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Search Results: 1 - 10 of 307689 matches for " D. B. Cline "
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The Scientific Need for a Scalar/Higgs Factory
D. B. Cline
Physics , 2000, DOI: 10.1063/1.1336246
Abstract: The scalar sector of the electroweak theory can be probed by a mu^+mu^- collider S channel resonance machine. We give arguments for when such a machine may be needed and when this information could be obtained by the LHC detector. A very interesting case is the possibility that several scalar particles are in the same mass range for the supersymmetric Higgs bosons h, H, and A, which would definitely require such a machine. The Higgs factory could follow the construction of a neutrino factory.
Polarization in a Muon Collider
D. Cline,B. Norum,R. Rossmanith
Physics , 1996,
Abstract: In this paper the possibility of obtaining polarized beams in a high energy muon collider is discusssed
Constraints on Inelastic Dark Matter Signal using ZEPLIN-II Results
D. B. Cline,W. Ooi,H. Wang
Physics , 2009,
Abstract: There has been an increasing interest on the concept of Inelastic Dark Matter (iDM) - motivated in part by some recent data. We describe the constraints on iDM from the results of the two phase dark matter detector ZEPLIN-II, which has demonstrated strong background discrimination capabilities (>98%). Using previously published estimates of the ZEPLIN-II residual background, the iDM limits presented here exclude a significantly larger iDM parameter space than the limits derived without background subtraction. Moreover, assuming standard xenon quenching factor (qXe) of 0.19, our ZEPLIN-II limits strongly suggest the exclusion of iDM signal claims at >99% C.L., for Weakly Interacting Massive Particles (WIMPs) masses >100 GeV.
Exploring the Ultrahigh Energy Neutrino Universe
D. B. Cline,F. W. Stecker
Physics , 2000,
Abstract: Astronomy at the highest energies observed must be performed by studying neutrinos rather than photons because the universe is opaque to photons of these energies. By making observations of neutrinos with energies above 10 EeV one can deduce information about the distribution and cosmological history of cosmic rays which may have been accelerated to energies above 100 EeV. Very large fluxes of neutrinos at these energies which exhibit a hard spectrum would be evidence of a GUT phase transition or superheavy dark matter particles. Neutrinos at energies around a PeV may be produced in observable quantities in active galaxies from the acceleration and interactions of cosmic rays in the vicinity of massive black holes or in relativistic jets produced by these black holes. Cosmological gamma-ray bursts may also produce PeV neutrinos. Neutrinos at these energies may oscillate into tau neutrinos which can travel through the Earth by the process of regeneration and produce upward moving air-showers. Neutrinos of energies above of 1000 EeV can produce ultrahigh energy cosmic rays thorugh interactions with big-bang neutrinos, producing Z bosons. This "Z-burst" phenomenon can be used to study the mass and distribution of big-bang neutrinos.
A Neutrino-Factory Muon Storage Ring to Provide Beams for Multiple Detectors Around the World
D. B. Cline,Y. Fukui,A. Garren
Physics , 2000, DOI: 10.1063/1.1336259
Abstract: We briefly discuss the physics motivation for a neutrino factory with varying baseline distances of about 1000 to 9000 km. We describe the amount of non planarity of the storage ring required to service three or four detectors at once. A novel bowtie storage ring is described that could in part provide these beams; a preliminary lattice design is given. We give the space angles between the various detector locations and possible sites for neutrino factories. Finally we describe detectors at the Gran Sasso Laboratory and at a new laboratory near Carlsbad, NM to observe the neutrino interactions with wrong sign leptons.
Evidence for a Galactic Origin of Very Short Gamma Ray Bursts and Primordial Black Hole Sources
D. B. Cline,C. Matthey,S. Otwinowski
Physics , 2001, DOI: 10.1016/S0927-6505(02)00219-0
Abstract: We systematically study the shortest time duration gamma ray bursts and find unique features that are best interpreted as sources of a galactic origin. There is a significant angular asymmetry and the V/Vmax distribution provides evidence for a homogenous or Euclidean source distribution. We eview the arguments that primordial black hole evaporation can give such GRBs. The rate of events is consistent with a PBH origin if we assume on enhanced local density, as are the other distributions. We suggest further tests of this hypothesis.
Observations of giant outbursts from Cygnus X-1
S. Golenetskii,R. Aptekar,D. Frederiks,E. Mazets,V. Palshin,K. Hurley,T. Cline,B. Stern
Physics , 2002, DOI: 10.1086/378190
Abstract: We present interplanetary network localization, spectral, and time history information for 7 episodes of exceptionally intense gamma-ray emission from Cygnus X-1. The outbursts occurred between 1995 and 2003, with durations up to \~28000 seconds. The observed 15 - 300 keV peak fluxes and fluences reached 3E-7 erg /cm2 s, and 8E-4 erg / cm2 respectively. By combining the triangulations of these outbursts we derive an ~1700 square arcminute (3 sigma) error ellipse which contains Cygnus X-1 and no other known high energy sources. The outbursts reported here occurred both when Cyg X-1 was in the hard state as well as in the soft one, and at various orbital phases. The spectral data indicate that these outbursts display the same parameters as those of the underlying hard and soft states, suggesting that they represent another manifestation of these states.
Possible Physical Mechanisms in the Galaxy to Cause Homochiral Biomaterials for Life
David B. Cline
Symmetry , 2010, DOI: 10.3390/sym2031450
Abstract: The origin of homochirality in life remains a mystery that some believe is essential for life, and which may result from chiral symmetry breaking interactions with galactic organic material.
Recent results on the low mass dark matter WIMP controversy: 2011
David B. Cline
Physics , 2011,
Abstract: We review the confused situation concerning evidence for low-mass WIMPs. In the past one half year there have been new results concerning the existence of WIMPs at low mass including the new XENON 100, 100-day data, additional CDMS results, the publication of annual variation data from LVD and Borexino and new CoGeNT data. Along with the S2 analyses of the XENON 10 data we provide an overview of this situation. We discuss new results from 2011 here. We also discuss the origin of annual variations of signals in underground laboratories. This article is meant to be an update of recent experimental results. It is not a critical comparison of the claims of various experimental groups. Such critiques are made in public conferences and meetings. There is currently an intense discussion being carried out about the low mass WIMP region with many different viewpoints. We have little to say about this situation except that the scientific method usually insures the correct results will eventually surface.
Supernova II Neutrino Bursts and Neutrino Massive Mixing
David B. Cline
Physics , 2001,
Abstract: We describe the Neutrino Spectrum and detection for SN II sources. We discuss the effects of neutrino mixing in the SN II. A new analysis of SN1987A is described. We discuss the possible detection of the diffuse relic SN II flux. Finally we discuss a new detection concept, OMNIS, for Nu sub mu and Nu sub tau and detection and compare with other present and future SN detectors.
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