ausblenden:
Schlagwörter:
-
MPINP:
LHCb - Abteilung Hinton
Zusammenfassung:
A search for the doubly charmed baryon Xi(+)(cc) is performed in the
Xi(+)(c)pi(-)pi(+ )invariant-mass spectrum, where the Xi(-)(cc) baryon
is reconstructed in the pK(-)pi(+) final state. The study uses
proton-proton collision data collected with the LHCb detector at a
centreof-mass energy of 13 TeV, corresponding to a total integrated
luminosity of 5.4 fb(-1). No significant signal is observed in the
invariant-mass range of 3.4-3.8 GeV/c(2). Upper limits are set on the
ratio of branching fractions multiplied by the production cross-section
with respect to the Xi(++)(cc) -> (Xi(+)(c) -> pK(-)pi(+)+/-)pi(+ )
decay for different Xi(+)(cc) mass and lifetime hy- potheses in the
rapidity range from 2.0 to 4.5 and the transverse momentum range from
2.5 to 25 GeV/c. The results from this search are combined with a
previously published search for the Xi(+)(cc) -> A(c)(+)K(-)pi(+ ) decay
mode, yielding a maximum local significance of 4.0 standard deviations
around the mass of 3620 MeV/c(2), including systematic uncertainties.
Taking into account the look-elsewhere effect in the 3.5-3.7 GeV/c(2)
mass window, the combined global significance is 2.9 standard deviations
including systematic uncertainties.