Measurement of the cross sections of Ξc0 and Ξc+ baryons and branching-fraction ratio BR(Ξc0Ξe+νe)/BR(Ξc0Ξπ+) in pp collisions at 13 TeV

The ALICE collaboration
Phys.Rev.Lett. 127 (2021) 272001, 2021.

Abstract (data abstract)
The pT-differential cross sections of prompt charm-strange baryons Ξc0 and Ξc+ were measured at midrapidity (|y|<0.5) in proton--proton (pp) collisions at a centre-of-mass energy s=13 TeV with the ALICE detector at the LHC. The Ξc0 baryon was reconstructed via both the semileptonic decay (Ξe+νe) and the hadronic decay (Ξπ+) channels. The Ξc+ baryon was reconstructed via the hadronic decay (Ξπ+π+) channel. The branching-fraction ratio BR(Ξc0Ξe+νe)/BR(Ξc0Ξπ+)= 1.38 ± 0.14 (stat) ± 0.22 (syst) was measured with a total uncertainty reduced by a factor of about 3 with respect to the current world average reported by the Particle Data Group. The transverse momentum (pT) dependence of the Ξc0- and Ξc+-baryon production relative to the D0-meson and to the Σc0,+,++- and Λc+-baryon production are reported. The baryon-to-meson ratio increases towards low pT up to a value of approximately 0.3. The measurements are compared with various models that take different hadronisation mechanisms into consideration. The results provide stringent constraints to these theoretical calculations and additional evidence that different processes are involved in charm hadronisation in electron--positron (e+e) and hadronic collisions.

  • Table 1

    Data from Figure 1 (full circles), Page 5

    10.17182/hepdata.115272.v2/t1

    Cross section of prompt Ξc0 baryon as a function of pT in pp collisions at s=13 TeV for...

  • Table 2

    Data from Figure 1 (open circles), Page 5

    10.17182/hepdata.115272.v2/t2

    Cross section of prompt Ξc+ baryon as a function of pT in pp collisions at s=13 TeV for...

  • Table 3

    Data from Figure 2 left pannel, Page 6

    10.17182/hepdata.115272.v2/t3

    Ξc0/D0 ratio as a function of pT in pp collisions at s=13 TeV for |y|<0.5.

  • Table 4

    Data from Figure 2 left pannel, Page 6

    10.17182/hepdata.115272.v2/t4

    Ξc+/D0 ratio as a function of pT in pp collisions at s=13 TeV for |y|<0.5.

  • Table 5

    Data from Figure 2 right pannel, Page 6

    10.17182/hepdata.115272.v2/t5

    Ξc0/Λc+ ratio as a function of pT in pp collisions at s=13 TeV for |y|<0.5.

  • Table 6

    Data from Figure 2 right pannel, Page 6

    10.17182/hepdata.115272.v2/t6

    Ξc0,+/Σc0,+,++ ratio as a function of pT in pp collisions at s=13 TeV for |y|<0.5.

  • Table 7

    10.17182/hepdata.115272.v2/t7

    The pT integrated cross section of prompt Ξc0baryon production in pp collisions at 13 TeV for $|y| <...

  • Table 8

    10.17182/hepdata.115272.v2/t8

    The pT integrated cross section of prompt Ξc0baryon production in pp collisions at 13 TeV for $|y| <...

  • Table 9

    10.17182/hepdata.115272.v2/t9

    The pT integrated cross section of prompt Ξc+baryon production in pp collisions at 13 TeV for $|y| <...

  • Table 10

    10.17182/hepdata.115272.v2/t10

    The branching-fraction ratio BR(Ξc0Ξe+νe)/BR(Ξc0Ξπ+) in pp collisions at 13 TeV for |y|<0.5.

Version 2 modifications: The Table 7 has been splited in two for the Rivetisation

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