Measurement of the production cross section for Z+b jets in proton-proton collisions at $\sqrt s$ = 13 TeV
(2022) Physical review D — Vol. 105 (2022)
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- The measurement of the cross section for the production of a <math display="inline"><mi>Z</mi></math> boson, decaying to dielectrons or dimuons, in association with at least one bottom quark jet is performed with proton-proton collision data at <math display="inline"><mrow><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></mrow></math>. The data sample corresponds to an integrated luminosity of <math display="inline"><mrow><mn>137</mn><mtext> </mtext><mtext> </mtext><msup><mrow><mi>fb</mi></mrow><mrow><mo>-</mo><mn>1</mn></mrow></msup></mrow></math>, collected by the CMS experiment at the LHC during 2016–2018. The integrated cross sections for <math display="inline"><mrow><mrow><mi>Z</mi></mrow><mo>+</mo><mo>≥</mo><mn>1</mn><mtext> </mtext><mi>b</mi><mtext> </mtext><mtext>jet</mtext></mrow></math> and <math display="inline"><mrow><mrow><mi>Z</mi></mrow><mo>+</mo><mo>≥</mo><mn>2</mn><mtext> </mtext><mi>b</mi><mtext> </mtext><mrow><mtext>jets</mtext></mrow></mrow></math> are reported for the electron, muon, and combined channels. The fiducial cross sections in the combined channel are <math display="inline"><mrow><mn>6.52</mn><mo>±</mo><mn>0.04</mn><mo stretchy="false">(</mo><mi>stat</mi><mo stretchy="false">)</mo><mo>±</mo><mn>0.40</mn><mo stretchy="false">(</mo><mi>syst</mi><mo stretchy="false">)</mo><mo>±</mo><mn>0.14</mn><mo stretchy="false">(</mo><mi>theo</mi><mo stretchy="false">)</mo><mtext> </mtext><mtext> </mtext><mi>pb</mi></mrow></math> for <math display="inline"><mrow><mrow><mi>Z</mi></mrow><mo>+</mo><mo>≥</mo><mn>1</mn><mtext> </mtext><mi>b</mi><mtext> </mtext><mtext>jet</mtext></mrow></math> and <math display="inline"><mrow><mn>0.65</mn><mo>±</mo><mn>0.03</mn><mrow><mo stretchy="false">(</mo><mi>stat</mi><mo stretchy="false">)</mo></mrow><mo>±</mo><mn>0.07</mn><mrow><mo stretchy="false">(</mo><mi>syst</mi><mo stretchy="false">)</mo></mrow><mo>±</mo><mn>0.02</mn><mrow><mo stretchy="false">(</mo><mi>theo</mi><mo stretchy="false">)</mo></mrow><mtext> </mtext><mtext> </mtext><mi>pb</mi></mrow></math> for <math display="inline"><mrow><mrow><mi>Z</mi></mrow><mo>+</mo><mo>≥</mo><mn>2</mn><mtext> </mtext><mi>b</mi><mtext> </mtext><mrow><mtext>jets</mtext></mrow></mrow></math>. The differential cross section distributions are measured as functions of various kinematic observables that are useful for precision tests of perturbative quantum chromodynamics predictions. The ratios of integrated and differential cross sections for <math display="inline"><mrow><mi>Z</mi></mrow><mo>+</mo><mo>≥</mo><mn>2</mn><mrow><mi>b</mi></mrow><mtext> </mtext><mtext> </mtext><mrow><mtext>jets</mtext></mrow></math> and <math display="inline"><mrow><mrow><mi>Z</mi></mrow><mo>+</mo><mo>≥</mo><mn>1</mn><mtext> </mtext><mi>b</mi><mtext> </mtext><mtext>jet</mtext></mrow></math> processes are also determined. The value of the integrated cross section ratio measured in the combined channel is <math display="inline"><mrow><mn>0.100</mn><mo>±</mo><mn>0.005</mn><mrow><mo stretchy="false">(</mo><mi>stat</mi><mo stretchy="false">)</mo></mrow><mo>±</mo><mn>0.007</mn><mrow><mo stretchy="false">(</mo><mi>syst</mi><mo stretchy="false">)</mo></mrow><mo>±</mo><mn>0.003</mn><mrow><mo stretchy="false">(</mo><mi>theo</mi><mo stretchy="false">)</mo></mrow></mrow></math>. All measurements are compared with predictions from various event generators.
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Citations
Benecke, A., Bethani, A., Bruno, G., Bury, F., Caputo, C., David, P., Delaere, C., Donertas, I. S., Giammanco, A., Jaffel, K., Jain, S., Jain, S., Lemaitre, V., Mondal, K., Prisciandaro, J., Taliercio, A., Teklishyn, M., Tran, T. T., Vischia, P., et al. (2022). Measurement of the production cross section for Z+b jets in proton-proton collisions at $\sqrt s$ = 13 TeV. Physical review D, 105. https://doi.org/10.1103/PhysRevD.105.092014 (Original work published 2022)