Search for the doubly heavy $$ {\Xi}_{bc}^0 $$ baryon via decays to D0pK−



Aaij, R, Abellán Beteta, C, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S
et al (show 987 more authors) (2020) Search for the doubly heavy $$ {\Xi}_{bc}^0 $$ baryon via decays to D0pK−. Journal of High Energy Physics, 2020 (11).

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>A search for the doubly heavy <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\Xi}_{bc}^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>bc</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> baryon using its decay to the <jats:italic>D</jats:italic><jats:sup>0</jats:sup><jats:italic>pK</jats:italic><jats:sup><jats:italic>–</jats:italic></jats:sup> final state is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the LHCb experiment between 2016 and 2018, corresponding to an integrated luminosity of 5.4 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup>. No significant signal is found in the invariant mass range from 6.7 to 7.2 GeV/<jats:italic>c</jats:italic><jats:sup>2</jats:sup>. Upper limits are set at 95% credibility level on the ratio of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\Xi}_{bc}^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>bc</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> production cross-section times its branching fraction to <jats:italic>D</jats:italic><jats:sup>0</jats:sup><jats:italic>pK</jats:italic><jats:sup><jats:italic>−</jats:italic></jats:sup> relative to that of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\Lambda}_b^0\to {D}^0{pK}^{-} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Λ</mml:mi> <mml:mi>b</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:msup> <mml:mi>pK</mml:mi> <mml:mo>−</mml:mo> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> decay. The limits are set as a function of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\Xi}_{bc}^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>bc</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> mass and lifetime hypotheses, in the rapidity range from 2.0 to 4.5 and in the transverse momentum region from 5 to 25 GeV/<jats:italic>c</jats:italic>. Upper limits range from 1<jats:italic>.</jats:italic>7 <jats:italic>×</jats:italic> 10<jats:sup><jats:italic>−</jats:italic>2</jats:sup> to 3<jats:italic>.</jats:italic>0 <jats:italic>×</jats:italic> 10<jats:sup><jats:italic>−</jats:italic>1</jats:sup> for the considered <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\Xi}_{bc}^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>bc</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> mass and lifetime hypotheses.</jats:p>

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 24 Feb 2021 15:15
Last Modified: 19 Oct 2021 22:10
DOI: 10.1007/jhep11(2020)095
Open Access URL: https://link.springer.com/content/pdf/10.1007/JHEP...
URI: https://livrepository.liverpool.ac.uk/id/eprint/3116044