Physical sciences topic list of research papers
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Estimate of the chiral condensate in quenched lattice QCD
Abstract We determine the value of the quark condensate from quenched QCD simulations on the lattice in two ways: (i) by using the Gell-Mann–Oakes–Renner (GMOR) formula; (ii) by comparing the OPE prediction for the Goldstone pole contribution to the ...
2004 / Damir Bećirević, Vittorio Lubicz -
Cosmological constraints on a power law universe
Abstract Linearly coasting cosmology is comfortably concordant with a host of cosmological observations. It is surprisingly an excellent fit to SNe Ia observations and constraints arising from age of old quasars. In this Letter we highlight the...
2005 / Geetanjali Sethi, Abha Dev, Deepak Jain -
Instanton induced quark dynamics and the pentaquark
Abstract We analyze the existence of the exotic Θ + from the perspective of instanton induced quark dynamics. The 't Hooft interaction gives strong attraction in specific channels of the triquark ud s ...
2004 / N.I. Kochelev, H.-J. Lee, V. Vento -
A realistic world from intersecting D6-branes
Abstract We describe a three-family Pati–Salam model from intersecting D6-branes in type IIA string theory on the T 6 / ...
2008 / Ching-Ming Chen, Tianjun Li, V.E. Mayes, Dimitri V. Nanopoulos -
Observation of non-exponential orbital electron capture decays of hydrogen-like 140Pr and 142Pm ions
Abstract We report on time-modulated two-body weak decays observed in the orbital electron capture of hydrogen-like 140Pr59+ and 142Pm60+ ions coasting in an ion storage ring. Using non-destructive single ion, time-resolved Schottky mass...
2008 / Yu.A. Litvinov, F. Bosch, N. Winckler, D. Boutin, H.G. Essel, et al. -
QCD sum rule study of the masses of light tetraquark scalar mesons
Abstract We study the low-lying scalar mesons of light u, d, s flavors in the QCD sum rule. Having all possible combinations of tetraquark currents in the local form, QCD sum rule analysis has been carefully performed. We found that using the...
2007 / Hua-Xing Chen, Atsushi Hosaka, Shi-Lin Zhu -
Observational implications of cosmological event horizons
Abstract In a universe dominated by a small cosmological constant or by eternal dark energy with equation of state w < − 1 / ...
2004 / Nemanja Kaloper, Matthew Kleban, Lorenzo Sorbo -
Uncertainty of polarized gluon distribution from prompt photon production
Abstract Constraint of prompt photon data on the polarized gluon distribution is discussed in terms of uncertainty estimation for polarized parton distribution functions (PDFs). By comparing uncertainty of the double spin asymmetry ...
2004 / M. Hirai -
Localization of matters on thick branes
Abstract We study localization of various spin fields on flat thick branes, two different models are considered. For spin 0 scalar field, the massless zero mode is found to be normalizable on both the thick brane models. Spin 1 vector field cannot...
2009 / Jun Liang, Yi-Shi Duan -
Global systematics of the Wigner energy
Abstract Following Zeldes, double-beta decay Q values are used as a filter for extracting symmetry energy and Wigner energy coefficients across the full range of nuclei, from A = ...
2008 / Michael W. Kirson -
Isospin mixing of narrow pentaquark states
Abstract Interpreting the recently discovered narrow exotic baryons as pentaquark states, we discuss, along an old argument of ours, the isospin mixing occurring within the two doublets of Q = ...
2004 / G.C. Rossi, G. Veneziano -
Noninvariant zeta-function regularization in quantum Liouville theory
Abstract We consider two possible zeta-function regularization schemes of quantum Liouville theory. One refers to the Laplace–Beltrami operator covariant under conformal transformations, the other to the naive noninvariant operator. The first...
2007 / Pietro Menotti -
Importance of nuclear effects in the measurement of neutrino oscillation parameters
Abstract We investigate how models for neutrino–nucleus cross sections based on different assumptions for the nuclear dynamics affect the forecasted sensitivities to neutrino oscillation parameters at future neutrino facilities. We limit ourselves...
2011 / Enrique Fernandez Martinez, Davide Meloni -
On the phase diagram of QCD with small isospin chemical potential
Abstract The regime of small isospin chemical potential in QCD is investigated. Using the phase quenched partition function in the ϵ-regime an expression for the chiral condensate is given, which is studied in the temperature isospin chemical...
2009 / Juliane Mirsa Møller -
Beam-spin asymmetries in the azimuthal distribution of pion electroproduction
Abstract A measurement of the beam-spin asymmetry in the azimuthal distribution of pions produced in semi-inclusive deep-inelastic scattering off protons is presented. The measurement was performed using the HERMES spectrometer with a hydrogen gas...
2007 / A. Airapetian, Z. Akopov, M. Amarian, A. Andrus, E.C. Aschenauer, et al. -
Direct test of the MSW effect by the solar appearance term in beam experiments
Abstract We discuss if one can verify the MSW effect in neutrino oscillations at a high confidence level in long-baseline experiments. We demonstrate that for long enough baselines at neutrino factories, the matter effect sensitivity is not...
2005 / Walter Winter -
Particle acceleration on the background of the Kerr–Taub–NUT spacetime
Abstract We study the collision of two particles with the different rest masses moving in the equatorial plane of a Kerr–Taub–NUT spacetime and get the center-of-mass (CM) energy for the particles. We find that the CM energy depends not only on the...
2011 / Changqing Liu, Songbai Chen, Chikun Ding, Jiliang Jing -
Beta-decay half-lives at the N=28 shell closure
Abstract Measurements of the beta-decay half-lives of neutron-rich nuclei (MgAr) in the vicinity of the N=28 shell closure are reported. Some 22 half-lives have been determined, 12 of which for the first time. Particular emphasis is placed on the...
2004 / S. Grévy, J.C. Angélique, P. Baumann, C. Borcea, A. Buta, et al. -
N-flation from multiple DBI type actions
Abstract In this Letter we present a new inflationary model composed of multiple scalar fields where each of them has its own DBI action. We show that the dependence of the e-folding number and of the curvature perturbation on the number of fields...
2009 / Yi-Fu Cai, Wei Xue -
Are galaxies extending?
Abstract It is suggested that the recently observed size evolution of very massive compact galaxies in the early universe can be explained, if dark matter is in Bose–Einstein condensate. In this model the size of the dark matter halos and galaxies...
2009 / Jae-Weon Lee