Studying charm hadronisation into baryons with azimuthal correlations of Λc+ with charged particles in pp collisions at √s=13TeV

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The distribution of angular correlations between prompt charm hadrons and primary charged particles in pp collisions is sensitive to the charm-quark hadronisation process. In this letter, charm-baryon correlations are measured for the first time by studying the azimuthal-angle difference between charged particles and prompt Lambda(+)(c) baryons produced in pp collisions at a centre-of-mass energy of root s=13 TeV, with the ALICE detector. Lambda(+)(c) baryons are reconstructed at midrapidity (|y|<0.5) in the transverse-momentum interval 3<p(T)<16 GeV/c, and correlated with charged particles with p(T)>0.3 GeV/c and pseudorapidity |eta|<0.8. For 3<p(T)(Lambda c+,D)<5 GeV/c, the comparison with published measurements of D-meson and charged-particle correlations in the same collision system hints at a larger number of low-momentum particles associated with Lambda(+)(c)-baryon triggers than with D-meson triggers, both in the collinear and opposite directions with respect to the trigger particle. These differences can be quantified by the comparison of the properties of the near- and away-side correlation peaks, and are not reproduced by predictions of various Monte Carlo event generators, generally underpredicting the associated particle yields at p(T)(assoc)<1 GeV/c. This tension between Lambda(+)(c)-baryon and D-meson associated peak yields could suggest a modified fragmentation of the charm quark, or a different hadronisation process, when a charm baryon is produced in the final state.

제목
Studying charm hadronisation into baryons with azimuthal correlations of Λc+ with charged particles in pp collisions at √s=13TeV
저자
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DOI
10.1016/j.physletb.2025.139681
발행일
2025-09
유형
Article
저널명
PHYSICS LETTERS B
868