M.M. Ilyas
Massachusetts Institute of Technology
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Publication
Featured researches published by M.M. Ilyas.
Physics Letters B | 1985
B. Adeva; U. Becker; R. Becker-Szendy; J. Berdugo; A. Böhm; 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; E. Deffur; M. Demarteau; B.Z. Dong; P. Duinker; H.S. Fesefeldt; D. G. Fong; M. Fukushima; L. Garrido; R.D. Han; D. Harting; G. Herten; M.C. Ho; D. Hüser; M. Hussain; M.M. Ilyas
Abstract PETRA, the e + e − collider, has operated at a maximum CM energy of 46.78 GeV. We update our previous results on new particle searches and set significantly better mass limits on some.
Physical Review Letters | 1983
B. Adeva; Q. Z. Li; D. G. Fong; U. Becker; R.R. Rau; Samuel C.C. Ting; H.G. Wu; H.W. Tang; K. Sinram; H.S. Fesefeldt; B. Zhou; M. Steuer; G. Herten; S. Wu; B. Wyslouch; P. Kuijer; H. Rykaczewski; P. Duinker; J. P. Revol; M. J. White; M.Y. Chen; H. B. Newman; M.A. Marquina; M. Wang; C.C. Chang; F.P. Poschmann; H. S. Chen; Z. Y. Feng; I. Schulz; G.M. Swider
The results of a high-statistics study of inclusive muon spectra at PETRA are reported. Improved mass limits have been obtained for heavy quarks, heavy leptons, and charged Higgs particles. It is shown that the fragmentation properties of b quarks and c quarks are different, with the mean fragmentation variables = 0.75 +- 0.03 +- 0.06, = 0.46 +- 0.02 +- 0.05 and the average semileptonic branching ratio for the B and C hadrons BR(B) = (10.5 +- 1.5 +- 1.3)%, BR(C) = (11.5 +- 1.0 +- 1.7)%.
Physics Letters B | 1982
B. Adeva; D. P. Barber; U. Becker; J. Berdugo; G. Berghoff; A. Böhm; J. G. Branson; J.D. Burger; M. Capell; M. Cerrada; C.C. Chang; H. S. Chen; M. Chen; M. L. Chen; M.Y. Chen; R. Clare; E. Deffur; P. Duinker; Z. Y. Feng; H.S. Fesefeldt; D. G. Fong; M. Fukushima; D. Harting; T. Hebbeker; G. Herten; M.C. Ho; M.M. Ilyas; D.Z. Jiang; D. Kooijman; W. Krenz
Abstract We have used our measurements of final states from e+e− containing an isolated muon and a hadronic or electron shower to search for new spin 0 charged particles. We exclude (95% CL) a supersymmetric partner of the τ with a mass less than 14 GeV/c2. We obtain upper limits on the branching ratio to τvτ for charged Higgs particles or technipions with masses up to 14 GeV/c2. This disagrees with some technicolor model predictions.
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.
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.
Physics Letters B | 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; Hesheng 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. Fong; M. Fukushima; L. Garrido; R.D. Han; D. Harting; G. Herten
Abstract A study of τ-lepton production in the CMS energy region from 14 to 46.8 GeV at PETRA is reported. The cross section, the decay branching ratio into μν ν , and the electroweak parameters are determined with a total integrated luminosity of 115 pb −1 .
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 Letters | 1983
B. Adeva; D. P. Barber; U. Becker; J. Berdugo; G. Berghoff; A. Boehm; Jg Branson; Jd Burger; M. Capell; M. Cerrada; C. C. Chang; Hs Chen; Mingshui Chen; M. L. Chen; M. Chen; Y. S. Chu; R. Clare; E. Deffur; M. Demarteau; P. Duinker; Z. Y. Feng; H.S. Fesefeldt; D. G. Fong; M. Fukushima; D. Harting; T. Hebbeker; G. Herten; M.C. Ho; M.M. Ilyas; D.Z. Jiang
The results of a high-statistics study of inclusive muon spectra at PETRA are reported. Improved mass limits have been obtained for heavy quarks, heavy leptons, and charged Higgs particles. It is shown that the fragmentation properties of b quarks and c quarks are different, with the mean fragmentation variables = 0.75 +- 0.03 +- 0.06, = 0.46 +- 0.02 +- 0.05 and the average semileptonic branching ratio for the B and C hadrons BR(B) = (10.5 +- 1.5 +- 1.3)%, BR(C) = (11.5 +- 1.0 +- 1.7)%.
