Measurement of the Cross Sections of $$Ξ_{c}^{0}$$ and $$Ξ_{c}^{+}$$ Baryons and of the Branching-Fraction Ratio $$BR(Ξ_{c}^{0} → Ξ^–e^+ν_e)/BR(Ξ_{c}^{0} → Ξ^–π^+)$$ in pp Collisions at $$\sqrt{s}$$ = 13 TeV
The pT-differential cross sections of prompt charm-strange baryons $$Ξ_{c}^{0}$$ and $$Ξ_{c}^{+}$$ were measured at midrapidity (|y|<0.5) in proton-proton (pp) collisions at a center-of-mass energy $$\sqrt{s}$$ = 13 TeV with the ALICE detector at the LHC. The $$Ξ_{c}^{0}$$ baryon was reconstructed via both the semileptonic decay $$(Ξ^–e^+ν_e)$$ and the hadronic decay $(Ξ^–π^+)$ channels. The $$Ξ_{c}^{0}$$ baryon was reconstructed via the hadronic decay $(Ξ^–π^+π^+)$ channel. The branching-fraction ratio $$BR(Ξ_{c}^{0} → Ξ^–e^+νe)/BR(Ξ_{c}^{0} → Ξ^–π^+)$$ =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 $$Ξ_{c}^{0}$$ and $$Ξ_{c}^{+}$$-baryon production relative to the D0 meson and to the $$Σ^{0,+,++}_{c}$$- and $$Λ^{+}_{c}$$-baryon production are reported. The baryon-to-meson ratio increases toward low pT up to a value of approximately 0.3. The measurements are compared with various models that take different hadronization mechanisms into consideration. The results provide stringent constraints to these theoretical calculations and additional evidence that different processes are involved in charm hadronization in electron-positron (e+e–) and hadronic collisions.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- Large Ion Collider Experiment Collaboration
- Grant/Contract Number:
- AC05-00OR22725; AC02-05CH11231; FG02-96ER40982
- OSTI ID:
- 1837613
- Alternate ID(s):
- OSTI ID: 1885258; OSTI ID: 1898382; OSTI ID: 2007940
- Journal Information:
- Physical Review Letters, Vol. 127, Issue 27; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Measurement of the production cross section of prompt $ {\Xi}_{\mathrm{c}}^0 $ baryons at midrapidity in pp collisions at $ \sqrt{s} $ = 5.02 TeV
First measurement of production in pp collisions at