Observation of a new baryon state in the $ {\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-} $ mass spectrum - INSPIRE

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Observation of a new baryon state in the ${\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-}$ mass spectrum

LHCb

Collaboration

Feb 12, 2020

24 pages

Published in:

JHEP 06 (2020) 136

Published: Jun 23, 2020

e-Print:

2002.05112 [hep-ex]

DOI:

10.1007/JHEP06(2020)136

PDG:

{{\mathit \Lambda}_{{{b}}}{(5912)}^{0}}

\rightarrow

{{\mathit \Lambda}_{{{b}}}^{0}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}

Report number:

CERN-EP-2020-013,
LHCb-PAPER-2019-045

Experiments:

CERN-LHC-LHCb

View in:

reference search66 citations

Citations per year

Abstract: (Springer)

A new baryon state is observed in the

{\Lambda}_{\mathrm{b}}^0{\pi}^{+}{\pi}^{-}

mass spectrum with high significance using a data sample of pp collisions, collected with the LHCb detector at centre-of-mass energies

\sqrt{s}

= 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb

^{−1}

. The mass and natural width of the new state are measured to be

\begin{array}{l}m=6072.3\pm 2.9\pm 0.6\pm 0.2\ \mathrm{MeV},\\ {}\Gamma =72\pm 11\pm 2\ \mathrm{MeV},\end{array}

where the first uncertainty is statistical and the second systematic. The third uncertainty for the mass is due to imprecise knowledge of the

{\Lambda}_{\mathrm{b}}^0

baryon mass. The new state is consistent with the first radial excitation of the

{\Lambda}_{\mathrm{b}}^0

baryon, the Λ

_{b}

(2S)

^{0}

resonance. Updated measurements of the masses and the upper limits on the natural widths of the previously observed Λ

_{b}

(5912)

^{0}

and Λ

_{b}

(5920)

^{0}

states are also reported.[graphic not available: see fulltext]

Note:

24 pages, 6 figures, All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-045.html

B physics
Hadron-Hadron scattering (experiments)
Heavy quark production
Spectroscopy
p p: colliding beams
baryon: mass: measured
baryon: width
width: measured
p p: scattering
mass spectrum: (Lambda/b0 pi+ pi-)

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