Peter Rowson

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We report on a search for neutrinoless double-beta decay of 136Xe with EXO-200. No signal is observed for an exposure of 32.5 kg yr, with a background of ∼1.5×10(-3)  kg(-1) yr(-1)  keV(-1) in the ±1σ region of interest. This sets a lower limit on the half-life of the neutrinoless double-beta decay T(1/2)(0νββ)(136Xe)>1.6×10(25)  yr (90% C.L.),(More)
Many extensions of the standard model of particle physics suggest that neutrinos should be Majorana-type fermions-that is, that neutrinos are their own anti-particles-but this assumption is difficult to confirm. Observation of neutrinoless double-β decay (0νββ), a spontaneous transition that may occur in several candidate nuclei, would verify the Majorana(More)
J. B. Albert,1 M. Auger,2 D. J. Auty,3 P. S. Barbeau,4 E. Beauchamp,5 D. Beck,6 V. Belov,7 C. Benitez-Medina,8 J. Bonatt,9,4 M. Breidenbach,10 T. Brunner,4 A. Burenkov,7 G. F. Cao,11 C. Chambers,8 J. Chaves,4 B. Cleveland,5,* S. Cook,8 A. Craycraft,8 T. Daniels,9 M. Danilov,7 S. J. Daugherty,1 C. G. Davis,12 J. Davis,4 R. DeVoe,4 S. Delaquis,2 A. Dobi,12 A.(More)
E. Conti1,2†, R. DeVoe, G. Gratta, T. Koffas, S. Waldman, J. Wodin, D. Akimov, G. Bower, M. Breidenbach, R. Conley, M. Danilov, Z. Djurcic, A. Dolgolenko, C. Hall, A. Odian, A. Piepke, C.Y. Prescott, P.C. Rowson, K. Skarpaas, J-L. Vuilleumier, K. Wamba, O. Zeldovich 1 Physics Department, Stanford University, Stanford CA, USA 2 Stanford Linear Accelerator(More)
We present final measurements of the Z boson-lepton coupling asymmetry parameters Ae, Aμ, and Aτ with the complete sample of polarized Z bosons collected by the SLD detector at the SLAC Linear Collider. From the left-right production and decay polar angle asymmetries in leptonic Z decays we measure Ae = 0:1544 0:0060, Aμ = 0:142 0:015, and Aτ = 0:136 0:015.(More)
J.B. Albert, P.S. Barbeau, D. Beck, V. Belov, M. Breidenbach, T. Brunner, 7 A. Burenkov, G.F. Cao, C. Chambers, B. Cleveland, ∗ M. Coon, A. Craycraft, T. Daniels, M. Danilov, S.J. Daugherty, C.G. Davis, † J. Davis, S. Delaquis, A. Der Mesrobian-Kabakian, R. DeVoe, J.S. Dı́az, T. Didberidze, J. Dilling, A. Dolgolenko, M.J. Dolinski, M. Dunford, W. Fairbank(More)
J. B. Albert, D. J. Auty, P. S. Barbeau, E. Beauchamp, D. Beck, V. Belov, C. Benitez-Medina, M. Breidenbach, T. Brunner, A. Burenkov, G. F. Cao, C. Chambers, J. Chaves, B. Cleveland, M. Coon, A. Craycraft, T. Daniels, M. Danilov, S. J. Daugherty, C. G. Davis, J. Davis, R. DeVoe, S. Delaquis, T. Didberidze, A. Dolgolenko, M. J. Dolinski, M. Dunford, W.(More)
In 1992, L.G. Levchuk noted that the asymmetries measured in MMller scattering polarimeters could be signiicantly aaected by the intrinsic momenta of the target electrons. This eeect is largest in devices with very small acceptance or very high resolution in laboratory scattering angle. We use a high resolution po-larimeter in the linac of the polarized(More)
We present the first study of rapidity gaps in ee annihilations, using Z decays collected by the SLD experiment at SLAC. Our measured rapidity gap spectra fall exponentially with increasing gap size over five decades, and we observe no anomalous class of events containing large gaps. This supports the interpretation of the large-gap events measured in pp(More)