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Spectroscopy of doubly-heavy baryons at LHCb

The LHCb detector is ideally designed for studies in hadron spectroscopy. Its capabilities in this area of physics was firmly demonstrated when LHCb announced the discovery of the first ever doubly heavy baryon, $\Xi^{++}_{cc}$, in decays of $\Xi^{++}_{cc} \rightarrow \Lambda^{+}_{c} K^{-} \pi^{+} \...

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Autor principal: Traill, Murdo Thomas
Lenguaje:eng
Publicado: SISSA 2018
Materias:
Acceso en línea:https://dx.doi.org/10.22323/1.310.0067
http://cds.cern.ch/record/2672515
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author Traill, Murdo Thomas
author_facet Traill, Murdo Thomas
author_sort Traill, Murdo Thomas
collection CERN
description The LHCb detector is ideally designed for studies in hadron spectroscopy. Its capabilities in this area of physics was firmly demonstrated when LHCb announced the discovery of the first ever doubly heavy baryon, $\Xi^{++}_{cc}$, in decays of $\Xi^{++}_{cc} \rightarrow \Lambda^{+}_{c} K^{-} \pi^{+} \pi^{+}$ in 2017. This doubly charmed baryon was observed as a highly significant structure in the $\Lambda^{+}_{c} K^{-} \pi^{+} \pi^{+}$ mass spectrum from proton-proton collision data recorded by the LHCb detector at both 13 TeV and 8 TeV centre-of-mass energies. From the 13 TeV and 8 TeV samples, a yield of 313 $\pm$ 33 and 113 $\pm$ 21 $\Xi^{++}_{cc}$ candidates are measured respectively. The local significances is in excess of 12$\sigma$ in 13 TeV data and above 7$\sigma$ in 8 TeV data. The properties of the peak suggest it is inconsistent with being a strongly decaying state. From the 13 TeV data, the mass is measured to be 3621.40$\pm$ 0.72(stat.)$\pm$ 0.27(syst.)$\pm$ 0.14($\Lambda^{+}_{c}$) MeV/$c^{2}$. More analyses in the double heavy baryon sector using LHCb data are now well advanced. This includes, but is not limited to, searches for the singly charged $\Xi^{+}_{cc}$ state and also charmed-beauty $\Xi_{bc}$ baryons.
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institution Organización Europea para la Investigación Nuclear
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publishDate 2018
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spelling oai-inspirehep.net-16651072019-10-15T15:28:35Zdoi:10.22323/1.310.0067http://cds.cern.ch/record/2672515engTraill, Murdo ThomasSpectroscopy of doubly-heavy baryons at LHCbParticle Physics - ExperimentThe LHCb detector is ideally designed for studies in hadron spectroscopy. Its capabilities in this area of physics was firmly demonstrated when LHCb announced the discovery of the first ever doubly heavy baryon, $\Xi^{++}_{cc}$, in decays of $\Xi^{++}_{cc} \rightarrow \Lambda^{+}_{c} K^{-} \pi^{+} \pi^{+}$ in 2017. This doubly charmed baryon was observed as a highly significant structure in the $\Lambda^{+}_{c} K^{-} \pi^{+} \pi^{+}$ mass spectrum from proton-proton collision data recorded by the LHCb detector at both 13 TeV and 8 TeV centre-of-mass energies. From the 13 TeV and 8 TeV samples, a yield of 313 $\pm$ 33 and 113 $\pm$ 21 $\Xi^{++}_{cc}$ candidates are measured respectively. The local significances is in excess of 12$\sigma$ in 13 TeV data and above 7$\sigma$ in 8 TeV data. The properties of the peak suggest it is inconsistent with being a strongly decaying state. From the 13 TeV data, the mass is measured to be 3621.40$\pm$ 0.72(stat.)$\pm$ 0.27(syst.)$\pm$ 0.14($\Lambda^{+}_{c}$) MeV/$c^{2}$. More analyses in the double heavy baryon sector using LHCb data are now well advanced. This includes, but is not limited to, searches for the singly charged $\Xi^{+}_{cc}$ state and also charmed-beauty $\Xi_{bc}$ baryons.SISSAoai:inspirehep.net:16651072018
spellingShingle Particle Physics - Experiment
Traill, Murdo Thomas
Spectroscopy of doubly-heavy baryons at LHCb
title Spectroscopy of doubly-heavy baryons at LHCb
title_full Spectroscopy of doubly-heavy baryons at LHCb
title_fullStr Spectroscopy of doubly-heavy baryons at LHCb
title_full_unstemmed Spectroscopy of doubly-heavy baryons at LHCb
title_short Spectroscopy of doubly-heavy baryons at LHCb
title_sort spectroscopy of doubly-heavy baryons at lhcb
topic Particle Physics - Experiment
url https://dx.doi.org/10.22323/1.310.0067
http://cds.cern.ch/record/2672515
work_keys_str_mv AT traillmurdothomas spectroscopyofdoublyheavybaryonsatlhcb