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Full-Text Articles in Physical Sciences and Mathematics
Commissioning And Performance Of The Cms Pixel Tracker With Cosmic Ray, Serguei Chatrchyan Muons, Stefan Spanier
Commissioning And Performance Of The Cms Pixel Tracker With Cosmic Ray, Serguei Chatrchyan Muons, Stefan Spanier
stefan spanier
The pixel detector of the Compact Muon Solenoid experiment consists of three barrel layers and two disks for each endcap. The detector was installed in summer 2008, commissioned with charge injections, and operated in the 3.8 T magnetic field during cosmic ray data taking. This paper reports on the first running experience and presents results on the pixel tracker performance, which are found to be in line with the design specifications of this detector. The transverse impact parameter resolution measured in a sample of high momentum muons is 18 microns.
Observation Of Long-Range Near-Side Angular Correlations In Proton-Proton Collisions At The Lhc, Stefan Spanier
Observation Of Long-Range Near-Side Angular Correlations In Proton-Proton Collisions At The Lhc, Stefan Spanier
stefan spanier
Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a broad range of pseudorapidity (eta) and azimuthal angle (phi). Short-range correlations in Delta(eta), which are studied in minimum bias events, are characterized using a simple "independent cluster" parametrization in order to quantify their strength (cluster size) and their extent in eta (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 inverse nb data set …
Results From A Beam Test Of A Prototype Plt Diamond Pixel Telescope, R. Hall-Wilton, R. Loos, V. Ryjov, M. Pernicka, S. Schmied, H. Steninger, V. Halyo, B. Harrop, A. Hunt, D. Marlow, B. Sands, D. Strickland, O. Atramentov, E. Bartz, J. Doroshenko, Y. Gershtein, D. Hits, S. Schnetzer, R. Stone, P. Bulter, S. Lansley, N. Rodrigues, W. Bugg, M Hollingsworth, Stefan Spanier, W. Johns
Results From A Beam Test Of A Prototype Plt Diamond Pixel Telescope, R. Hall-Wilton, R. Loos, V. Ryjov, M. Pernicka, S. Schmied, H. Steninger, V. Halyo, B. Harrop, A. Hunt, D. Marlow, B. Sands, D. Strickland, O. Atramentov, E. Bartz, J. Doroshenko, Y. Gershtein, D. Hits, S. Schnetzer, R. Stone, P. Bulter, S. Lansley, N. Rodrigues, W. Bugg, M Hollingsworth, Stefan Spanier, W. Johns
stefan spanier
We describe results from a beam test of a telescope consisting of three planes of single-crystal, diamond pixel detectors. This telescope is a prototype for a small-angle luminosity monitor, the Pixel Luminosity Telescope (PLT), for CMS. We recorded the pixel addresses and pulse heights of all pixels over threshold as well as the fast-or signals from all three telescope planes. We present results on the telescope performance including occupancies, pulse heights, fast-or efficiencies and particle tracking. These results show that the PLT design meets all required specifications.
Performance Of A Single-Crystal Diamond-Pixel Telescope, R. Hall-Wilton, V. Ryjov, M. Pernicka, V. Halyo, B. Harrop, A. Hunt, D. Marlow, E. Bartz, J. Doroshenko, D. Hits, S. Schnetzer, R. Stone, W. Bugg, M. Hollingsworth, Stefan Spanier, W. Johns
Performance Of A Single-Crystal Diamond-Pixel Telescope, R. Hall-Wilton, V. Ryjov, M. Pernicka, V. Halyo, B. Harrop, A. Hunt, D. Marlow, E. Bartz, J. Doroshenko, D. Hits, S. Schnetzer, R. Stone, W. Bugg, M. Hollingsworth, Stefan Spanier, W. Johns
stefan spanier
We describe the results from a beam test of a telescope consisting of three planes of single-crystal, diamond pixel detectors. This telescope is a prototype for a proposed small-angle luminosity monitor, the Pixel Luminosity Telescope (PLT), for CMS. We recorded the pixel addresses and pulse heights of all pixels over threshold as well as the fast-or signals from all three telescope planes. We present results on the telescope performance including occupancies, pulse heights, fast-or efficiencies and particle tracking. These results show that the PLT design concept is sound and indicate that the project is ready to proceed with the next …
Measurement Of Cp-Violating Asymmetries In The B0 --> K+K−K0 Dalitz Plot, Stefan Spanier
Measurement Of Cp-Violating Asymmetries In The B0 --> K+K−K0 Dalitz Plot, Stefan Spanier
stefan spanier
No abstract provided.
Scalar Mesons In D And B Decays, Stefan Spanier
Scalar Mesons In D And B Decays, Stefan Spanier
stefan spanier
The decays of D and B mesons provide new insights into the natur of light scalar mesons. Several recent measurements are presented.
Measurement Of Cp Asymmetries In B0 --> KS0∏0∏0, B. Aubert, Stefan Spanier
Measurement Of Cp Asymmetries In B0 --> KS0∏0∏0, B. Aubert, Stefan Spanier
stefan spanier
We present a preliminary measurement of the time-dependent CP asymmetry for the neutral B-meson decay into the CP = +1 final state K0 Sπ0π0, with K0 S → π+π− and π0 → γγ. We use a sample of approximately 227 million B-meson pairs recorded at the Υ(4S) resonance by the BABAR detector at the PEP-II B-Factory at SLAC. From a maximum likelihood fit we extract the mixing-induced CP-violation parameter SK0 Sπ0π0 = 0.84 ± 0.71 (stat) ± 0.08 (syst) and the direct CP-violation parameter CK0 Sπ0π0 = 0.27 ± 0.52 (stat) ± 0.13 (syst), where the first uncertainty is statistical …
Measurement Of Cp Asymmetries In B0 --> {Eff}K0 And B0 --> K+K-K0S Decays, B. Aubert, Stefan Spanier
Measurement Of Cp Asymmetries In B0 --> {Eff}K0 And B0 --> K+K-K0S Decays, B. Aubert, Stefan Spanier
stefan spanier
We measure the time-dependent CP asymmetry parameters in B0 --> K+ K- K0 based on a data sample of approximately 227 million B-meson pairs recorded at the Upsilon(4S) resonance with the BaBar detector at the PEP-II B-meson Factory at SLAC. We reconstruct two-body B0 decays to Phi(1020) K0S and Phi(1020)K0L, and the three-body decay K+ K- K0S with Phi(1020) K0S excluded. For the B0 --> Phi K0 decays, we measure sin(2 beta_{eff})(Phi K0) = +0.50 +/- 0.25(stat) +0.07/-0.04(syst). The B0 --> K+ K- K0S decays are dominated by K+ K- S-wave, as determined from an angular analysis; we measure sin(2 …