Notices by Freya Blekman (freyablekman@sciencemastodon.com)

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Freya Blekman (freyablekman@sciencemastodon.com)'s status on Tuesday, 28-Jan-2025 07:42:33 JST Freya Blekman
in reply to
- Stephen Sekula
@steve hi Steve thanks for the compliment. I suggest you read the actual paper ( I queued these posts a while ago so can’t remember any more), after all you’re definitely qualified to do so

In conversation about 3 days ago from sciencemastodon.com permalink
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Freya Blekman (freyablekman@sciencemastodon.com)'s status on Sunday, 26-Jan-2025 21:14:13 JST Freya Blekman

The W and Z bosons, discovered in 1983, are essential for studying the weak force. #CMSPaper 1365 examines simultaneous production of a W and Z boson to test their interactions. Results are compared to the best calculations available, showing only a few percent uncertainty https://buff.ly/3Vx8CAN
In conversation about 4 days ago from sciencemastodon.com permalink
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  Measurement of the inclusive WZ production cross section in pp collisions at $\sqrt{s}$ = 13.6 TeV
  
  The inclusive WZ production cross section is measured in proton-proton collisions at a centre-of-mass energy of 13.6 TeV, using data collected during 2022 with the CMS detector, corresponding to an integrated luminosity of 34.7 fb$^{-1}$. The measurement uses multileptonic final states and a simultaneous likelihood fit to the number of events in four different lepton flavour categories: eee, ee$μ$, $μμ$e, and $μμμ$. The selection is optimized to minimize the number of background events, and relies on an efficient prompt lepton discrimination strategy. The WZ production cross section is measured in a phase space defined within a 30 GeV window around the Z boson mass, as $σ_{\text{total}}$(pp$\to$WZ) = 55.2$\pm$1.2 (stat) $\pm$1.2 (syst) $\pm$0.8 (lumi) $\pm$0.1 (theo) pb. In addition, the cross section is measured in a fiducial phase space closer to the detector-level requirements. All the measurements presented in this paper are in agreement with standard model predictions.
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Freya Blekman (freyablekman@sciencemastodon.com)'s status on Wednesday, 01-Jan-2025 20:38:14 JST Freya Blekman

Another 2024 highlight #CMSPaper is the ATLAS and CMS of the top quark mass, using the data collected in LHC Run 1. The uncertainty of the combination is 1.9 permille! Knowing the mass accurately helps with precision standard model predictions for other particles buff.ly/4cSnRdU
In conversation about a month ago from sciencemastodon.com permalink
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  Combination of measurements of the top quark mass from data collected by the ATLAS and CMS experiments at $\sqrt{s}$ = 7 and 8 TeV
  
  A combination of fifteen top quark mass measurements performed by the ATLAS and CMS experiments at the LHC is presented. The data sets used correspond to an integrated luminosity of up to 5 and 20$^{-1}$ of proton-proton collisions at center-of-mass energies of 7 and 8 TeV, respectively. The combination includes measurements in top quark pair events that exploit both the semileptonic and hadronic decays of the top quark, and a measurement using events enriched in single top quark production via the electroweak $t$-channel. The combination accounts for the correlations between measurements and achieves an improvement in the total uncertainty of 31% relative to the most precise input measurement. The result is $m_\mathrm{t}$ = 172.52 $\pm$ 0.14 (stat) $\pm$ 0.30 (syst) GeV, with a total uncertainty of 0.33 GeV.
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Freya Blekman (freyablekman@sciencemastodon.com)'s status on Tuesday, 17-Dec-2024 19:20:16 JST Freya Blekman

Long awaited: LHCb has seen discrepancies for years in the angular distributions of B→Kμμ signatures (so in transitions of bottom to strange quarks) that definitely do not agree with the prediction. #CMSPaper 1360 now confirms the LHCb measurements https://buff.ly/3OnJSHe
In conversation about a month ago from sciencemastodon.com permalink
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  Angular analysis of the B$^0$ $\to$ K$^*$(892)$^0μ^+μ^-$ decay in proton-proton collisions at $\sqrt{s}$ = 13 TeV
  
  A full set of optimized observables is measured in an angular analysis of the decay B$^0$ $\to$ K$^*$(892)$^0μ^+μ^-$ using a sample of proton-proton collisions at $\sqrt{s}$ = 13 TeV, collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 140 fb$^{-1}$. The analysis is performed in six bins of the squared invariant mass of the dimuon system, $q^2$, over the range 1.1 $\lt$ $q^2$ $\lt$ 16 GeV$^2$. The results are among the most precise experimental measurements of the angular observables for this decay and are compared to a variety of predictions based on the standard model.
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Freya Blekman (freyablekman@sciencemastodon.com)'s status on Friday, 20-Sep-2024 18:20:03 JST Freya Blekman

Still my favourite quote, particle physics is long term physics!
Elisabetta Manca: "I started this research as a summer student, and now I’m in my third year as a postdoc. It’s a marathon, not a sprint.”
https://buff.ly/3Xyv1xW #CMS #StandardModel #Wboson
In conversation about 4 months ago from sciencemastodon.com permalink
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  New results from the CMS experiment put W boson mass mystery to rest
  
  from tracym
  
  Physicists on the CMS experiment announce the most elaborate mass measurement of a particle that is notoriously difficult to study and has captivated the physics community for decades.
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Freya Blekman (freyablekman@sciencemastodon.com)'s status on Saturday, 07-Sep-2024 22:52:01 JST Freya Blekman

Fancy learning what is happening in cutting-edge #physics and #cosmology? The @desy Heinrich Hertz lecture on Thursday, 27 September, by Marc Komionkowski from Johns Hopkins will be organized as a fully hybrid event!
More info:
https://buff.ly/3WVNSCu
In conversation about 5 months ago from sciencemastodon.com permalink
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  Hertz Lectures

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Notices by Freya Blekman (freyablekman@sciencemastodon.com)

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