Azimuthal correlations in Z +jets events in proton–proton collisions at $$\sqrt{s} = 13\,\text {Te}\hspace{-.08em}\text {V} $$

Abstract

AbstractThe production of Z bosons associated with jets is measured in $$\text {p}\text {p}$$<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mtext>pp</mml:mtext> </mml:math> collisions at $$\sqrt{s}=13\,\text {Te}\hspace{-.08em}\text {V} $$<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> <mml:mspace/> <mml:mtext>Te</mml:mtext> <mml:mspace/> <mml:mtext>V</mml:mtext> </mml:mrow> </mml:math> with data recorded with the CMS experiment at the LHC corresponding to an integrated luminosity of 36.3$$\,\text {fb}^{-1}$$<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mspace/> <mml:msup> <mml:mtext>fb</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math>. The multiplicity of jets with transverse momentum $$p_{\textrm{T}} &gt; 30\,\text {Ge}\hspace{-.08em}\text {V} $$<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> <mml:mo>&gt;</mml:mo> <mml:mn>30</mml:mn> <mml:mspace/> <mml:mtext>Ge</mml:mtext> <mml:mspace/> <mml:mtext>V</mml:mtext> </mml:mrow> </mml:math> is measured for different regions of the Z boson’s $$p_{\textrm{T}} (\text {Z })$$<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:mtext>Z</mml:mtext> <mml:mspace/> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math>, from lower than 10$$\,\text {Ge}\hspace{-.08em}\text {V}$$<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mspace/> <mml:mtext>Ge</mml:mtext> <mml:mspace/> <mml:mtext>V</mml:mtext> </mml:mrow> </mml:math> to higher than 100$$\,\text {Ge}\hspace{-.08em}\text {V}$$<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mspace/> <mml:mtext>Ge</mml:mtext> <mml:mspace/> <mml:mtext>V</mml:mtext> </mml:mrow> </mml:math>. The azimuthal correlation $$\varDelta \phi $$<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>Δ</mml:mi> <mml:mi>ϕ</mml:mi> </mml:mrow> </mml:math> between the Z boson and the leading jet, as well as the correlations between the two leading jets are measured in three regions of $$p_{\textrm{T}} (\text {Z })$$<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:mtext>Z</mml:mtext> <mml:mspace/> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math>. The measurements are compared with several predictions at leading and next-to-leading orders, interfaced with parton showers. Predictions based on transverse-momentum dependent parton distributions and corresponding parton showers give a good description of the measurement in the regions where multiple parton interactions and higher jet multiplicities are not important. The effects of multiple parton interactions are shown to be important to correctly describe the measured spectra in the low $$p_{\textrm{T}} (\text {Z })$$<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:mtext>Z</mml:mtext> <mml:mspace/> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math> regions.