Note: When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external site maintained by the publisher.
Some full text articles may not yet be available without a charge during the embargo (administrative interval).
What is a DOI Number?
Some links on this page may take you to nonfederal websites. Their policies may differ from this site.

A bstract It is wellknown that onshell maximally helicityviolating gluon scattering amplitudes in planar maximally supersymmetric YangMills theory are dual to a bosonic Wilson loop on a nullpolygonal contour. The lightlike nature of the intervals is a reflection of the massshell condition for massless gluons involved in scattering. Presently, we introduce a Wilson loop prototype on a piecewise curvilinear contour that can be interpreted in the Tdual language to correspond to nonvanishing gluon offshellness. We analyze it first for four sites at one loop and demonstrate that it coincides with the fourgluon amplitude on the Coulomb branch. Encouraged by this fact, we move on to the twoloop order. To simplify our considerations, we only focus on the Sudakov asymptotics of the Wilson loop, when the offshellness goes to zero. The latter serves as a regulator of shortdistance divergences around the perimeter of the loop, i.e., divergences when gluons are integrated over a small vicinity of the Wilson loop cusps. It does not however regulate conventional ultraviolet divergences of interior closed loops. This unavoidably introduces a renormalization scale dependence and thus scheme dependence into the problem. With a choice of the scale setting and a finite renormalization, we observe exponentiation of the double logarithmic scaling of the Wilson loop with the accompanying exponent being given by the socalled hexagon anomalous dimension, which recently made its debut in the origin limit of sixleg gluon amplitudes. This is contrary to the expectation for the octagon anomalous dimension to rather emerge from our analysis suggesting that the current object encodes physics different from the Coulomb branch scattering amplitudes.more » « less

Free, publiclyaccessible full text available December 1, 2024

A<sc>bstract</sc> A search for new physics in top quark production with additional finalstate leptons is performed using data collected by the CMS experiment in protonproton collisions at
= 13 TeV at the LHC during 2016–2018. The data set corresponds to an integrated luminosity of 138 fb^{−1}. Using the framework of effective field theory (EFT), potential new physics effects are parametrized in terms of 26 dimensionsix EFT operators. The impacts of EFT operators are incorporated through the eventlevel reweighting of Monte Carlo simulations, which allows for detectorlevel predictions. The events are divided into several categories based on lepton multiplicity, total lepton charge, jet multiplicity, and btagged jet multiplicity. Kinematic variables corresponding to the transverse momentum ($$ \sqrt{s} $$ $\sqrt{s}$p _{T}) of the leading pair of leptons and/or jets as well as thep _{T}of onshell Z bosons are used to extract the 95% confidence intervals of the 26 Wilson coefficients corresponding to these EFT operators. No significant deviation with respect to the standard model prediction is found.Free, publiclyaccessible full text available December 1, 2024 
Free, publiclyaccessible full text available November 1, 2024

Abstract A description is presented of the algorithms used to reconstruct energy deposited in the CMS hadron calorimeter during Run 2 (2015–2018) of the LHC. During Run 2, the characteristic bunchcrossing spacing for protonproton collisions was 25 ns, which resulted in overlapping signals from adjacent crossings. The energy corresponding to a particular bunch crossing of interest is estimated using the known pulse shapes of energy depositions in the calorimeter, which are measured as functions of both energy and time. A variety of algorithms were developed to mitigate the effects of adjacent bunch crossings on local energy reconstruction in the hadron calorimeter in Run 2, and their performance is compared.
Free, publiclyaccessible full text available November 1, 2024 
Free, publiclyaccessible full text available November 1, 2024

Free, publiclyaccessible full text available November 1, 2024

Free, publiclyaccessible full text available November 1, 2024

Abstract A search for decays to invisible particles of Higgs bosons produced in association with a topantitop quark pair or a vector boson, which both decay to a fully hadronic final state, has been performed using protonproton collision data collected at
by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138$${\sqrt{s}=13\,\text {Te}\hspace{.08em}\text {V}}$$ $\sqrt{s}=13\phantom{\rule{0ex}{0ex}}\text{Te}\phantom{\rule{0ex}{0ex}}\text{V}$ . The 95% confidence level upper limit set on the branching fraction of the 125$$\,\text {fb}^{1}$$ $\phantom{\rule{0ex}{0ex}}{\text{fb}}^{1}$ Higgs boson to invisible particles,$$\,\text {Ge}\hspace{.08em}\text {V}$$ $\phantom{\rule{0ex}{0ex}}\text{Ge}\phantom{\rule{0ex}{0ex}}\text{V}$ , is 0.54 (0.39 expected), assuming standard model production cross sections. The results of this analysis are combined with previous$${\mathcal {B}({\textrm{H}} \rightarrow \text {inv})}$$ $B(\text{H}\to \text{inv})$ searches carried out at$${\mathcal {B}({\textrm{H}} \rightarrow \text {inv})}$$ $B(\text{H}\to \text{inv})$ , 8, and 13$${\sqrt{s}=7}$$ $\sqrt{s}=7$ in complementary production modes. The combined upper limit at 95% confidence level on$$\,\text {Te}\hspace{.08em}\text {V}$$ $\phantom{\rule{0ex}{0ex}}\text{Te}\phantom{\rule{0ex}{0ex}}\text{V}$ is 0.15 (0.08 expected).$${\mathcal {B}({\textrm{H}} \rightarrow \text {inv})}$$ $B(\text{H}\to \text{inv})$Free, publiclyaccessible full text available October 1, 2024