Angular moments of the decay Λ0 b → Λμ+μ− at low hadronic recoil

Media type: E-Article
Title: Angular moments of the decay Λ0 b → Λμ+μ− at low hadronic recoil
Contributor: Aaij, R.; Adeva, B.; Adinolfi, M.; Aidala, C. A.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.; Ali, S.; Alkhazov, G.; Alvarez Cartelle, P.; Alves, A. A.; Amato, S.; Amerio, S.; Amhis, Y.; An, L.; Anderlini, L.; Andreassi, G.; Andreotti, M.; Andrews, J. E.; Appleby, R. B.; [...]
imprint: Springer Science and Business Media LLC, 2018
Published in: Journal of High Energy Physics
Language: English
DOI: 10.1007/jhep09(2018)146
ISSN: 1029-8479
Keywords: Nuclear and High Energy Physics
Origination:
Footnote:
Description: <jats:title>A<jats:sc>bstract</jats:sc></jats:title><jats:p>An analysis of the angular distribution of the decay Λ<jats:sub><jats:italic>b</jats:italic></jats:sub><jats:sup>0</jats:sup> → Λ<jats:italic>μ</jats:italic><jats:sup>+</jats:sup><jats:italic>μ</jats:italic><jats:sup>−</jats:sup>is presented, using data collected with the LHCb detector between 2011 and 2016 and corresponding to an integrated luminosity of approximately 5 fb<jats:sup>−1</jats:sup>. Angular observables are determined using a moment analysis of the angular distribution at low hadronic recoil, corresponding to the dimuon invariant mass squared range 15 <<jats:italic>q</jats:italic><jats:sup>2</jats:sup>< 20 GeV<jats:sup>2</jats:sup>/<jats:italic>c</jats:italic><jats:sup>4</jats:sup>. The full basis of observables is measured for the first time. The lepton-side, hadron-side and combined forward-backward asymmetries of the decay are determined to be<jats:disp-formula><jats:alternatives><jats:tex-math>$$ \begin{array}{l}{A}_{\mathrm{FB}}^{\ell }=-0.39\pm 0.04\left(\mathrm{stat}\right)\pm 0.01\left(\mathrm{syst}\right),\hfill \\ {}{A}_{\mathrm{FB}}^h=-0.30\pm 0.05\left(\mathrm{stat}\right)\pm 0.02\left(\mathrm{syst}\right),\hfill \\ {}{A}_{\mathrm{FB}}^{\ell h}=+0.25\pm 0.04\left(\mathrm{stat}\right)\pm 0.01\left(\mathrm{syst}\right).\hfill \end{array} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mtable><mml:mtr><mml:mtd><mml:msubsup><mml:mi>A</mml:mi><mml:mrow><mml:mi>F</mml:mi><mml:mi>B</mml:mi></mml:mrow><mml:mi>ℓ</mml:mi></mml:msubsup><mml:mo>=</mml:mo><mml:mo>−</mml:mo><mml:mn>0.39</mml:mn><mml:mo>±</mml:mo><mml:mn>0.04</mml:mn><mml:mfenced><mml:mi>stat</mml:mi></mml:mfenced><mml:mo>±</mml:mo><mml:mn>0.01</mml:mn><mml:mfenced><mml:mi>syst</mml:mi></mml:mfenced><mml:mo>,</mml:mo></mml:mtd></mml:mtr><mml:mtr><mml:mtd><mml:msubsup><mml:mi>A</mml:mi><mml:mrow><mml:mi>F</mml:mi><mml:mi>B</mml:mi></mml:mrow><mml:mi>h</mml:mi></mml:msubsup><mml:mo>=</mml:mo><mml:mo>−</mml:mo><mml:mn>0.30</mml:mn><mml:mo>±</mml:mo><mml:mn>0.05</mml:mn><mml:mfenced><mml:mi>stat</mml:mi></mml:mfenced><mml:mo>±</mml:mo><mml:mn>0.02</mml:mn><mml:mfenced><mml:mi>syst</mml:mi></mml:mfenced><mml:mo>,</mml:mo></mml:mtd></mml:mtr><mml:mtr><mml:mtd><mml:msubsup><mml:mi>A</mml:mi><mml:mrow><mml:mi>F</mml:mi><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mi>ℓ</mml:mi><mml:mi>h</mml:mi></mml:mrow></mml:msubsup><mml:mo>=</mml:mo><mml:mo>+</mml:mo><mml:mn>0.25</mml:mn><mml:mo>±</mml:mo><mml:mn>0.04</mml:mn><mml:mfenced><mml:mi>stat</mml:mi></mml:mfenced><mml:mo>±</mml:mo><mml:mn>0.01</mml:mn><mml:mfenced><mml:mi>syst</mml:mi></mml:mfenced><mml:mtext>.</mml:mtext></mml:mtd></mml:mtr></mml:mtable></mml:math></jats:alternatives></jats:disp-formula></jats:p><jats:p>The measurements are consistent with Standard Model predictions.</jats:p>
Access State: Open Access

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