Measurements of normalized differential cross sections for $t\bar{t}$ production in pp collisions at $\sqrt{s}=7$ TeV using the ATLAS detector
(2014) Physical review D — Vol. 90 (2014)
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- <p>Measurements of normalized differential cross sections for top-quark pair production are presented as a function of the top-quark transverse momentum, and of the mass, transverse momentum, and rapidity of the <inline-formula><mml:math display="inline"><mml:mi>t</mml:mi><mml:mover accent="true"><mml:mi>t</mml:mi><mml:mo accent="true" stretchy="false">¯</mml:mo></mml:mover></mml:math></inline-formula> system, in proton–proton collisions at a center-of-mass energy of <inline-formula><mml:math display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>7</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:mrow></mml:math></inline-formula>. The data set corresponds to an integrated luminosity of <inline-formula><mml:math display="inline"><mml:mrow><mml:mn>4.6</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:msup><mml:mrow><mml:mi>fb</mml:mi></mml:mrow><mml:mrow><mml:mo>-</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math></inline-formula>, marc:recorded in 2011 with the ATLAS detector at the CERN Large Hadron Collider. Events are selected in the <inline-formula><mml:math display="inline"><mml:mrow><mml:mi>lepton</mml:mi><mml:mo>+</mml:mo><mml:mtext>jets</mml:mtext></mml:mrow></mml:math></inline-formula> channel, requiring exactly one lepton and at least four jets with at least one of the jets tagged as originating from a <inline-formula><mml:math display="inline"><mml:mi>b</mml:mi></mml:math></inline-formula>-quark. The measured spectra are corrected for detector efficiency and resolution effects and are compared to several Monte Carlo simulations and theory calculations. The results are in fair agreement with the predictions in a wide kinematic range. Nevertheless, data distributions are softer than predicted for higher values of the mass of the <inline-formula><mml:math display="inline"><mml:mi>t</mml:mi><mml:mover accent="true"><mml:mi>t</mml:mi><mml:mo accent="true" stretchy="false">¯</mml:mo></mml:mover></mml:math></inline-formula> system and of the top-quark transverse momentum. The measurements can also discriminate among different sets of parton distribution functions.</p>
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Tanasijczuk, A. J., ATLAS, & et al. (2014). Measurements of normalized differential cross sections for $t\bar{t}$ production in pp collisions at $\sqrt{s}=7$ TeV using the ATLAS detector. Physical review D, 90. https://doi.org/10.1103/PhysRevD.90.072004 (Original work published 2014)