S. Ansari
Pakistan Atomic Energy Commission
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Publication
Featured researches published by S. Ansari.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1986
H. Anderhub; H. Anders; S. Ansari; R. Becker; R. Becker-Szendy; F. Beissel; A. Böhm; M. Bourquin; J.D. Burger; M. Chen; V. Commichau; E. Deffur; K. Deiters; M. Deutschmann; M. Dhina; K.J. Draheim; J. Fehlmann; D. G. Fong; L. Garrido; U. Gessner; Hanspeter von Gunten; K.Z. Guo; E. Haerdi; K. Hangarter; R. Hausammann; U. Herten; H. Hofer; K. Hofmann; U. Horisberger; D. Hueser
Abstract The design and results from a beam test for a small vertex detector, now installed in the DESY MARK J experiment, are presented. The concept of this drift chamber is based on the time expansion principle with readout planes inclined to solve the left-right ambiguity. A spatial resolution of 35 μm, varying weakly as a function of drift length and azimuthal angle, has been achieved.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1988
H. Anderhub; H. Anders; S. Ansari; A. Boehm; M. Bourquin; J.D. Burger; M. Chen; V. Commichau; M. Deutschmann; M. Dhina; K.J. Draheim; J. Fehlmann; D. Fong; U. Gessner; K. Hangarter; R. Hausammann; U. Herten; H. Hofer; K. Hofmann; M.M. Ilyas; B. Krause; R. Leiste; Q.Z. Li; D. Linnhoefer; X. Lue; S. Masson; M. Nusbaumer; H. Nierobisch; M. Pohl; R.R. Rau
Abstract A high-resolution drift chamber based on the time expansion principle has been built as a vertex detector for the Mark J experiment at DESY. The chamber design and the associated control and readout system are described. Results on chamber performance obtained from test beam measurements and first results from running at PETRA are reported.
Physics Letters B | 1986
B. Adeva; H. Anderhub; S. Ansari; U. Becker; R. Becker-Szendy; J. Berdugo; A. Boehm; M. Bourquin; J.G. Branson; J.D. Burger; C. Camps; M. Cerrada; C.C. Chang; Y.H. Chang; Hesheng Chen; M. Chen; M. L. Chen; M.Y. Chen; V. Commichau; E. Deffur; K. Deiters; M. Dhina; J. Fehlmann; H.S. Fesefeldt; D. Fong; W. Friebel; M. Fukushima; L. Garrido; K.Z. Guo; M. Hausammann
The strong interaction coupling constant αs has been measured with a new method, the planar triple energy correlation in the reaction e+e- → hadrons at center-of-mass energies ranging from 14 GeV to 46.78 GeV. A complete second-order perturbative QCD calculation was used. ΛMS = 110 ± 30 −55+70 MeV is found.
Physics Letters B | 1987
B. Adeva; H. Anderhub; S. Ansari; U. Becker; R. Becker-Szendy; J. Berdugo; A. Boehm; M. Bourquin; J. G. Branson; J.D. Burger; C. Camps; M. Cerrada; C.C. Chang; Y. H. Chang; H. S. Chen; M. Chen; M. L. Chen; M.Y. Chen; V. Commichau; E. Deffur; K. Deiters; M. Dhina; J. Fehlmann; H.S. Fesefeldt; D. G. Fong; W. Friebel; M. Fukushima; L. Garrido; K.Z. Guo; R.D. Han
We study the production of single γ, e and μ at high πt using the high energy data of the Mark-J detector at PETRA. We find good agreement with QED. We give mass limits of the SUSY particles γ, v, e and W studying the associated production of W and ẽ and radiative production of pairs of γ or v in three-body reactions.
