#CMSpaper soon on arXiv: Measurement of dijet angular distributions and search for beyond the standard model physics in proton-proton collisions at √s = 13 TeV (CERN-EP-2026-057)
https://cds.cern.ch/record/2957886 #NewPhysics Measurement of dijet angular distributions and search for beyond the standard model physics in proton-proton collisions at $ \sqrt{s} = $ 13 TeV
A measurement is presented of dijet angular distributions in proton-proton collisions at $ \sqrt{s} = $ 13 TeV, using data collected with the CMS detector at the CERN LHC and corresponding to an integrated luminosity of 138 fb$ ^{-1} $. For the first time, the dijet angular distributions, corrected for detector effects, are compared with the predictions of perturbative quantum chromodynamics at next-to-next-to-leading order, including next-to-leading-order electroweak corrections. While data are generally found to be in agreement with predictions, a small difference in shape of the normalized distributions is seen for dijet masses ranging from 2.4 to 4.8 TeV and above 6 TeV. The distributions are used to search for proposed signatures of quark compositeness, extra spatial dimensions, quantum black holes, dark-matter mediators, axion-like particles, and anomalous gluon couplings. The most stringent limits to date are set for most of these scenarios. Quark contact interactions are excluded at 95\% confidence level (CL) up to a scale of 17 (37) TeV for destructive (constructive) interference in a benchmark scenario, valid to next-to-leading order in quantum chromodynamics, and in which only left-handed quarks participate. The coupling of axion-like particles to the gluon, $ c_{\text{g}}/f_{\text{a}} $, is constrained to be lower than 0.42$ \text{TeV}^{-1} $ at 95\% CL. The anomalous triple-gluon coupling, $ C_{\text{G}}/\Lambda^2 $, in a standard model effective field theory is constrained to be lower than 0.0076$ \text{TeV}^{-2} $ at 95% CL
#CMSpaper soon on arXiv: Measurement of dijet angular distributions and search for beyond the standard model physics in proton-proton collisions at √s = 13 TeV (CERN-EP-2026-057)
https://cds.cern.ch/record/2957886 #NewPhysics Measurement of dijet angular distributions and search for beyond the standard model physics in proton-proton collisions at $ \sqrt{s} = $ 13 TeV
A measurement is presented of dijet angular distributions in proton-proton collisions at $ \sqrt{s} = $ 13 TeV, using data collected with the CMS detector at the CERN LHC and corresponding to an integrated luminosity of 138 fb$ ^{-1} $. For the first time, the dijet angular distributions, corrected for detector effects, are compared with the predictions of perturbative quantum chromodynamics at next-to-next-to-leading order, including next-to-leading-order electroweak corrections. While data are generally found to be in agreement with predictions, a small difference in shape of the normalized distributions is seen for dijet masses ranging from 2.4 to 4.8 TeV and above 6 TeV. The distributions are used to search for proposed signatures of quark compositeness, extra spatial dimensions, quantum black holes, dark-matter mediators, axion-like particles, and anomalous gluon couplings. The most stringent limits to date are set for most of these scenarios. Quark contact interactions are excluded at 95\% confidence level (CL) up to a scale of 17 (37) TeV for destructive (constructive) interference in a benchmark scenario, valid to next-to-leading order in quantum chromodynamics, and in which only left-handed quarks participate. The coupling of axion-like particles to the gluon, $ c_{\text{g}}/f_{\text{a}} $, is constrained to be lower than 0.42$ \text{TeV}^{-1} $ at 95\% CL. The anomalous triple-gluon coupling, $ C_{\text{G}}/\Lambda^2 $, in a standard model effective field theory is constrained to be lower than 0.0076$ \text{TeV}^{-2} $ at 95% CL
#CMSpaper soon on arXiv: Search for new particles decaying into top quark-antiquark pairs in proton-proton collisions at √s = 13 TeV (CERN-EP-2026-049)
https://cds.cern.ch/record/2957871 #NewPhysics Search for new particles decaying into top quark-antiquark pairs in proton-proton collisions at $ \sqrt{s} = $ 13 TeV
A search for new particles decaying to top quark-antiquark pairs is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV. The data set recorded with the CMS detector between 2016 and 2018 is used, corresponding to an integrated luminosity of 138 fb$ ^{-1}$. Final states with 0, 1, and 2 leptons are analyzed, covering all decay modes of the top quark-antiquark pairs. Heavy $ \mathrm{Z}^{'} $ bosons with relative widths of 1, 10, and 30\% are excluded for masses in the ranges 0.4-4.8, 0.4-6.2, and 0.4-7.4 TeV, respectively. A Kaluza-Klein gluon in the Randall-Sundrum model and a dark-matter mediator are excluded for masses between 0.5-5.5 and 1.0-4.2 TeV, respectively. These results set the most stringent limits to date for the considered models in the $ \mathrm{t} \overline{\mathrm{t}} $ final state. In addition, in the two-Higgs-doublet models, upper limits are set on the coupling strength modifier for scalar and pseudoscalar Higgs bosons with relative widths of 2.5, 10, and 25\% in the mass range of 0.5-1.0 TeV.
