Observation of the B+ → Jψη′K+ decay



Aaij, R, Abdelmotteleb, ASW, Abellan Beteta, C, Abudinén, F, Ackernley, T, Adeva, B, Adinolfi, M, Adlarson, P, Afsharnia, H, Agapopoulou, C
et al (show 1058 more authors) (2023) Observation of the B+ → Jψη′K+ decay. Journal of High Energy Physics, 2023 (8).

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>The <jats:italic>B</jats:italic><jats:sup>+</jats:sup> → <jats:italic>Jψη</jats:italic>′<jats:italic>K</jats:italic><jats:sup>+</jats:sup> decay is observed for the first time using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup>. The branching fraction of this decay is measured relative to the known branching fraction of the <jats:italic>B</jats:italic><jats:sup>+</jats:sup> → <jats:italic>ψ</jats:italic>(2<jats:italic>S</jats:italic>)<jats:italic>K</jats:italic><jats:sup>+</jats:sup> decay and found to be<jats:disp-formula><jats:alternatives><jats:tex-math>$$ \frac{\mathcal{B}\left({B}^{+}\to {J\psi \eta}^{\prime }{K}^{+}\right)}{\mathcal{B}\left({B}^{+}\to \psi (2S){K}^{+}\right)}=\left(4.91\pm 0.47\pm 0.29\pm 0.07\right)\times {10}^{-2}, $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfrac> <mml:mrow> <mml:mi>B</mml:mi> <mml:mfenced> <mml:mrow> <mml:msup> <mml:mi>B</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>Jψη</mml:mi> <mml:mo>′</mml:mo> </mml:msup> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:mrow> </mml:mfenced> </mml:mrow> <mml:mrow> <mml:mi>B</mml:mi> <mml:mfenced> <mml:mrow> <mml:msup> <mml:mi>B</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>ψ</mml:mi> <mml:mfenced> <mml:mrow> <mml:mn>2</mml:mn> <mml:mi>S</mml:mi> </mml:mrow> </mml:mfenced> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:mrow> </mml:mfenced> </mml:mrow> </mml:mfrac> <mml:mo>=</mml:mo> <mml:mfenced> <mml:mrow> <mml:mn>4.91</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.47</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.29</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.07</mml:mn> </mml:mrow> </mml:mfenced> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:msup> <mml:mo>,</mml:mo> </mml:math></jats:alternatives></jats:disp-formula></jats:p><jats:p>where the first uncertainty is statistical, the second is systematic and the third is related to external branching fractions. A first look at the <jats:italic>J/ψη</jats:italic>′ mass distribution is performed and no signal of intermediate resonances is observed.</jats:p>

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 18 Sep 2023 07:56
Last Modified: 18 Sep 2023 07:56
DOI: 10.1007/jhep08(2023)174
Open Access URL: https://link.springer.com/content/pdf/10.1007/JHEP...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3172827