Archive | 1988
H. Anderhub; H. Anders; S. Ansari; A. Boehm; M. Bourquin; J.D. Burger; M. Chen; V. Commichau; M. Deutschmann; M. Dhina; K. J. Draheim; J. Fehlmann; D. Fong; W. Friebel; U. Gessner; K. Hangarter; R. Hausammann; U. Herten; H. Hofer; K. Hofmann; M.M. Ilyas; B. Krause; R. Leiste; Q. Z. Li; D. Linnhoefer; X. Lue; S. Masson; M. Nusbaumer; H. Nierobisch; W. D. Nowak
A high-resolution drift chamber based on the time expansion principle has been built as a vertex detector for the Mark-J experiment at DESY. Results on the chamber performance obtained from test beam measurements and first results from running at PETRA are reported.
Physics Letters B | 1987
B. Adeva; H. Anderhub; S. Ansari; U. Becker; R. Becker-Szendy; J. Berdugo; A. Boehm; M. Bourquin; J. G. Branson; J.D. Burger; C. Camps; M. Cerrada; C.C. Chang; Y. H. Chang; H. S. Chen; M. Chen; M. L. Chen; M.Y. Chen; V. Commichau; E. Deffur; K. Deiters; M. Dhina; J. Fehlmann; H.S. Fesefeldt; D. G. Fong; W. Friebel; M. Fukushima; L. Garrido; K.Z. Guo; R.D. Han
We study the production of single γ, e and μ at high πt using the high energy data of the Mark-J detector at PETRA. We find good agreement with QED. We give mass limits of the SUSY particles γ, v, e and W studying the associated production of W and ẽ and radiative production of pairs of γ or v in three-body reactions.
Physics Letters B | 1986
B. Adeva; D. G. Fong; U. Becker; Marquina; Z. Wang; H.W. Tang; V. Commichau; H. Anderhub; H.S. Fesefeldt; Q. Z. Li; S. Ansari; M. Bourquin; B. Wyslouch; M. Tonutti; R.R. Rau; H. Rykaczewski; E. Deffur; G. Viertel; K.Z. Guo; M. Dhina; M. J. White; H. B. Newman; R. Schulte; C. Camps; J. G. Branson; R. Y. Zhu; K.L. Tung; M.M. Ilyas; B. Zhou; B.X. Yang
We study the production of single γ, e and μ at high πt using the high energy data of the Mark-J detector at PETRA. We find good agreement with QED. We give mass limits of the SUSY particles γ, v, e and W studying the associated production of W and ẽ and radiative production of pairs of γ or v in three-body reactions.
Physical Review D | 1986
B. Adeva; S. Ansari; U. Becker; R. Becker-Szendy; J. Berdugo; A. Boehm; J. G. Branson; J.D. Burger; M. Capell; M. Cerrada; C.C. Chang; Y. H. Chang; H. S. Chen; M. Chen; M. L. Chen; M.Y. Chen; Y.K. Chi; E. Deffur; K. Deiters; M. Demarteau; M. Dhina; B.Z. Dong; P. Duinker; H.S. Fesefeldt; D. G. Fong; M. Fukushima; L. Garrido; R.D. Han; D. Harting; G. Herten
Physical Review D | 1988
B. Adeva; H. Anderhub; S. Ansari; U. Becker; R. Becker-Szendy; J. Berdugo; A. Boehm; M. Bourquin; J. G. Branson; J.D. Burger; C. Camps; M. Cerrada; C.C. Chang; Y. H. Chang; H. S. Chen; M. Chen; M. L. Chen; M.Y. Chen; Commichau; E. Deffur; K. Deiters; M. Dhina; J. Fehlmann; H.S. Fesefeldt; D. G. Fong; W. Friebel; M. Fukushima; L. Garrido; K.Z. Guo; R.D. Han
Physical Review D | 1988
B. Adeva; D. G. Fong; U. Becker; Marquina; Z. Wang; V. Commichau; H. Anderhub; H.S. Fesefeldt; Q. Z. Li; S. Ansari; M. Bourquin; B. Wyslouch; M. Tonutti; R.R. Rau; H. Rykaczewski; E. Deffur; G. Viertel; K.Z. Guo; M. Dhina; M. J. White; H. B. Newman; H.W. Tang; C. Camps; J. G. Branson; R. Y. Zhu; K.L. Tung; M.M. Ilyas; B. Zhou; B.X. Yang; H.J. Schreiber