#CMSPAS: Direct evidence of the dead-cone effect in bottom quark initiated jets (CMS-PAS-SMP-25-008)
https://cds.cern.ch/record/2957860 #Moriond #StandardModel #CMSpaper soon on arXiv: Search for low-mass vector and scalar resonances decaying into a quark-antiquark pair in proton-proton collisions at √s = 13 TeV (CERN-EP-2025-213)
https://cds.cern.ch/record/2957811 #NewPhysics Search for low-mass vector and scalar resonances decaying into a quark-antiquark pair in proton-proton collisions at $ \sqrt{s} = $ 13 TeV
A search for resonances with masses from 50 to 300 GeV decaying into a quark-antiquark pair is presented. The search uses proton-proton collision data at $ \sqrt{s}= $ 13 TeV collected by the CMS experiment at the CERN LHC in 2016--2018, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. Two coupling scenarios are considered, with the resonances coupled either equally to all flavors of quarks or preferentially to bottom quarks. The search targets resonances produced in association with hard initial-state radiation, resulting in a large-radius jet with a two-pronged substructure. The PARTICLENET algorithm is used to distinguish resonance decays to bottom quark pairs from lighter quark pairs and to suppress background processes. The invariant jet mass spectrum is scrutinized for peaking excesses over a falling background. No evidence for such resonances is observed. Limits are set on the couplings of new scalar and vector resonances to quarks, representing the most stringent limits to date in the mass range of 50--250 GeV.
#CMSpaper: Search for Higgs boson production at high transverse momentum in the WW decay channel in proton-proton collisions at √s = 13 TeV (arXiv:2603.22233)
https://arxiv.org/abs/2603.22233 #HiggsBoson 
Search for Higgs boson production at high transverse momentum in the WW decay channel in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A search for Higgs boson (\PH) production at high transverse momentum ($p_\mathrm{T}$) in the WW decay channel is presented. The analysis uses proton-proton collisions at $\sqrt{s}$ = 13 TeV recorded by the CMS experiment in 2016$-$2018, corresponding to an integrated luminosity of 138 fb$^{-1}$. The visible decay products of the Higgs boson are reconstructed as a single large-radius jet with one isolated lepton or none (1$\ell$ and 0$\ell$, respectively; $\ell$ = e, $μ$). The \PH-candidate jets are identified using an advanced transformer-based algorithm and are calibrated with the Lund jet plane reweighting technique. The 1$\ell$ channel is further split into gluon fusion, vector boson fusion, and associated production with hadronically decaying vector boson categories, while the 0$\ell$ channel considers all production processes inclusively. The measured cross section times the H $\to$ WW branching fraction relative to the standard model expectation is $μ$ = $-$0.19$^{+0.48}_{-0.46}$, indicating no evidence of a signal above the background. This measurement represents the first dedicated study of highly Lorentz-boosted H $\to$ WW decays, complementing earlier searches for high-$p_\mathrm{T}$ Higgs boson in other decay channels.
#CMSpaper: Measurement of the jet mass in hadronic decays of boosted W bosons at 13 TeV and extraction of the W boson mass (arXiv:2603.19963)
https://arxiv.org/abs/2603.19963 #StandardModel 
Measurement of the jet mass in hadronic decays of boosted W bosons at 13 TeV and extraction of the W boson mass
The jet mass of W bosons decaying to a quark-antiquark pair is measured in W+jets events from proton-proton collisions at a center-of-mass energy of 13 TeV. The data used were collected by the CMS experiment at the CERN LHC and correspond to an integrated luminosity of 138 fb$^{-1}$. Hadronic decays of W bosons with high momenta produce strongly collimated decay products due to the large Lorentz boost, and are reconstructed as single large-radius jets. These jets have a characteristic substructure that is exploited to distinguish them from the large background of quark- and gluon-initiated jets. The jet mass is computed using the soft-drop algorithm, which suppresses soft wide-angle radiation that leads to a broadening of the jet mass distribution. For the first time, unfolded measurements are presented of the double-differential W+jets cross section as a function of the jet transverse momentum and soft-drop mass. From these distributions, the W boson mass is obtained, with a value of 80.83 $\pm$ 0.55 GeV, achieving the smallest uncertainty available today from an all-jets final state at a hadron collider.
