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S. Wilks, The large-sample distribution of the likelihood ratio for testing composite hypotheses
1938
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J. Blatt and V. Weisskopf, Theoretical nuclear physics
1952
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M. Gell-Mann, A schematic model of baryons and mesons
1964
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J. D. Jackson, Remarks on the phenomenological analysis of resonances
1964
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CERN-TH-412 , reprinted in Developments in the Quark Theory of Hadrons 1
G. Zweig, An SU(3) model for strong interaction symmetry and its breaking · 1980
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D. J. Lange, The EvtGen particle decay simulation package
2001
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Geant4 collaboration, S. Agostinelli et al
2003
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D. Ebert, R. N. Faustov, and V. O. Galkin, Masses of heavy baryons in the relativistic quark model
2005
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T. Sjöstrand, S. Mrenna, and P. Skands, PYTHIA 6.4 physics and manual
2006
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P. Golonka and Z. Was, PHOTOS Monte Carlo: A precision tool for QED corrections in Z Z and W W decays
2006
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Geant4 collaboration, J. Allison et al
2006
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CDF collaboration, T. Aaltonen et al
Original
2007
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D0 collaboration, V. Abazov et al
Original
2007
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Belle collaboration, R. Mizuk et al
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X. Liu et al
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2008
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E. E. Jenkins, Model-independent bottom baryon mass predictions in the 1 / N c 1/N_{c} expansion
Original
2008
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2014

Observation of two new $\Xi_b^-$ baryon resonances

LHCb collaboration, Aaij, R., Adeva, B. et al.

Understand

Two structures are observed close to the kinematic threshold in the $\Xi_b^0 \pi^-$ mass spectrum in a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb$^{-1}$ recorded by the LHCb experiment.

In the quark model, two baryonic resonances with quark content $bds$ are expected in this mass region: the spin-parity $J^P = \frac{1}{2}^+$ and $J^P=\frac{3}{2}^+$ states, denoted $\Xi_b^{\prime -}$ and $\Xi_b^{*-}$.
Interpreting the structures as these resonances, we measure the mass differences and the width of the heavier state to be $m(\Xi_b^{\prime -}) - m(\Xi_b^0) - m(\pi^{-}) = 3.653 \pm 0.018 \pm 0.006$ MeV$/c^2$, $m(\Xi_b^{*-}) - m(\Xi_b^0) - m(\pi^{-}) = 23.96 \pm 0.12 \pm 0.06$ MeV$/c^2$, $\Gamma(\Xi_b^{*-}) = 1.65 \pm 0.31 \pm 0.10$ MeV, where the first and second uncertainties are statistical and systematic, respectively.
The width of the lighter state is consistent with zero, and we place an upper limit of $\Gamma(\Xi_b^{\prime -}) < 0.08$ MeV at 95% confidence level.

Built on

S. Wilks, The large-sample distribution of the likelihood ratio for testing composite hypotheses
1938
Earlier work this paper cites.
J. Blatt and V. Weisskopf, Theoretical nuclear physics
1952
Earlier work this paper cites.
M. Gell-Mann, A schematic model of baryons and mesons
1964
Earlier work this paper cites.
J. D. Jackson, Remarks on the phenomenological analysis of resonances
1964
Earlier work this paper cites.
CERN-TH-412 , reprinted in Developments in the Quark Theory of Hadrons 1
G. Zweig, An SU(3) model for strong interaction symmetry and its breaking · 1980
Earlier work this paper cites.
D. J. Lange, The EvtGen particle decay simulation package
2001
Earlier work this paper cites.
Geant4 collaboration, S. Agostinelli et al
2003
Earlier work this paper cites.
D. Ebert, R. N. Faustov, and V. O. Galkin, Masses of heavy baryons in the relativistic quark model
2005
Earlier work this paper cites.
T. Sjöstrand, S. Mrenna, and P. Skands, PYTHIA 6.4 physics and manual
2006
Earlier work this paper cites.
P. Golonka and Z. Was, PHOTOS Monte Carlo: A precision tool for QED corrections in Z Z and W W decays
2006
Earlier work this paper cites.
Geant4 collaboration, J. Allison et al
2006
Earlier work this paper cites.
CDF collaboration, T. Aaltonen et al
Original
2007
Earlier work this paper cites.
D0 collaboration, V. Abazov et al
Original
2007
Earlier work this paper cites.
Belle collaboration, R. Mizuk et al
2007
Earlier work this paper cites.
X. Liu et al
Original
2008
Earlier work this paper cites.
E. E. Jenkins, Model-independent bottom baryon mass predictions in the 1 / N c 1/N_{c} expansion
Original
2008
Earlier work this paper cites.