Observation of the doubly charmed baryon decay Xi(++)(cc) -> Xi(c)'(+)pi(+)



Aaij, R, Abdelmotteleb, ASW, Abellan Beteta, C, Abudinen, F, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Agapopoulou, C, Aidala, CA
et al (show 998 more authors) (2022) Observation of the doubly charmed baryon decay Xi(++)(cc) -> Xi(c)'(+)pi(+). JOURNAL OF HIGH ENERGY PHYSICS, 2022 (5).

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>The <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\varXi}_{cc}^{++}\to {\varXi}_c^{\prime +}{\pi}^{+} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>cc</mml:mi> <mml:mrow> <mml:mo>+</mml:mo> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mrow> <mml:mo>′</mml:mo> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> decay is observed using proton-proton collisions collected by the LHCb experiment at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5<jats:italic>.</jats:italic>4 fb<jats:italic>−</jats:italic>1. The <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\varXi}_{cc}^{++}\to {\varXi}_c^{\prime +}{\pi}^{+} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>cc</mml:mi> <mml:mrow> <mml:mo>+</mml:mo> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mrow> <mml:mo>′</mml:mo> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:math></jats:alternatives></jats:inline-formula> decay is reconstructed partially, where the photon from the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\varXi}_c^{\prime +}\to {\varXi}_c^{+}\gamma $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mrow> <mml:mo>′</mml:mo> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> <mml:mi>γ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> decay is not reconstructed and the <jats:italic>pK</jats:italic><jats:sup><jats:italic>−</jats:italic></jats:sup><jats:italic>π</jats:italic><jats:sup>+</jats:sup> final state of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\varXi}_c^{+} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> baryon is employed. The <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\varXi}_{cc}^{++}\to {\varXi}_c^{\prime +}{\pi}^{+} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>cc</mml:mi> <mml:mrow> <mml:mo>+</mml:mo> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mrow> <mml:mo>′</mml:mo> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mspace /> </mml:math></jats:alternatives></jats:inline-formula>branching fraction relative to that of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\varXi}_{cc}^{++}\to {\varXi}_c^{+}{\pi}^{+} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>cc</mml:mi> <mml:mrow> <mml:mo>+</mml:mo> <mml:mo>+</mml:mo> </mml:mrow> </mml:msubsup> <mml:mo>→</mml:mo> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mspace /> </mml:math></jats:alternatives></jats:inline-formula> decay is measured to be 1<jats:italic>.</jats:italic>41 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>17 <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>10, where the first uncertainty is statistical and the second systematic.</jats:p>

Item Type: Article
Uncontrolled Keywords: Charm Physics, Flavour Physics, Hadron-Hadron Scattering, Proton-Proton Scattering
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 31 Aug 2022 10:17
Last Modified: 18 Jan 2023 20:46
DOI: 10.1007/JHEP05(2022)038
Open Access URL: https://link.springer.com/content/pdf/10.1007/JHEP...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3162853