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Combining charm results from LHC experiments: Work on going!

Goals of the project

This HonexComb project aims at combining open charm measurements obtained by the four collaboration in p-p collisions at the LHC.

The goals of this effort are:

  • collecting in a common database the relevant charm measurements in pp collisions in a consistent ROOT/txt format.
  • providing summary plots to be used in review papers and summary talks.
  • provide comprehensive comparisons to theoretical calculations in the various rapidity and transverse momentum regions.
  • encourage the development of dedicated tunes for theoretical calculations (e.g. Pythia) that consider the knowledge acquired after 10 years of charm measurements at the LHC.
  • favour the creation of common and unique inputs for charm differential cross-sections vs pT and rapidity to be used as input for AA theoretical calculations.
  • provide an estimation of the total charm cross section, which incorporates the constraints coming from the various LHC experiments.

References and material

  • An overview of the project can be found in slides
  • Provide feedback: link

Recent HONEX Reports:

Collaborators:

  • Coordinators: Giulia Manca (Cagliari-LHCb), Raphael Granier de Cassagnac (LLR-CMS), Achim Geiser (Desy-CMS)
  • Workforce: Jiayin Sun (Cagliari-LHCb), M. Mazzilli (CERN-ALICE), J. Metwally (Desy-CMS), Gian Michele Innocenti (CERN-ALICE).

Database of LHC charm results in pp collisions at 5 TeV

Experiment Ref. code Hadronic decays ArXiv link Journal link HEPData
ALICE EPJC 79, 388 (2019) $D^{0} \rightarrow K^{-}\pi^{+}$, $D^{+} \rightarrow K^{-} \pi^{+} \pi^{+}$, $D_{s}^{+} \rightarrow \phi \pi^{+} \rightarrow K^{+} K^{-} \pi^{+}$, $D^{*+} \rightarrow D^{0}\pi^{+}$ (+ c.c.) arXiv journal HEPData
ALICE PRL 127, 202301 $\Lambda_{c}^{+} \rightarrow pK^{-}\pi^{+}$, $\Lambda_{c}^{+} \rightarrow pK^{0}_{S}$ (+ c.c.) arXiv journal FIXME
ALICE PRC 104, 054905 $\Lambda_{c}^{+} \rightarrow pK^{-}\pi^{+}$, $\Lambda_{c}^{+} \rightarrow pK^{0}_{S}$ (+ c.c.) arXiv journal FIXME
CMS PLB, v. 782, 2018, p 474-496 $D^{0} \rightarrow K^{-}\pi^{+}$ (+ c.c.) arXiv journal HEPData
CMS PLB, v. 803, 2020, 135328 $\Lambda_{c}^{+} \rightarrow pK^{-}\pi^{+}$ (+ c.c.) arXiv journal FIXME
LHCb JHEP, 147 (2017) $D^{0} \rightarrow K^{-}\pi^{+}$, $D^{+} \rightarrow K^{-} \pi^{+} \pi^{+}$, $D_{s}^{+} \rightarrow \phi \pi^{+} \rightarrow K^{+} K^{-} \pi^{+}$, $D^{*+} \rightarrow D^{0}\pi^{+}$ (+ c.c.) arXiv journal HEPData

Database of LHC charm results in pp collisions at 7 TeV

Experiment Ref. code Hadronic decays ArXiv link Journal link HEPData
LHCb XXX Baryons (FIXME) (+ c.c.) arXiv journal FIXME
LHCb Nucl. Phys. B871 (2013) 1 $D^{0} \rightarrow K^{-}\pi^{+}$, $D^{+} \rightarrow K^{-} \pi^{+} \pi^{+}$, $D^{*+} \rightarrow D^{0}\pi^{+}$, $D_{s}^{+} \rightarrow \phi \pi^{+} \rightarrow K^{+} K^{-} \pi^{+}$, $\Lambda_{c}^{+} \rightarrow pK^{-}\pi^{+}$(+ c.c.) arXiv journal FIXME

Database of branching fractions and branching ratios:

Hadron Branching fraction Uncertainty Reference
$c \rightarrow D^{0}$ (+ c.c.) XX XX link
$c \rightarrow D^{+}$ (+ c.c.) XX XX link
$c \rightarrow D_{s}^{+}$ (+ c.c.) XX XX link
$c \rightarrow \Lambda_{c}^{+}$ (+ c.c.) XX XX link

Decay Branching ratio Reference
$D^{0} \rightarrow K^{-}\pi^{+}$ $3.950 \pm 0.031$% pdg
$D^{+} \rightarrow K^{-} \pi^{+} \pi^{+}$ $9.38 \pm 0.16$% pdg
$D_{s}^{+} \rightarrow \phi \pi^{+} \rightarrow K^{+} K^{-} \pi^{+}$ $2.24 \pm 0.08$% pdg
$\Lambda_{c} \rightarrow p K^{-}\pi^{+}$ $6.28 \pm 0.32$% pdg
$\Lambda_{c} \rightarrow p K_{s}^{0} \rightarrow p \pi^{+} \pi^{-} $ $1.10 \pm 0.06$% pdg

Preliminary comparison plots


Plot Description

cXS_vs_pt_all_lowpt.png

FIXME

cXS_vs_pt_all_lowpt.png

FIXME

cXS_vs_pt_all_lowpt.png

FIXME

cXS_vs_pt_all_lowpt.png

FIXME

cXS_vs_pt_all_lowpt.png

FIXME

Restricted area

HonexcombCharmSectionRestricted

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