from the hadronic phase contributes to the spectrum at low invariant mass ($m_{\rm ee}$),
while thermal radiation from the quark-gluon plasma (QGP) at larger $m_{\rm ee}$ carries information about the early temperature of the medium.
The latter is dominated by a large background from semileptonic decays of correlated heavy-flavor hadrons affected by parton energy loss and flow in the medium.
In the quasi-real virtual photon region where $m_{\rm ee} \ll p_{\rm T,ee}$, the direct photon fraction can be extracted from the $m_{\rm ee}$ spectrum as a function of transverse momentum ($p_{\rm T,ee}$).
In pp collisions, such measurement serves as a fundamental test for perturbative QCD calculations and as a baseline for the studies in heavy-ion collisions.
We discuss the latest ALICE results on dielectron production in Pb--Pb and pp collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV and $\sqrt{s}$ = 13 TeV, respectively.
The results are compared with the expected dielectron yield from known hadronic sources and predictions for thermal radiation from the medium.
The production of direct photons in the different colliding systems including high-multiplicity pp collisions is also reported..
2022 - 6 p.
- Published in : PoS: ICHEP2022, pp. 452
Fulltext: PDF;
In : 41st International Conference on High Energy Physics (ICHEP 2022), Bologna, Italy, 6 - 13 Jul 2022, pp.452
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2023-09-06
06:06 |
$J/\psi$ Photoproduction Results from ALICE
/ Herman, T (CTU, Prague)
/ALICE Collaboration
Diffractive photoproduction of J/ψ vector mesons is studied at the LHC
with the ALICE detector in p–Pb and Pb–Pb ultra-peripheral collisions
(UPCs), where the Pb ions act as powerful sources of quasi-real photons.
In this contribution, the first measurement at the LHC of dissociative photoproduction
of J/ψ off protons is presented; this process is sensitive to
quantum fluctuations of the structure of the target at the subnucleon level.
In addition, cross sections for the exclusive channel and for continuum
dimuon production at small masses were obtained in the same kinematic
region. This latter process probes our simultaneous understanding, in a
new kinematic region, of the photon flux emitted by protons and by lead
ions. [...]
2023 - 6 p.
- Published in : Acta Phys. Pol. B Proc. Suppl.: 16 (2023) , no. 1, pp. 98
Fulltext: PDF;
In : 29th International Conference on Ultra-relativistic Nucleus-Nucleus Collisions, Krakow, Poland, 4 - 10 Apr 2022, pp.98
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2023-09-06
06:06 |
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