A. Ershov
Harvard University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by A. Ershov.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2001
E. von Toerne; M. S. Alam; J. P. Alexander; A. Anastassov; K. Arndt; A. Bean; F. Blanc; G. Boyd; G. Brandenburg; J. Cherwinka; J. E. Duboscq; E. Eckhart; A. Ershov; J. Fast; A. D. Foland; P. I. Hopman; K. K. Gan; Y. S. Gao; H. Kagan; S. Kane; L. Kazkaz; R. Kass; D. Y. Kim; Junghoon Lee; A. Magerkurth; David Harry Miller; J. Miyamoto; M. Neustadt; J. Oliver; V. Pavlunin
Abstract CLEO III is the new experimental phase of the CLEO experiment at the CESR accelerator. Both the accelerator and the detector have recently been upgraded. A new charged particle tracking system with the addition of a ring imaging Cherenkov particle identification system has been installed. A major part of the tracking system upgrade was the construction of a new four-layer double-sided silicon tracker with 93% solid angle coverage and new readout electronics. The CLEO III upgrade was completed in February 2000 with the installation of the silicon detector. CLEO III has finished the commissioning phase and is now taking data. The design of the detector and first performance results are presented here.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2003
R. Kass; M. S. Alam; J. P. Alexander; A. Anastassov; K. Arndt; A. Bean; F. Blanc; G. Boyd; G. Brandenburg; J. Cherwinka; J. E. Duboscq; E. Eckhart; A. Ershov; J. Fast; A.D. Foland; P.I. Hopman; K. K. Gan; Y. S. Gao; H. Kagan; S. Kane; L. Kazkaz; D. Y. Kim; Junghoon Lee; A. Magerkurth; David Harry Miller; J. Miyamoto; M. Neustadt; J. Oliver; V. Pavlunin; C. Rush
Abstract The design and operation of the CLEO III silicon vertex detector is described in this report. This detector consists of four layers of double-sided silicon wafers covering 93% of the solid angle. After initially meeting its signal-to-noise and spatial resolution design goals, the r − φ side efficiency of layers 1 and 2 decreased dramatically due to radiation-induced sensor effects.
Physical Review D | 2002
A. H. Mahmood; S. E. Csorna; I. Danko; Z. Xu; G. Bonvicini; D. Cinabro; M. Dubrovin; S. McGee; A. Bornheim; E. Lipeles; S. P. Pappas; A. Shapiro; W. M. Sun; A. J. Weinstein; G. Masek; H. P. Paar; R. Mahapatra; R. J. Morrison; H. N. Nelson; R. A. Briere; G. P. Chen; T. Ferguson; G. Tatishvili; H. Vogel; N. E. Adam; J. P. Alexander; C. Bebek; K. Berkelman; F. Blanc; V. Boisvert
The Xi^+_c lifetime is measured using 9.0 fb^-1 of e+e- annihilation data collected on and just below the Upsilon(4S) resonance with the CLEO II.V detector at CESR. This is the first measurement of the Xi^+_c lifetime from a collider experiment. Using an unbinned maximum likelihood fit, the Xi^+_c lifetime is measured to be 503 +/- 47 (stat.) +/- 18 (syst.) fs. The precision of this measurement is comparable to previous measurements carried out by fixed target experiments with different sources of systematic uncertainties.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2003
E. von Toerne; M. S. Alam; J. P. Alexander; A. Anastassov; K. Arndt; A. Bean; F. Blanc; G. Boyd; G. Brandenburg; J. Cherwinka; J.E. Duboscq; E. Eckhart; A. Ershov; J. Fast; A. D. Foland; P. I. Hopman; K. K. Gan; Y. S. Gao; H. Kagan; S. Kane; L. Kazkaz; R. Kass; D. Y. Kim; Junghoon Lee; A. Magerkurth; D. H. Miller; J. Miyamoto; M. Neustadt; J. Oliver; V. Pavlunin
Abstract The CLEO-III silicon vertex detector is a 4-layer device with double-sided silicon sensors arranged in a barrel design, covering 93% of the solid angle. After initially meeting its design goals of signal-to-noise performance and spatial resolution, the signal efficiency deteriorated on the rφ sensor side in the two innermost layers due to radiation induced sensor effects. Operation of the two outermost layers and the z -coordinate readout in all layers is stable.
Physical Review D | 2001
A. Gritsan; J. P. Alexander; R. Baker; C. Bebek; B. E. Berger; K. Berkelman; F. Blanc; V. Boisvert; D. G. Cassel; P. S. Drell; J. E. Duboseq; K. M. Ecklund; R. Ehrlich; P. Gaidarev; L. Gibbons; B. Gittelman; S. W. Gray; D. L. Hartill; B. K. Heltsley; P. I. Hopman; L. Hsu; C. D. Jones; J. Kandaswamy; D. L. Kreinick; M. Lohner; A. Magerkurth; T. O. Meyer; N. B. Mistry; E. Nordberg; M. Palmer
We report on a search for the decay B+ -> D*+ K0_S and its charge conjugate with the CLEO detector at the Cornell Electron Storage Ring (CESR). No candidates are found in 9.10/fb of data. The background is estimated to be 0.29 +- 0.05 leading to an upper limit BF(B+ -> D*+ K0_S) = 9.5 x 10^{-5} (90% C.L.).
