Speaker
Description
Measurements of charm-hadron production provide a fundamental test to validate the perturbative quantum chromodynamics (pQCD) calculation.
However, in recent years, an enhanced production of charm baryons relative to mesons was observed compared to $\mathrm{e}^{+}\mathrm{e}^{-}$ collisions, challenging the assumption of independent fragmentation adopted in pQCD calculations via the factorization theorem.
The observation has initiated a review of theory frameworks to explain the measurements by considering different process with respect to $\mathrm{e}^{+}\mathrm{e}^{-}$ collisions.
In particular, the measurements of charm baryons containing strangeness, such as $\Xi_{\mathrm{c}}^{0,+}$ and $\Omega_{\mathrm{c}}^{0}$, might have good constraint power for the theory calculations, as their predictions undershoot the measurements even though they include different hadronization scenarios to describe the measurements.
Therefore, precise measurements of charm baryons containing strangeness across wide $\it{p}_{\mathrm{T}}$ range are crucial to constrain the theory calculations.
At the LHC, a new data sample is being collected during Run 3 data-taking period, started in 2022 with upgraded ALICE detector.
The new dataset has improved resolution, thanks to the upgraded tracking detector during last LHC long shutdown 2 (LS 2), as well as a larger sample achieved by continuous readout of the Time Projection Chamber (TPC) detector.
Precise measurements over an extended $\it{p}_{\mathrm{T}}$ range using the new dataset are anticipated to provide further ingredients to understand hadronization mechanism of charm quarks.
In this contribution, a measurement of $\Xi_{\mathrm{c}}^{+}$ baryon in pp collisions at $\sqrt{\it{s}}$ = 13.6 TeV, collected with ALICE detector, will be presented.
The $\Xi_{\mathrm{c}}^{+}$ baryon is reconstructed via its hadronic decay channel, $\Xi_{\mathrm{c}}^{+} \rightarrow \Xi^{-}\pi^{+}\pi^{+}$, at midrapidity.
A machine learning-based background rejection approach exploiting Boosted Decision Tree (BDT) algorithm will be introduced.
The resulting $\it{p}_{\mathrm{T}}$-differential production cross section of $\Xi_{\mathrm{c}}^{+}$ baryon will be presented and compared with state-of-the-art models implementing different hadronization mechanisms.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | ALICE Collaboration |
