Angular analysis of the B0 → K⁎(892)0μ+μ− decay in proton-proton collisions at <math altimg="si1.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>13</mn><mspace width="0.2em"/><mtext>TeV</mtext></math>

Benecke, Anna;Bethani, Agni;Bruno, Giacomo;Caputo, Claudio;CMS;et.al.
(2025) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 864 (2025)

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Abstract
A full set of optimized observables is measured in an angular analysis of the decay <math altimg="si2.svg"><msup><mrow><mi mathvariant="normal">B</mi></mrow><mrow><mn>0</mn></mrow></msup><mo stretchy="false">→</mo><msup><mrow><mi mathvariant="normal">K</mi></mrow><mrow><mo>⁎</mo></mrow></msup><msup><mrow><mo stretchy="false">(</mo><mn>892</mn><mo stretchy="false">)</mo></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mi mathvariant="normal">μ</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msup><msup><mrow><mi mathvariant="normal">μ</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo></mrow></msup></math> using a sample of proton-proton collisions at <math altimg="si3.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>13</mn><mspace width="0.2em"/><mtext>TeV</mtext></math>, collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 140<math altimg="si4.svg"><msup><mrow><mtext>fb</mtext></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>1</mn></mrow></msup></math>. The analysis is performed in six bins of the squared invariant mass of the dimuon system, <math altimg="si5.svg"><msup><mrow><mi>q</mi></mrow><mrow><mn>2</mn></mrow></msup></math>, over the range <math altimg="si6.svg"><mn>1.1</mn><mo linebreak="goodbreak" linebreakstyle="after">&lt;</mo><msup><mrow><mi>q</mi></mrow><mrow><mn>2</mn></mrow></msup><mo linebreak="goodbreak" linebreakstyle="after">&lt;</mo><mn>16</mn><mspace width="0.2em"/><msup><mrow><mtext>GeV</mtext></mrow><mrow><mn>2</mn></mrow></msup></math>. The results are among the most precise experimental measurements of the angular observables for this decay and are compared to a variety of predictions based on the standard model. Some of these predictions exhibit tension with the measurements.
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Benecke, A., Bethani, A., Bruno, G., Caputo, C., de Favereau de Jeneret, J., Delaere, C., Donertas, I. S., Giammanco, A., Guzel, A. O., Jain, S., Lemaitre, V., Lidrych, J., Mastrapasqua, P., Tran, T. T., CMS, & et al. (2025). Angular analysis of the B0 → K⁎(892)0μ+μ− decay in proton-proton collisions at <math altimg=“si1.svg”><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak=“goodbreak” linebreakstyle=“after”>=</mo><mn>13</mn><mspace width=“0.2em”/><mtext>TeV</mtext></math>. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 864. https://doi.org/10.1016/j.physletb.2025.139406 (Original work published 2025)