Observation of the semileptonic decay $$ {B}^{+}\to p\overline{p}{\mu}^{+}{\nu}_{\mu } $$



Aaij, R, Abellán Beteta, C, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S
et al (show 896 more authors) (2020) Observation of the semileptonic decay $$ {B}^{+}\to p\overline{p}{\mu}^{+}{\nu}_{\mu } $$. Journal of High Energy Physics, 2020 (3).

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>The Cabibbo-suppressed semileptonic decay <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {B}^{+}\to p\overline{p}{\mu}^{+}{\nu}_{\mu } $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>B</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:mi>p</mml:mi> <mml:mover> <mml:mi>p</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msub> <mml:mi>ν</mml:mi> <mml:mi>μ</mml:mi> </mml:msub> </mml:math></jats:alternatives></jats:inline-formula> is observed for the first time using a sample of <jats:italic>pp</jats:italic> collisions corresponding to an integrated luminosity of 1.0, 2.0 and 1.7 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup> at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The differential branching fraction is measured as a function of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ p\overline{p} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>p</mml:mi> <mml:mover> <mml:mi>p</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula> invariant mass using the decay mode <jats:italic>B</jats:italic><jats:sup>+</jats:sup><jats:italic>→ J/ψK</jats:italic><jats:sup>+</jats:sup> for normalisation. The total branching fraction is measured to be</jats:p><jats:p><jats:inline-formula><jats:alternatives><jats:tex-math>$$ \mathrm{\mathcal{B}}\left({B}^{+}\to p\overline{p}{\mu}^{+}{\nu}_{\mu}\right)=\left({5.27}_{-0.24}^{+0.23}\pm 0.21\pm 0.15\right)\times {10}^{-6}, $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <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>p</mml:mi> <mml:mover> <mml:mi>p</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msub> <mml:mi>ν</mml:mi> <mml:mi>μ</mml:mi> </mml:msub> </mml:mrow> </mml:mfenced> <mml:mo>=</mml:mo> <mml:mfenced> <mml:mrow> <mml:msubsup> <mml:mn>5.27</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.24</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.23</mml:mn> </mml:mrow> </mml:msubsup> <mml:mo>±</mml:mo> <mml:mn>0.21</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.15</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>6</mml:mn> </mml:mrow> </mml:msup> <mml:mo>,</mml:mo> </mml:math></jats:alternatives></jats:inline-formula></jats:p><jats:p>where the first uncertainty is statistical, the second systematic and the third is from the uncertainty on the branching fraction of the normalisation channel.</jats:p>

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 06 May 2020 10:04
Last Modified: 28 Nov 2021 08:25
DOI: 10.1007/jhep03(2020)146
Open Access URL: https://link.springer.com/content/pdf/10.1007/JHEP...
URI: https://livrepository.liverpool.ac.uk/id/eprint/3086092