Study of the B−→Λ_c+Λ¯_(c¯)K¯ decay
The decay B−→Λ_c+Λ¯_(c¯)K¯ is studied in proton-proton collisions at a center-of-mass energy of root s = 13 TeV using data corresponding to an integrated luminosity of 5 fb(-1) collected by the LHCb experiment. In the Lambda K-+(c)- system, the Xi(c)(2930)(0) state observed at the BABAR and Belle experiments is resolved into two narrower states, Xi(c)(2923)(0) and Xi(c)(2939)(0), whose masses and widths are measured to be m(Xi(c)(2930)(0) = 2924.5 +/- 0.4 +/- 1.1 Mev, m Xi(c)(2930)(0)) = 2938.5 +/- 0.9 +/- 2.3 Mev, Gamma(Xi(c)(2930)(0)) = 4.8 +/- 0.9 +/- 1.5 MeV, Gamma(Xi(c)(2930)(0) - 11.0 +/- 1.9 +/- 7.5 MeV, where the first uncertainties are statistical and the second systematic. The results are consistent with a previous LHCb measurement using a prompt Lambda K-+(c)- sample. Evidence of a new Xi(c)(2930)(0) state is found with a local significance of 3.8 sigma, whose mass and width are measured to be 2881.8 +/- 3.1 +/- 8.5 MeV and 12.4 +/- 5.3 +/- 5.8 MeV, respectively. In addition, evidence of a new decay mode Xi(c)(2930)(0) -> Lambda K-+(c) is found with a significance of 3.7 sigma. The relative branching fraction of B- -> Lambda(+)(c)(Lambda) over bar K--(c)- with respect to the B- -> D+D-K- decay is measured to be 2.36 +/- 0.11 +/- 0.22 +/- 0.25, where the first uncertainty is statistical, the second systematic and the third originates from the branching fractions of charm hadron decays.
WOS:001063966800001
2023-07-27
108
1
012020
REVIEWED
Funder | Grant Number |
BMBF, DFG | |
CERN | |
CAPES | |
CNPq | |
FAPERJ | |
FINEP (Brazil) | |
MOST | |
NSFC (China) | |
CNRS/IN2P3 (France) | |
BMBF | |
DFG | |
MPG (Germany) | |
INFN (Italy) | |
NWO (Netherlands) | |
MNiSW | |
NCN (Poland) | |
MEN/IFA (Romania) | |
MICINN (Spain) | |
SNSF (Switzerland) | |
SER (Switzerland) | |
NASU (Ukraine) | |
STFC (United Kingdom) | |
DOE NP | |
NSF (USA) | |
ARC | |
ARDC (Australia) | |
Minciencias (Colombia) | |
AvH Foundation (Germany) | |
EPLANET | |
Marie Sklodowska-Curie Actions | |
ERC (European Union) | |
A*MIDEX | |
ANR | |
IPhU | |
Labex P2IO | |
Region Auvergne-Rhone-Alpes (France) | |
Key Research Program of Frontier Sciences of CAS | |
CAS PIFI | |
CAS CCEPP | |
Fundamental Research Funds for the Central Universities | |
Sci. amp; Tech. Program of Guangzhou (China) | |
GVA | |
XuntaGal | |
GENCAT | |
Prog. Atraccion Talento | |
CM (Spain) | |
SRC (Sweden) | |
Leverhulme Trust | |
Royal Society | |
UKRI (United Kingdom) | |