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Search Results: 1 - 10 of 12257 matches for " TAGX Collaboration "
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Subthreshold rho^0 photoproduction on 3He
TAGX Collaboration,M. A. Kagarlis,Z. Papandreou,G. M. Huber,G. J. Lolos,A. Shinozaki,E. J. Brash,F. Farzanpay,M. Iurescu,A. Weinerman,G. Garino,K. Maruyama,O. Konno,K. Maeda,T. Terasawa,H. Yamazaki,T. Emura,H. Hirosawa,K. Niwa,H. Yamashita,S. Endo,K. Miyamoto,Y. Sumi,A. Leone,R. Perrino,T. Maki,A. Sasaki,J. C. Kim
Physics , 1998, DOI: 10.1103/PhysRevC.60.025203
Abstract: A large reduction of the rho^0 mass in the nuclear medium is reported, inferred from dipion photoproduction spectra in the 1 GeV region, for the reaction 3He(gamma,pi+ pi-)X with a 10% duty factor tagged-photon beam and the TAGX multi-particle spectrometer. The energy range covered (800 < E(gamma) < 1120 MeV) lies mostly below the free rho^0 production threshold, a region which is believed sensitive to modifications of light vector-meson properties at nuclear-matter densities. The rho^0 masses extracted from the MC fitting of the data, m*(rho^0) = 642 +/- 40, 669 +/- 32, and 682 +/- 56 MeV/c^2 for E(gamma) in the 800-880, 880-960, and 960-1040 MeV regions respectively, are independently corroborated by a measured, assumption-free, kinematical observable. This mass shift, far exceeding current mean-field driven theoretical predictions, may be suggestive of rho^0 decay within the range of the nucleonic field.
A Cross-correlation method to search for gravitational wave bursts with AURIGA and Virgo
AURIGA Collaboration,Virgo Collaboration
Physics , 2008, DOI: 10.1088/0264-9381/25/11/114046
Abstract: We present a method to search for transient GWs using a network of detectors with different spectral and directional sensitivities: the interferometer Virgo and the bar detector AURIGA. The data analysis method is based on the measurements of the correlated energy in the network by means of a weighted cross-correlation. To limit the computational load, this coherent analysis step is performed around time-frequency coincident triggers selected by an excess power event trigger generator tuned at low thresholds. The final selection of GW candidates is performed by a combined cut on the correlated energy and on the significance as measured by the event trigger generator. The method has been tested on one day of data of AURIGA and Virgo during September 2005. The outcomes are compared to the results of a stand-alone time-frequency coincidence search. We discuss the advantages and the limits of this approach, in view of a possible future joint search between AURIGA and one interferometric detector.
EROS and MACHO Combined Limits on Planetary Mass Dark Matter in the Galactic Halo
EROS Collaboration,MACHO Collaboration
Physics , 1998, DOI: 10.1086/311355
Abstract: The EROS and MACHO collaborations have each published upper limits on the amount of planetary mass dark matter in the Galactic Halo obtained from gravitational microlensing searches. In this paper the two limits are combined to give a much stronger constraint on the abundance of low mass MACHOs.
Measurement of pseudorapidity distributions of charged particles in proton-proton collisions at sqrt(s) = 8 TeV by the CMS and TOTEM experiments
The CMS collaboration,The TOTEM Collaboration
Physics , 2014, DOI: 10.1140/epjc/s10052-014-3053-6
Abstract: Pseudorapidity (eta) distributions of charged particles produced in proton-proton collisions at a centre-of-mass energy of 8 TeV are measured in the ranges abs(eta) < 2.2 and 5.3 < abs(eta) < 6.4 covered by the CMS and TOTEM detectors, respectively. The data correspond to an integrated luminosity of 45 inverse microbarns. Measurements are presented for three event categories. The most inclusive category is sensitive to 91-96% of the total inelastic proton-proton cross section. The other two categories are disjoint subsets of the inclusive sample that are either enhanced or depleted in single diffractive dissociation events. The data are compared to models used to describe high-energy hadronic interactions. None of the models considered provide a consistent description of the measured distributions.
Muon lifetime and muon capture
MuCAP Collaboration,MuLAN Collaboration
Physics , 2004,
Abstract: We present an introduction to the MuLAN and MuCAP experiments at PSI, which aim at high precision determinations of two fundamental Weak Interactions parameters: the Fermi constant $G_{F}$ and the induced pseudoscalar form factor $g_{p}$, respectively.
