An angular analysis of the $B_s^0 \\to \\phi e^+ e^-$ decay is performed using the proton-proton collision dataset collected between 2011 and 2018 by the LHCb experiment, corresponding to an integrated luminosity of $9~\\text{fb}^{-1}$ at centre-of-mass energies of $7$, $8$, and $13~\\text{TeV}$.<\/p>\n
The analysis is performed in the very low dielectron invariant mass-squared region between<\/p>\n
$0.0009~\\text{GeV}^2\/c^4 \\quad \\text{and} \\quad 0.2615~\\text{GeV}^2\/c^4.$<\/p>\n
The longitudinal polarisation fraction of the $\\phi$ meson is measured to be less than $11.5\\%$ at $90\\%$ confidence level. The \\texttt{AReCPT} observable, which is related to the lepton forward-backward asymmetry, is measured to be<\/p>\n
$0.116 \\pm 0.155 \\pm 0.006,$<\/p>\n
where the first uncertainty is statistical and the second systematic. The transverse asymmetries, $A^{(2)}_T$ and $A_{\\text{ImCPT}}$, which are sensitive to the virtual photon polarisation, are found to be<\/p>\n
$A^{(2)}_T = -0.045 \\pm 0.235 \\pm 0.014 \\quad \\text{and} \\quad A_{\\text{ImCPT}} = 0.002 \\pm 0.247 \\pm 0.016,$<\/p>\n
respectively. The results are consistent with Standard Model predictions.<\/p>\n","protected":false},"excerpt":{"rendered":"
An angular analysis of the $B_s^0 \\to \\phi e^+ e^-$ decay is performed using the proton-proton collision dataset collected between 2011 and 2018 by the LHCb experiment, corresponding to an integrated luminosity of $9~\\text{fb}^{-1}$ at centre-of-mass energies of $7$, $8$, and $13~\\text{TeV}$. The analysis is performed in the very low dielectron invariant mass-squared region between $0.0009~\\text{GeV}^2\/c^4 \\quad \\text{and} \\quad 0.2615~\\text{GeV}^2\/c^4.$ The longitudinal polarisation fraction of the $\\phi$ meson is measured […]<\/p>\n","protected":false},"author":12,"featured_media":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"publication-type":[30],"class_list":["post-32497","publication","type-publication","status-publish","hentry","publication-type-article"],"acf":[],"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication\/32497","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication"}],"about":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/types\/publication"}],"author":[{"embeddable":true,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/users\/12"}],"version-history":[{"count":0,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication\/32497\/revisions"}],"wp:attachment":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/media?parent=32497"}],"wp:term":[{"taxonomy":"publication-type","embeddable":true,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication-type?post=32497"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}