#CMSpaper soon on arXiv: Search for Higgs boson production at high transverse momentum in the WW decay channel in proton-proton collisions at √s = 13 TeV (CERN-EP-2026-033)
https://cds.cern.ch/record/2957732 #HiggsBoson Search for Higgs boson production at high transverse momentum in the WW decay channel in proton-proton collisions at $ \sqrt{s} = $ 13 TeV
A search for Higgs boson (H) production at high transverse momentum ($ p_{\mathrm{T}} $) in the WW decay channel is presented. The analysis uses proton-proton collisions at $ \sqrt{s}= $ 13 TeV recorded by the CMS experiment in 2016--2018, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. The visible decay products of the Higgs boson are reconstructed as a single large-radius jet with one isolated lepton or none (1 $ \ell $ and 0 $ \ell $, respectively; $ \ell=\mathrm{e},\mu $). The H-candidate jets are identified using an advanced transformer-based algorithm and are calibrated with the Lund jet plane reweighting technique. The 1 $ \ell $ channel is further split into gluon fusion, vector boson fusion, and associated production with hadronically decaying vector boson categories, while the 0 $ \ell $ channel considers all production processes inclusively. The measured cross section times the $ \mathrm{H} \to \mathrm{W} \mathrm{W} $ branching fraction relative to the standard model expectation is $ \mu = - $ 0.19 $ ^{+0.48}_{-0.46} $, indicating no evidence of a signal above the background. This measurement represents the first dedicated study of highly Lorentz-boosted $ \mathrm{H} \to \mathrm{W} \mathrm{W} $ decays, complementing earlier searches for high-$ p_{\mathrm{T}} $ Higgs boson in other decay channels.
#CMSpaper soon on arXiv: Measurement of the jet mass in hadronic decays of boosted W bosons at 13 TeV and extraction of the W boson mass (CERN-EP-2026-034)
https://cds.cern.ch/record/2957729 #StandardModel Measurement of the jet mass in hadronic decays of boosted W bosons at 13 TeV and extraction of the W boson mass
The jet mass of W bosons decaying to a quark-antiquark pair is measured in W+jets events from proton-proton collisions at a center-of-mass energy of 13 TeV. The data used were collected by the CMS experiment at the CERN LHC and correspond to an integrated luminosity of 138 fb$ ^{-1} $. Hadronic decays of W bosons with high momenta produce strongly collimated decay products due to the large Lorentz boost, and are reconstructed as single large-radius jets. These jets have a characteristic substructure that is exploited to distinguish them from the large background of quark- and gluon-initiated jets. The jet mass is computed using the soft-drop algorithm, which suppresses soft wide-angle radiation that leads to a broadening of the jet mass distribution. For the first time, unfolded measurements are presented of the double-differential W+jets cross section as a function of the jet transverse momentum and soft-drop mass. From these distributions, the W boson mass is obtained, with a value of 80.83 $ \pm $ 0.55 GeV, achieving the smallest uncertainty available today from an all-jets final state at a hadron collider.
#CMSpaper: Measurement of the t-channel single top quark cross section in proton-proton collisions at √s = 5.02 TeV (arXiv:2603.13592)
https://arxiv.org/abs/2603.13592 #TopQuark 
Measurement of the $t$-channel single top quark cross section in proton-proton collisions at $\sqrt{s}$ = 5.02 TeV
The single top quark $t$-channel production cross section is measured in proton-proton collisions at the CERN LHC at $\sqrt{s}$ = 5.02 TeV, using data recorded with the CMS detector in 2017, corresponding to an integrated luminosity of 302 pb$^{-1}$, and resulting in the first CMS measurement of the process at that energy. Events with one electron or muon and two or more jets, among which at least one is identified as originating from a b quark fragmentation, are analyzed. The combined cross section of single top quark (tq) and single top antiquark ($\mathrm{\bar{t}q}$) production is $σ_{\mathrm{tq+\bar{t}q}}$ = 25.4$^{+3.6}_{-3.5}$ (stat) $^{+4.2}_{-3.9}$ (syst) $\pm$ 0.5 (lumi) pb. The individual cross sections are measured to be $σ_{\mathrm{tq}}$ = 17.6$^{+2.8}_{-2.7}$ (stat) $^{+2.6}_{-2.4}$ (syst) $\pm$ 0.3 (lumi) pb and $σ_{\mathrm{\bar{t}q}}$ = 6.6$^{+2.4}_{-1.6}$ (stat) $^{+2.1}_{-2.5}$ (syst) $\pm$ 0.1 (lumi) pb. Their ratio is measured to be $\mathcal{R}_{\mathrm{t-ch}}$ = 2.7$^{+1.5}_{-0.8}$ (stat) $^{+1.3}_{-0.3}$(syst). The absolute value of the Cabibbo$-$Kobayashi$-$Maskawa matrix element is found to be $\lvert f_{\mathrm{LV}}V_\mathrm{tb}\rvert$ = 0.92 $\pm$ 0.09 (exp) $\pm$ 0.01 (thy). The measurements are in good agreement with the standard model predictions at next-to-next-to-leading order accuracy in quantum chromodynamics.
