#CMSPaper 1233: This paper measures how many charm quarks are made in the proton through quantum fluctuations. It does that by measuring the simultaneous production of charm quark jets and W bosons. To see charm quark jets and measure this precisely, you need a LOT of #machinelearning btw

http://arxiv.org/abs/2308.02285 @CMSexperiment

#CMSPaper 1232: The LHC also acts (rarely!) as a W/Z boson collider and then makes #HiggsBosons. This is a challenging signature with loads of background, including from other Higgs bosons. There is a promising 2.6σ bump at 125 (ish) GeV di-b-jet mass 🤩

http://arxiv.org/abs/2308.01253

#CMSPaper 1231: It is commonly accepted that the #StandardModel is an effective theory, meaning it stops working at high energy. This #measurement uses #topquarks to test a pragmatic extension to the standard model, called standard model effective field theory (#SMEFT) assuming that more complex interactions are possible and each will change the behavior of existing particles like top quarks. And those changes can be checked (which is what this paper does)

https://arxiv.org/abs/2307.15761

#CMSPaper even simpler:

We measure how well charm quarks are included inside composite particles, by comparing how stable the particles are in busy and not-so-busy collisions.

https://sciencemastodon.com/@freyablekman/110819161411818789

#CMSPaper 1229: the Λ+c particle is a bit like a proton but contains ud and c quarks. This paper compares the production of the Λ+c in proton and lead collisions. The differences explain how hadronisation (the clumping of quarks to stable particles, a not 100% understood process) works https://arxiv.org/abs/2307.11186 @CMSexperiment #CERN #particles #particlephysics #quarks

#CMSpaper even shorter:

We measure if particles being produced (relatively) far away from each other still feel each other in proton-proton LHC collisions, which happens and was not expected (but expected in lead-lead collisions). This paper measures that effect in a new way (and more precisely)

https://sciencemastodon.com/@freyablekman/110807845797642798

#CMSPaper 1228: one of the #unexpected #discoveries by CMS is correlations between the particles in proton-proton collisions, and this paper measures those in more detail by comparing short-range to long-range particle charges in various LHC collisions http://arxiv.org/abs/2307.11185 CMS Collaboration #CERN #physics #highenergynuclearphysics #ridge #particles #heavyionphysics

#CMSPaper even shorter:

We do not see any new Z bosons made together with b quarks that could explain the anomalies in the same signature seen by LHCb and similar flavour experiments #scientificMethod #nullresult

https://sciencemastodon.com/@freyablekman/110796775448819736

#CMSPaper 1227: Another search paper (about 35ish % of CMS papers are direct searches for new #particles; most results are measurements of standard model particles+properties).

We confirm we did not see a high-mass di-muon resonance produced together with b jets in the 2015-2018 @CMSexperiment data. This is important as the signature is related to the transition of b to other quarks, where flavour experiments see deviations that could be explained with such a particle https://arxiv.org/abs/2307.08708

Not new, but newly published #CMSPaper about #DiHiggs #HHmultilepton https://link.springer.com/article/10.1007/JHEP07(2023)095 :partying_face: With recent progress in Analysis techniques and the amount of data taken in the #LHC Run 2 the @CMSexperiment and the #ATLASExperiment have become more and more sensitive to the rarest of #ParticlePhysics processes. This includes the study of processes involving the production of not one, but two #HiggsBosons. 1/9

#CMSPaper 1225 even simpler:

we've measured the shape of the quark gluon plasma blob. This will allow better understanding of the quark gluon plasma, which is important for all very closely packed physics systems (neutron stars are the obvious example)
https://sciencemastodon.com/@freyablekman/110662496328401525

#CMSPaper 1225: This paper uses over 4 billion LHC lead-lead collisions to study the shape of the quark-gluon plasma using quantum-correlations, called Bose-Einstein correlations, between two particles in the collision. The conclusion: the shape of the #quarkgluonplasma is not as simple as we figured. Lévy functions describe the data (yay!), and we measure those accurately so these can be used to model/predict other collisions in the future!
https://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-21-011/index.html @CMSexperiment

#CMSPaper 1223 even simpler:

We've seen particles made out of four charm quarks! this is special because most particles are made out of three or two quarks, and also definitely not charm quarks!

https://sciencemastodon.com/@freyablekman/110616029682494453

#CMSPaper 1223: There are multiple resonances in the J/ψ-J/ψ mass distribution (some spotted by LHCb earlier), and @CMSexperiment also sees a new one. Whether you should call them particles or something else is somewhat controversial... so take that as you wish.. hopefully this result will help figure out whether it is a blob of quarks or two quark-pairs spinning around each other, or even something resembling a molecule! Plenty of questions, this is an exciting result 🤯 https://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-21-003/index.html

#CMSPaper 1121 even simpler:

it turns out that particles that are bigger get stopped by a dense blob of quarks and gluons, and we checked this is true also the further they travel through that dense blob

https://sciencemastodon.com/@freyablekman/110542655038671270

#CMSPaper 1221: J/ψ particles are produced copiously at the LHH, also in heavy ion collisions. But because it is made of (relatively) heavy #charm quarks, the J/ψ is great for testing the quark-gluon plasma. This paper measures for the first time how this is different depending on how far the J/ψ particle travels by selecting J/ψ particles that travel relatively far or less far https://arxiv.org/abs/2305.16928 @CMSexperiment #CERN #physics #HighEnergyNuclearPhysics #physics

#CMSPaper 1222: Is there a #Higgsboson-like particle that decays to an electron and muon? This is obviously a big question with huge implications, so the best answer we can give for now is Possibly...

We see some extra collisions around 146 GeV mass, but they are insufficient to get excited for now. The data is at 2.8 sigma inconsistent with background = chance of fluke 1/380ish. More data is being collected - so #stayTuned 🤯🎁📊⁉️

http://arxiv.org/abs/2305.18106
#CERN @CMSexperiment

#CMSPaper 1220 even simpler:

We see four top quarks produced at once, in data we already analysed before. This time we used much more #MachineLearning

This measurement helps us test the standard model, specifically in the context of the Higgs mechanism and the strong force!

https://sciencemastodon.com/@freyablekman/110531103284061009

#CMSpaper 1220: The study of rare production of known particles helps to test the standard model (because undiscovered particles affect them). This paper presents the observation (5 sigma!) of the production of four top quarks by re-analyzing a dataset that was previously examined in 2019. The extra years really made a lot of difference here, and we understand our data so much better! Also (of course): #machinelearning helps https://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-22-013/index.html #physics #particlephysics @CMSexperiment #CERN

#CMSPaper 1218 even simpler:

We've searched for black holes (yes we do) and undiscovered particles in signatures with a very energetic photon.

We did not see any.

https://sciencemastodon.com/@freyablekman/110451232755975328