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Search Results: 1 - 10 of 554505 matches for " A. K. Alton "
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Search for light-to-heavy quark flavor changing neutral currents in $ν _μN$ and $\barν_μN$ scattering at the Tevatron
A. Alton
Physics , 2000, DOI: 10.1103/PhysRevD.63.012001
Abstract: We report on a search for flavor-changing neutral-currents (FCNC) in the production of heavy quarks in deep inelastic $\nu_{\mu}N$ and $\bar{\nu}% _{\mu}N$ scattering by the NuTeV experiment at the Fermilab Tevatron. This measurement, made possible by the high-purity NuTeV sign-selected beams, probes for FCNC in heavy flavors at the quark level and is uniquely sensitive to neutrino couplings of potential FCNC mediators. All searches are consistent with zero, and limits on the effective mixing strengths $% | V_{uc}| ^{2}$, $| V_{db}| ^{2}$, and $| V_{sb}| ^{2}$ are obtained.
Observation of neutral current charm production in $ν_μFe$ scattering at the Tevatron
A. Alton
Physics , 2000, DOI: 10.1103/PhysRevD.64.012002
Abstract: We report on the first observation of open charm production in neutral current deep inelastic neutrino scattering as seen in the NuTeV detector at Fermilab. The production rate is shown to be consistent with a pure gluon-$% Z^{0}$ boson production model, and the observed level of charm production is used to determine the effective charm mass. As part of our analysis, we also obtain a new measurement for the proton-nucleon charm production cross section at $\sqrt{s}=38.8$ GeV.
A state-insensitive, compensated nanofiber trap
C. Lacro?te,K. S. Choi,A. Goban,D. J. Alton,D. Ding,N. P. Stern,H. J. Kimble
Physics , 2011, DOI: 10.1088/1367-2630/14/2/023056
Abstract: Laser trapping and interfacing of laser-cooled atoms in an optical fiber network is an important capability for quantum information science. Following the pioneering work of Balykin et al. and Vetsch et al., we propose a robust method of trapping single Cesium atoms with a two-color state-insensitive evanescent wave around a dielectric nanofiber. Specifically, we show that vector light shifts (i.e., effective inhomogeneous Zeeman broadening of the ground states) induced by the inherent ellipticity of the forward-propagating evanescent wave can be effectively canceled by a backward-propagating evanescent wave. Furthermore, by operating the trapping lasers at the magic wavelengths, we remove the differential scalar light shift between ground and excited states, thereby allowing for resonant driving of the optical D2 transition. This scheme provides a promising approach to trap and probe neutral atoms with long trap and coherence lifetimes with realistic experimental parameters.
Recent structure function results from neutrino scattering at Fermilab
U. K. Yang,T. Adams,A. Alton,C. G. Arroyo,S. Avvakumov,L. de Barbaro,P. de Barbaro,A. O. Bazarko,R. H. Bernstein,A. Bodek et al
Physics , 2000,
Abstract: We report on the extraction of the structure functions F_2 and Delta xF_3 = xF_3(nu)-xF_3(nubar) from CCFR nu_mu-Fe and nubar_mu-Fe different ial cross sections. The extraction is performed in a physics model independent (PMI) way. This first measurement of Delta xF_3, which is useful in testing models of heavy charm production, is higher than current theoretical predictios. The ratio of the F_2 (PMI) values measured in nu_mu and mu scattering is in agreement (within 5%) with the NLO predictions using massive charm production schemes, thus resolving the long-standing discrepancy between the two sets of data. In addition, measurements of F_L (or, equivalently, R) and 2xF_1 are reported in the kinematic region where anomalous nuclear effects in R are observed at HERMES.
Extraction of R = sigma_L/sigma_T from CCFR nu_mu-Fe and nubar_mu-Fe differential cross sections
U. K. Yang,T. Adams,A. Alton,C. G. Arroyo,S. Avvakumov,L. de Barbaro,P. de Barbaro,A. O. Bazarko,R. H. Bernstein,A. Bodek
Physics , 2001, DOI: 10.1103/PhysRevLett.87.251802
Abstract: We report on the extraction of R=sigma_L/sigma_T from CCFR nu_mu-Fe and nubar_mu-Fe differential cross sections. The CCFR differential cross sections do not show the deviations from the QCD expectations that are seen in the CDHSW data at very low and very high x. R as measured in nu_mu scattering is in agreement with R as measured in muon and electron scattering. All data on R for Q^2 > 1 GeV^2 are in agreement with a NNLO QCD calculation which includes target mass effects. We report on the first measurements of R in the low x and Q^2 < 1 GeV^2 region (where an anomalous large rise in R for nuclear targets has been observed by the HERMES collaboration).
Efficient routing of single photons by one atom and a microtoroidal cavity
Takao Aoki,A. S. Parkins,D. J. Alton,C. A. Regal,Barak Dayan,E. Ostby,K. J. Vahala,H. J. Kimble
Physics , 2009, DOI: 10.1103/PhysRevLett.102.083601
Abstract: Single photons from a coherent input are efficiently redirected to a separate output by way of a fiber-coupled microtoroidal cavity interacting with individual Cesium atoms. By operating in an overcoupled regime for the input-output to a tapered fiber, our system functions as a quantum router with high efficiency for photon sorting. Single photons are reflected and excess photons transmitted, as confirmed by observations of photon antibunching (bunching) for the reflected (transmitted) light. Our photon router is robust against large variations of atomic position and input power, with the observed photon antibunching persisting for intracavity photon number 0.03 \lesssim n \lesssim 0.7.
Demonstration of a state-insensitive, compensated nanofiber trap
A. Goban,K. S. Choi,D. J. Alton,D. Ding,C. Lacro?te,M. Pototschnig,T. Thiele,N. P. Stern,H. J. Kimble
Physics , 2012, DOI: 10.1103/PhysRevLett.109.033603
Abstract: We report the experimental realization of an optical trap that localizes single Cs atoms ~215 nm from surface of a dielectric nanofiber. By operating at magic wavelengths for pairs of counter-propagating red- and blue-detuned trapping beams, differential scalar light shifts are eliminated, and vector shifts are suppressed by ~250. We thereby measure an absorption linewidth \Gamma/2\pi = 5.7 \pm 0.1 MHz for the Cs 6S1/2,F=4 - 6P3/2,F'=5 transition, where \Gamma/2\pi = 5.2 MHz in free space. Optical depth d~66 is observed, corresponding to an optical depth per atom d_1~0.08. These advances provide an important capability for the implementation of functional quantum optical networks and precision atomic spectroscopy near dielectric surfaces.
English versus Chinese: A Cross-Lingual Study of Community Question Answering Sites
Alton Y. K. Chua,Snehasish Banerjee
Lecture Notes in Engineering and Computer Science , 2013,
Abstract:
Aggregated Community Question Answering
Alton Y. K. Chua,Snehasish Banerjee
Lecture Notes in Engineering and Computer Science , 2013,
Abstract:
Rendezvous- A Social Web-based Application for Knowledge Sharing and Entertainment
Alton Y.K. Chua,Radhika Shenoy Balkunje,Kuiyu Chang
Lecture Notes in Engineering and Computer Science , 2012,
Abstract:
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