Angular distribution study for high mass dimuon pairs in CMS open 2012 data and for mono-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi mathvariant="normal">Z</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math> model

Abstract

This analysis uses the Compact Muon Solenoid (CMS) open data to study the angular distribution of high mass dimuon pairs produced during proton-proton interaction at a center of mass energy of 8 TeV. The study uses the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>cos</a:mi><a:msub><a:mrow><a:mi>θ</a:mi></a:mrow><a:mrow><a:mi>CS</a:mi></a:mrow></a:msub></a:mrow></a:math> variable defined in the Collins-Soper frame. In the Standard Model (SM), the production of high mass dimuon pairs is dominated by the Drell-Yan process, which exhibits a strong forward-backward asymmetry. However, many scenarios beyond the SM predict different shapes for the <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mrow><c:mi>cos</c:mi><c:msub><c:mrow><c:mi>θ</c:mi></c:mrow><c:mrow><c:mi>CS</c:mi></c:mrow></c:msub></c:mrow></c:math> distribution. In excess events beyond the SM, the angular distribution can be used to distinguish between those models. The mono-<e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:msup><e:mi mathvariant="normal">Z</e:mi><e:mo>′</e:mo></e:msup></e:math> model has been used to interpret the data, and no deviation from the SM has been observed.