Measurement of the $$ {B}_s^0 $$ → μμ effective lifetime with the ATLAS detector



Aad, G, Abbott, B, Abeling, K, Abicht, NJ, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS
et al (show 2935 more authors) (2023) Measurement of the $$ {B}_s^0 $$ → μμ effective lifetime with the ATLAS detector. Journal of High Energy Physics, 2023 (9). 199-.

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>This paper reports the first ATLAS measurement of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {B}_s^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula><jats:italic>→ μμ</jats:italic> effective lifetime. The measurement is based on the data collected in 2015–2016, amounting to 26.3 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup> of 13 TeV LHC proton-proton collisions. The proper decay-time distribution of 58 ± 13 background-subtracted signal candidates is fit with simulated signal templates parameterised as a function of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {B}_s^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> effective lifetime, with statistical uncertainties extracted through a Neyman construction. The resulting effective measurement of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {B}_s^0 $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula><jats:italic>→ μμ</jats:italic> lifetime is <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {0.99}_{-0.07}^{+0.42} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mn>0.99</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.07</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.42</mml:mn> </mml:mrow> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> (stat.) <jats:italic>±</jats:italic> 0<jats:italic>.</jats:italic>17 (syst.) ps and it is found to be consistent with the Standard Model.</jats:p>

Item Type: Article
Uncontrolled Keywords: Bioengineering
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 16 Feb 2024 09:33
Last Modified: 18 Mar 2024 03:34
DOI: 10.1007/jhep09(2023)199
Open Access URL: https://link.springer.com/article/10.1007/JHEP09(2...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3178725