“The more accurate the #statistics have become at the #LHC, the better they match the #StandardModel”
That’s an incredible win right there, and also, a null result can be just as helpful as a new discovery.
https://www.quantamagazine.org/is-particle-physics-dead-dying-or-just-hard-20260126/
A measurement of the fiducial cross section of the associated production of a Z boson and a high-$ p_{\mathrm{T}} $ photon, where the Z decays to two neutrinos, and a search for anomalous triple gauge couplings are reported. The results are based on data collected by the CMS experiment at the LHC in proton-proton collisions at $ \sqrt{s}= $ 13 TeV during 2016--2018, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. The fiducial $ \mathrm{Z}\gamma $ cross section, where a photon with a $ p_{\mathrm{T}} $ greater than 225 GeV is produced in association with a Z, and the Z decays to a $ \nu\overline{\nu} $ pair ($ \mathrm{Z}(\nu\overline{\nu})\gamma $), is measured to be 23.3 $ ^{+1.4}_{-1.3} $ fb, in agreement, within uncertainties, with the standard model prediction. The differential cross section as a function of the photon $ p_{\mathrm{T}} $ has been measured and compared with standard model predictions computed at next-to-leading and at next-to-next-to-leading order in perturbative quantum chromodynamics. Constraints have been placed on the presence of anomalous couplings that affect the $ \mathrm{Z}\mathrm{Z}\gamma $ and $ \mathrm{Z}\gamma\gamma $ vertex using the $ p_{\mathrm{T}} $ spectrum of the photons. The observed 95% confidence level intervals for $ CP $-conserving $ h_3^{\gamma} $ and $ h_4^{\gamma} $ are determined to be (-3.4, 3.5)$ \times10^{-4} $ and (-6.8, 6.8)$ \times10^{-7} $, and for $ h_3^{\mathrm{Z}} $ and $ h_4^{\mathrm{Z}} $ they are (-2.2, 2.2)$ \times10^{-4} $ and (-4.1, 4.2)$ \times10^{-7} $, respectively. These are the strictest limits to date on $ h_3^{\gamma} $, $ h_3^{\mathrm{Z}} $ and $ h_4^{\mathrm{Z}} $.
As #2025 ends, the #StandardModel still hasn’t #Cracked : Medium
How a #PhD is like riding a #Bike : Science
What’s the Most #Distant #Galaxy? And Why Does It #Matter? : Sci Am
Latest #KnowledgeLinks
A measurement of the Z$ \gamma $ production cross section in proton-proton collisions at a center-of-mass energy of 13.6 TeV is presented. Data corresponding to an integrated luminosity of 34.8 fb$^{-1}$, collected by the CMS experiment at the LHC in 2022 are used. Events with an oppositely charged pair of muons or electrons, with an invariant mass corresponding to a Z boson, together with an isolated photon are selected. The measured fiducial cross section for the combined electron and muon channels is 1.896 $ \pm $ 0.033 (stat) $ \pm $ 0.054 (syst) $ \pm $ 0.006 (theo) pb, in agreement with the standard model prediction of 1.922 $ \pm $ 0.094 pb. Constraints on neutral triple gauge couplings generated by dimension-8 operators in a recently proposed effective field theory framework are determined for the first time.
Discover how quarks, leptons, and the forces of the universe shape modern nuclear science—from the structure of protons and neutrons to nuclear energy, medical imaging, neutrino monitoring, particle accelerators, and stellar nucleosynthesis.
Read full article here: https://youtu.be/08xTgEgc4Eo
#quartz #leptons #nuclearscience #particlephysics #StandardModel #NuclearEnergy #astrophysics #scienceeducation
The first observation of electroweak production of a photon in association with two forward jets in proton-proton collisions is presented. The measurement uses data recorded by the CMS experiment at the LHC during 2016-2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. The analysis is performed in a region enriched in photon production via vector boson fusion, with a requirement on the transverse momentum of the photon to exceed 200 GeV. The cross section is measured to be 202$ ^{+36}_{-32} $ fb, at a significance with respect to the null hypothesis that exceeds five standard deviations. This is in agreement with the standard model prediction of 177$ ^{+13}_{-12} $ fb. Differential cross sections are measured as a function of various observables. Limits are set on dimension-6 effective field theory operators that contribute to the WW$ \gamma $ interaction. The observed 95% confidence intervals for the corresponding Warsaw basis Wilson coefficients $ c_{\mathrm{W}} $ and $ c_{\mathrm{H}\mathrm{W}\mathrm{B}} $ are [$-$0.11, 0.16] and [$-$1.6, 1.5], respectively.
Future Circular Collider (FCC): CERN Council reviews Feasibility Study
The quest for the answers to the open questions (such as, which fundamentalparticles make dark matter, why matter dominates the universe and why...........
#CERN #FCC #FutureCircularCollider #LargeHadronCollider #Muoncollider #Particleaccelerators #Standardmodel
Umesh Prasad
Timo Kissel
CMS Publications
Knowledge Zone
MUDASSAR SALEEM
Umesh Prasad