Energy resolution of the CMS crystal electromagnetic calorimeter has been measured with an electron test beam using a fully equipped barrel supermodule. Both intrinsic energy resolution and energy ...resolution for electrons with quasi-uniform impact on the crystal surface are measured. The amplitude of the signal collected from crystals is reconstructed by a digital filtering technique and corrections for the position dependent response are applied in the case of quasi-uniform impact. The resolution measured for the supermodule is fully compatible with design expectations.
AbstractWe review the status of published and preliminary measurements of triple and quartic gauge boson couplings from the four LEP experiments. Charged current triple gauge boson couplings (WWZ and ...WWγ) are measured using W-pair, single-W and single-γ productions with the data collected between 1997 and 2000 (\(700\ \mathrm{pb}^{-1}\) per experiment). Neutral current triple gauge boson couplings are studied with Zγ (Zγγ* and ZγZ* vertices) and ZZ (ZZγ* and ZZZ* vertices) events. Limits on anomalous quartic gauge boson couplings with at least one photon (WWγγ, WWZγ and ZZγγ) are set from WWγ, \(q\bar{q}\gamma\gamma\) and \(\nu\bar{\nu}\gamma\gamma\) events. No strong deviations from the Standard Model expectations are found.
We discuss theoretical uncertainties of the distribution in the cosine of the W polar angle projected into a measurement of the anomalous triple gauge-boson coupling λ=λγ=λZ at LEP2 energies for the ...tandem of the Monte Carlo event generators KoralW and YFSWW3 and for the Monte Carlo event generator RacoonWW. Exploiting numerical results of these programs and cross-checks with experimental fitting procedures, we estimate that the theoretical uncertainty of the value of λ due to electroweak corrections, as obtained at LEP2 with the help of these programs, is ∼0.005, about half of the expected experimental error for the combined LEP2 experiments (∼0.010). We use certain idealized event selections; however, we argue that these results are valid for realistic LEP2 measurements.
The first measurements from proton–proton collisions recorded with the ATLAS detector at the LHC are presented. Data were collected in December 2009 using a minimum-bias trigger during collisions at ...a centre-of-mass energy of 900 GeV. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity, and the relationship between mean transverse momentum and charged-particle multiplicity are measured for events with at least one charged particle in the kinematic range |η|<2.5|η|<2.5 and pT>500 MeVpT>500 MeV. The measurements are compared to Monte Carlo models of proton–proton collisions and to results from other experiments at the same centre-of-mass energy. The charged-particle multiplicity per event and unit of pseudorapidity at η=0η=0 is measured to be 1.333±0.003(stat.)±0.040(syst.)1.333±0.003(stat.)±0.040(syst.), which is 5–15% higher than the Monte Carlo models predict.
We present a collection of signatures for physics beyond the standard model that need to be explored at the LHC. First, are presented various tools developed to measure new particle masses in ...scenarios where all decays include an unobservable particle. Second, various aspects of supersymmetric models are discussed. Third, some signatures of models of strong electroweak symmetry are discussed. In the fourth part, a special attention is devoted to high mass resonances, as the ones appearing in models with warped extra dimensions. Finally, prospects for models with a hidden sector/valley are presented. Our report, which includes brief experimental and theoretical reviews as well as original results, summarizes the activities of the "New Physics" working group for the "Physics at TeV Colliders" workshop (Les Houches, France, 8-26 June, 2009).
Phys.Lett.B533:75-84,2002 We discuss theoretical uncertainties of the distribution in the cosine of the
W polar angle projected into a measurement of the anomalous triple gauge-boson
coupling ...\lambda=\lambda_{\gamma}=\lambda_Z at LEP2 energies for the tandem of
the Monte Carlo event generators KoralW and YFSWW3 and for the Monte Carlo
event generator RacoonWW. Exploiting numerical results of these programs and
cross-checks with experimental fitting procedures, we estimate that the
theoretical uncertainty of the value of \lambda due to electroweak corrections,
as obtained at LEP2 with the help of these programs, is ~0.005, about half of
the expected experimental error for the combined LEP2 experiments (~0.010). We
use certain idealized event selections; however, we argue that these results
are valid for realistic LEP2 measurements.
We discuss theoretical uncertainties of the distribution in the cosine of the W polar angle projected into a measurement of the anomalous triple gauge-boson coupling ...\lambda=\lambda_{\gamma}=\lambda_Z at LEP2 energies for the tandem of the Monte Carlo event generators KoralW and YFSWW3 and for the Monte Carlo event generator RacoonWW. Exploiting numerical results of these programs and cross-checks with experimental fitting procedures, we estimate that the theoretical uncertainty of the value of \lambda due to electroweak corrections, as obtained at LEP2 with the help of these programs, is ~0.005, about half of the expected experimental error for the combined LEP2 experiments (~0.010). We use certain idealized event selections; however, we argue that these results are valid for realistic LEP2 measurements.
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