Full-Sky Analysis of Cosmic-Ray Anisotropy with IceCube and HAWC
The HAWC Collaboration,The IceCube Collaboration
Physics , 2015,
Abstract: During the past two decades, experiments in both the Northern and Southern hemispheres have observed a small but measurable energy-dependent sidereal anisotropy in the arrival direction distribution of galactic cosmic rays. The relative amplitude of the anisotropy is $10^{-4} - 10^{-3}$. However, each of these individual measurements is restricted by limited sky coverage, and so the pseudo-power spectrum of the anisotropy obtained from any one measurement displays a systematic correlation between different multipole modes $C_\ell$. To address this issue, we present the preliminary status of a joint analysis of the anisotropy on all angular scales using cosmic-ray data from the IceCube Neutrino Observatory located at the South Pole ($90^\circ$ S) and the High-Altitude Water Cherenkov (HAWC) Observatory located at Sierra Negra, Mexico ($19^\circ$ N). We describe the methods used to combine the IceCube and HAWC data, address the individual detector systematics and study the region of overlapping field of view between the two observatories.
ICRC 2015 proceedings: First combined search for neutrino point-sources in the Southern Sky with the ANTARES and IceCube neutrino telescopes
ANTARES Collaboration,IceCube Collaboration
Physics , 2015,
Abstract: A search for cosmic neutrino point-like sources using the ANTARES and IceCube neutrino telescopes over the Southern Hemisphere is presented. The ANTARES data was collected between January 2007 and December 2012, whereas the IceCube data ranges from April 2008 to May 2011. Clusters of muon neutrinos over the diffusely distributed background have been looked for by means of an unbinned maximum likelihood maximisation. This method is used to search for a localised excess of events over the whole Southern Sky assuming an $E^{-2}$ source spectrum. A search over a pre-selected list of candidate sources has also been carried out for different source assumptions: spectral indices of 2.0 and 2.5, and energy cutoffs of 1 PeV, 300 TeV and 100 TeV. No significant excess over the expected background has been found, and upper limits for the candidate sources are presented compared to the individual experiments.
First real time detection of Be7 solar neutrinos by Borexino
Borexino Collaboration
High Energy Physics - Phenomenology , 2007, DOI: 10.1016/j.physletb.2007.09.054
Abstract: This paper reports a direct measurement of the Be7 solar neutrino signal rate performed with the Borexino low background liquid scintillator detector. This is the first real-time spectral measurement of sub-MeV solar neutrinos. The result for 0.862 MeV Be7 is 47 +- 7 (stat} +- 12 (sys} counts/(day x 100 ton), consistent with predictions of Standard Solar Models and neutrino oscillations with LMA-MSW parameters.
Preliminary Results from MINOS on Muon Neutrino Disappearance Based on an Exposure of 2.5x10^20 120 GeV Protons on the NuMI Target
MINOS Collaboration
High Energy Physics - Phenomenology , 2007,
Abstract: Updating our previous measurements with new data and analysis modifications, we report preliminary results on the energy-dependent deficit of muon neutrinos from the Fermilab NuMI beam as observed with the MINOS Far Detector located 735 km away in the Soudan Underground Laboratory. From an exposure of 2.50x10^20 protons on target, we observe 563 charged-current nu_mu interaction candidates in the Far Detector, where 738+/-30 events are expected in the absence of neutrino oscillations. We have analyzed these data assuming two-flavor nu_mu to nu_tau oscillations. From a simultaneous fit to the reconstructed nu_mu energy spectra obtained during two running periods we obtain the neutrino squared-mass difference Delta m_{32}^2 = (2.38 +0.20/-0.16) x 10^-3 eV^2/c^4 with errors at 68% confidence level (CL), and mixing angle sin^2(2 theta_23) > 0.84 at 90% CL. The uncertainties and confidence intervals include both statistical and systematic errors. All results and plots presented here are preliminary.
Unexplained Excess of Electron-Like Events From a 1-GeV Neutrino Beam
MiniBooNE Collaboration
High Energy Physics - Phenomenology , 2008, DOI: 10.1103/PhysRevLett.102.101802
Abstract: The MiniBooNE Collaboration observes unexplained electron-like events in the reconstructed neutrino energy range from 200 to 475 MeV. With $6.46 \times 10^{20}$ protons on target, 544 electron-like events are observed in this energy range, compared to an expectation of $415.2 \pm 43.4$ events, corresponding to an excess of $128.8 \pm 20.4 \pm 38.3$ events. The shape of the excess in several kinematic variables is consistent with being due to either $\nu_e$ and $\bar \nu_e$ charged-current scattering or to $\nu_\mu$ neutral-current scattering with a photon in the final state. No significant excess of events is observed in the reconstructed neutrino energy range from 475 to 1250 MeV, where 408 events are observed compared to an expectation of $385.9 \pm 35.7$ events.
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