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NNLO QCD corrections in full colour for jet production observables at the LHC
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abstract
Calculations for processes involving a high multiplicity of coloured particles often employ a leading colour approximation, where only the leading terms in the expansion of the number of colours $N_c$ and the number of flavours $n_f$ are retained. This approximation of the full colour result is motivated by the $1/N_c^2$ suppression of the first subleading terms and by the increasing complexity of including subleading colour contributions to the calculation. In this work, we present the calculations using the antenna subtraction method in the NNLOJET framework for the NNLO QCD corrections at full colour for several jet observables at the LHC. The single jet inclusive cross section is calculated doubly differential in transverse momentum and absolute rapidity and compared with the CMS measurement at 13 TeV. A calculation for dijet production doubly differential in dijet mass and rapidity difference is also performed and compared with the ATLAS 7 TeV data. Lastly, a triply differential dijet cross section in average transverse momentum, rapidity separation and dijet system boost is calculated and compared with the CMS 8 TeV data. The impact of the subleading colour contributions to the leading colour approximation is assessed in detail for all three types of observables and as a function of the jet cone size. The subleading colour contributions play a potentially sizable role in the description of the triply differential distributions, which probe kinematical configurations that are not easily accessed by any of the other observables.
Forward citations
Cited by 7 Pith papers
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Dissecting Exclusive Multijet Cross Sections
A general leading-power factorization framework for exclusive multijet resolution variables, with a new rapidity regulator and an all-order factorizing k_T-ness variable.
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Impact of Z-boson transverse-momentum resummation on PDF determination
N3LL' resummation is required to reconcile the 13 TeV ATLAS Z-pT spectrum with global PDF fits, but lowering the pT cut below 30 GeV is not yet supported.
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The Quark Jet Function for $k_T$-like Variables in NNLO QCD
The authors compute the quark jet function at next-to-next-to-leading order in QCD for a class of kT-like resolution variables, giving explicit numerical coefficients for a y23 variant in the E-scheme and WTA scheme.
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Precise Determination of the Strong Coupling Constant from Dijet Cross Sections up to the Multi-TeV Range
A complete NNLO QCD fit to LHC and HERA dijet data yields alpha_s(m_Z) = 0.1178 with a total uncertainty of 0.0022 and tests the running coupling from 7 GeV up to 7 TeV.
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Determination of the strong coupling and its running from measurements of inclusive jet production
A NNLO QCD fit to CMS inclusive jet cross sections at 2.76, 7, 8 and 13 TeV plus HERA DIS yields alphaS(mZ) = 0.1176 (+0.0014, -0.0016) and confirms the predicted running of the strong coupling up to 1.6 TeV.
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The impact of LHC precision measurements of inclusive jet and dijet production on the CTEQ-TEA global PDF fit
New LHC inclusive jet data push the CT18 gluon harder at high x and shrink its uncertainty, while dijet data show stronger scale dependence and are set aside.
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Global analyses of helicity-dependent parton distribution functions
Modern global QCD analyses agree that up-quark helicity is positive and down-quark helicity negative, with positive gluon polarisation at moderate x, while the full gluon spin moment remains limited by the unmeasured ...
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