Performance of the CMS Cathode Strip Chambers with Cosmic Rays

The Cathode Strip Chambers (CSCs) constitute the primary muon tracking device in the CMS endcaps. Their performance has been evaluated using data taken during a cosmic ray run in fall 2008. Measured noise levels are low, with the number of noisy channels well below 1%. Coordinate resolution was measured for all types of chambers, and fall in the range 47 microns to 243 microns. The efficiencies for local charged track triggers, for hit and for segments reconstruction were measured, and are above 99%. The timing resolution per layer is approximately 5 ns

Późny przerzut do wątroby raka rdzeniastego tarczycy z niskim stężeniem kalcytoniny skutecznie wyleczony metodą radioablacji

  A 28-year-old female consulted in 1994 for a left thyroid nodule known for two years with documented progression. Left lobe resection was performed initially followed by total thyroidectomy without lymph node dissection in September 1994. Pathological examination concluded on unilateral 10 × 40 mm medullary thyroid carcinoma (MTC). RET mutation was negative. Basal and pentagastrin-stimulated CT levels had been normal from 1994 to 2008 when her CT level was found to be elevated at 33 ng/L and increased subsequently to 111 ng/L in 2010. In accordance with guidelines, cervical ultrasound was performed repeatedly with negative results. After discussion in a multidisciplinary meeting and with patient’s consent, an F-Dopa PET scan was proposed in disagreement with guidelines. This scan showed unique uptake in liver segment VI, which was confirmed by MRI. CT levels reached to 253 ng/L when she finally accepted treatment. In February 2013 we performed radiofrequency ablation of the lesion, which allowed normalisation of CT levels. This observation highlights the possibility of late recurrence of MTC. We could propose that for MTC patients with low-calcitonin levels-recurrences F-DOPA-PET/CT is a good diagnostic tool to use in case of repeatedly negative US neck studies. (Endokrynol Pol 2016; 67 (3): 326–329)    Chora w wieku 28 lat zgłosiła się do lekarza w 1994 roku z powodu lewostronnego guzka tarczycy wykrytego 2 lata wcześniej, z potwierdzoną progresją. Wykonano resekcję lewego płata tarczycy. Totalną tyreoidektomię wykonano we wrześniu 1994 roku bez usunięcia węzłów chłonnych. W badaniu patomorfologicznych stwierdzono jednostronnego raka rdzeniastego tarczycy (MTC) o wymiarach 10 × 40 mm. Wynik badania w kierunku mutacji RET był ujemny. Stężenia kalcytoniny (CT, calcitonin), podstawowe i po stymulacji pentagastryną, były prawidłowe od 1994 roku. Do 2008 roku, kiedy stwierdzono podwyższone stężenie CT wynoszące 33 ng/l, a następnie jego dalszy wzrost do 111 ng/l w 2010 roku. Zgodnie z zaleceniami powtórnie wykonano badanie USG szyi, w którym nie stwierdzono nieprawidłowości. Po omówieniu przypadku na spotkaniu wielodyscyplinarnego zespołu i uzyskaniu zgody chorej przeprowadzono badanie F-Dopa PET (niezgodnie z zaleceniami), w którym wykazano pojedyncze ognisko wychwytu w segmencie VI wątroby, co zostało potwierdzone w badaniu MRI. Kiedy chora w końcu zaakceptowała leczenie, stężenia CT zwiększyły się do 253 ng/l. W lutym 2013 roku wykonano ablację zmiany prądem o częstotliwości radiowej, co pozwoliło uzyskać normalizację stężeń CT w 2015 r. Ta obserwacja zwraca uwagę na możliwość późnej wznowy. Autorzy sugerują, że u chorych z MTC z ponownie stwierdzonym niskim stężeniem kalcytoniny wybór F-DOPA-PET/CT jako metody diagnostycznej jest dobrym rozwiązaniem w przypadku powtórnych ujemnych wyników USG szyi. (Endokrynol Pol 2016; 67 (3): 326–329)

Study of hadronic event-shape variables in multijet final states in pp collisions at √s=7 TeV

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Search for massive resonances decaying in to WW,WZ or ZZ bosons in proton-proton collisions at root s=13 TeV

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Search for heavy gauge W ' bosons in events with an energetic lepton and large missing transverse momentum at root s=13TeV

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Search for narrow resonances in dilepton mass spectra in proton-proton collisions at sqrt(s) = 13 TeV and combination with 8 TeV data

A search for narrow resonances in dielectron and dimuon invariant mass spectra has been performed using data obtained from proton–proton collisions at View the MathML sources=13 TeV collected with the CMS detector. The integrated luminosity for the dielectron sample is 2.7 fb−1 and for the dimuon sample 2.9 fb−1. The sensitivity of the search is increased by combining these data with a previously analyzed set of data obtained at View the MathML sources=8 TeV and corresponding to a luminosity of 20 fb−1. No evidence for non-standard-model physics is found, either in the 13 TeV data set alone, or in the combined data set. Upper limits on the product of production cross section and branching fraction have also been calculated in a model-independent manner to enable interpretation in models predicting a narrow dielectron or dimuon resonance structure. Limits are set on the masses of hypothetical particles that could appear in new-physics scenarios. For the View the MathML sourceZSSM′ particle, which arises in the sequential standard model, and for the superstring inspired View the MathML sourceZψ′ particle, 95% confidence level lower mass limits for the combined data sets and combined channels are found to be 3.37 and 2.82 TeV, respectively. The corresponding limits for the lightest Kaluza–Klein graviton arising in the Randall–Sundrum model of extra dimensions with coupling parameters 0.01 and 0.10 are 1.46 and 3.11 TeV, respectively. These results significantly exceed the limits based on the 8 TeV LHC data

Search for light bosons in decays of the 125 GeV Higgs boson in proton-proton collisions at root s=8 TeV

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Search for black holes and other new phenomena in high-multiplicity final states in proton-proton collisions at root s=13 TeV

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Measurements of the pp → ZZ production cross section and the Z → 4ℓ branching fraction, and constraints on anomalous triple gauge couplings at √s = 13 TeV

Four-lepton production in proton-proton collisions, pp -> (Z/gamma*)(Z/gamma*) -> 4l, where l = e or mu, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb(-1). The ZZ production cross section, sigma(pp -> ZZ) = 17.2 +/- 0.5 (stat) +/- 0.7 (syst) +/- 0.4 (theo) +/- 0.4 (lumi) pb, measured using events with two opposite-sign, same-flavor lepton pairs produced in the mass region 60 4l) = 4.83(-0.22)(+0.23) (stat)(-0.29)(+0.32) (syst) +/- 0.08 (theo) +/- 0.12(lumi) x 10(-6) for events with a four-lepton invariant mass in the range 80 4GeV for all opposite-sign, same-flavor lepton pairs. The results agree with standard model predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZ and ZZ. couplings at 95% confidence level: -0.0012 < f(4)(Z) < 0.0010, -0.0010 < f(5)(Z) < 0.0013, -0.0012 < f(4)(gamma) < 0.0013, -0.0012 < f(5)(gamma) < 0.0013

Mechanical stability of the CMS strip tracker measured with a laser alignment system

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