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The 798 Art Zone, the European Avant-Garde in ChinaZheng, Yalan, M.S. 28 October 2013 (has links)
No description available.
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D*dpi Coupling Constant In 2+1 Flavor Lattice QcdCan, Kadir Utku 01 September 2012 (has links) (PDF)
Developments in high-performance computing instruments and advancements in the numerical algorithms combined with lattice gauge theory make it possible to simulate Quantum Chromodynamics (QCD), the theory of strongly-interacting quarks and gluons, numerically at nearly physical light-quark masses. In this work we present our results for the $D^*Dpi$ coupling constant as simulated on $32^3 imes 64$, unquenched $2+1$-flavor lattices. We estimate the coupling at the chiral limit as $g_{D^*Dpi} = 16.23 pm 1.71$, which is in good agreement with its experimental value $g^{(exp)}_{D^*Dpi} = 17.9pm0.3pm1.9$ as obtained by CLEO II Collaboration.
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Study Of Neutrino Interactions In The Chorus ExperimentCuha, Volkan 01 November 2006 (has links) (PDF)
The emulsion target of the CHORUS detector was exposed to the
wide-band neutrino beam of the CERN SPS between the years 1994 and 1997. In total about 130.000 neutrino interactions were located in the nuclear emulsion target and fully reconstructed. Detailed DATA and Monte Carlo (MC) comparisons were done in order to test reliability of the detector simulation. There is reasonable agreement between DATA and MC. The ratio of deep inelastic neutral-current (NC) to the deep inelastic (DIS) charged-current(CC) $nu_{mu}$ interactions was measured to be frac{NC_{dis}}{CC_{dis}}=0.350pm0.003$. This measurement was compared with the previous measurements. Based on three double charm decays found in NC interactions we measured the ratio of double charm cross-section in NC $nu_{mu}$ interactions to be [ frac{sigma
(cbar{c}nu_mu)}{sigma_{NC}}=(3.37^{+3.06}_{-2.51}(stat.)pm
0.51(syst.))times 10^{-3}. ] One double charm decay has been observed in CC $nu_{mu}$ interactions the upper limit on associated charm production in $nu_{mu}$ CC interaction has been found to be [ frac{sigma cbar{c}mu^{-})}{sigma_{CC}}< / 9.69 times 10^{-4}. ] at 90% C.L.
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Qcd Sum Rules For The Anticharmed PentaquarkSarac, Yasemin 01 January 2007 (has links) (PDF)
For the anti-charmed pentaquark state with and without strangeness a QCD sum rule analysis, which is one of the nonperturbative approaches, is presented. For this purpose we employ pentaquark currents with and without strangeness, with two different current for each case. To refine the sum rules we also consider the DN continuum contribution in our analysis since this procedure is important to identify the signal of the pentaquark state. While the
sum rules for most of the currents are either non-convergent or dominated by the DN continuum, the one for the non-strange pentaquark current composed of two diquarks and an antiquark, is convergent and has a structure consistent with a positive parity pentaquark state after subtracting out the DN continuum contribution. Arguments are presented on the similarity between the result of the present analysis and that based on the constituent quark models, which predict more stable pentaquark states when the antiquark is heavy.
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Measurement Of Sm Electro-weak Parameters In Reactor Antineutrino-electron Scattering In Texono ExperimentDeniz, Muhammed 01 May 2007 (has links) (PDF)
In this thesis a search for electron type neutrino-electron scattering cross-section and Weinberg
Angle measurements were performed at KS Nuclear Power Station with 200 kg CsI(Tl) scintillating crystal detector located at a distance of 28 m from the 2.9 GW reactor core giving total flux of 6:52X10^12 cm^-2s^-1 in average at
the experimental site. New analysis techniques and background suppression methods were developed. In the region of 3-8 MeV a measurement of SM cross section of (1:235+-0.577) XR_SM and Weinberg Angle of 0:264 +-0.075
which is quite consistent with the SM value of 0.23120(15)were obtained. These are the best results with wold wide level sensitivities at untested low energy region by using reactor anti-neutrinos.
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Light Cone Qcd Sum Rules And Meson PhysicsKanik, Inanc 01 September 2008 (has links) (PDF)
In this thesis, we applied Light Cone QCD sum rules
(LCSR) to several problems in meson physics. Semileptonic B-> / eta l v decays are important to get
information on Cabibbo-Kobayashi-Maskawa (CKM) matrix elements. We
calculated form factors of this decay in LCSR frame. Our results
are confirmed by later studies and these similar studies had been
used for enhancing result on b to u quark transition matrix
element of CKM matrix by BaBar collaboration. We used LCSR method
also for calculating coupling constant of radiative
rho -> / eta photon decay since the analysis of the vector
particle to pseudoscalar particle radiative decay with eta and
eta' / mesons in final state can provide insights to the long
standing issue of the eta and eta' / mixing. Our result
g_{rho eta photon}=(1.4 ± / 0.2) is very close to experimental
value g_{ rho eta photon} = (1.42 ± / 0.12). We also calculated
magnetic moment of the rho meson in LCSR frame which is an
important parameter since it is strongly related to internal
structure of hadron. Our result 2.3 ± / 0.5 in units of
(e/2m_rho), is in better agreement with lattice QCD results
than traditional QCD sum rules. Quark contents of light scalar
mesons are still under debate and we analyzed phi -> / K
K decays which is important for understanding the quark content
of the f0 meson. Our final result is g_{phi KK} = 4.9 ± / 0.8
which is in well agreement with existing experimental result
g_{phi KK} = 4.8.
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Entanglement In The Relativistic Quantum MechanicsYakaboylu, Enderalp 01 February 2010 (has links) (PDF)
In this thesis, entanglement under fully relativistic settings are discussed. The thesis starts with a brief review of the relativistic quantum mechanics. In order to describe the effects of Lorentz transformations on the entangled states, quantum mechanics and special relativity are merged by construction of the unitary irreducible representations of Poincaré / group on the infinite dimensional Hilbert space of state vectors. In this framework, the issue of finding the unitary irreducible representations of Poincaré / group is reduced to that of the little group. Wigner rotation for the massive particles plays a crucial role due to its effect on the spin polarization directions. Furthermore, the physical requirements for constructing the correct relativistic spin operator is also studied. Then, the entanglement and Bell type inequalities are reviewed. The special attention has been devoted to two historical papers, by EPR in 1935 and by J.S. Bell in 1964. The main part of the thesis is based on the Lorentz transformation of the Bell states and the Bell inequalities on these transformed states. It is shown that entanglement is a Lorentz invariant quantity. That is, no inertial observer can see the entangled state as a separable one. However, it was shown that the Bell inequality may be satisfied for the Wigner angle dependent transformed entangled states. Since the Wigner rotation changes the spin polarization direction with the increased velocity, initial dichotomous operators can satisfy the Bell inequality for those states. By choosing the dichotomous operators taking into consideration the Wigner angle, it is always possible to show that Bell type inequalities can be violated for the transformed entangled states.
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Spinodal Instabilities In Symmetric Nuclear Matter Within A Nonlinear Relativistic Mean-field ApproachAcar, Fatma 01 August 2011 (has links) (PDF)
Spinodal instability mechanism and early development of density fluctuations
for symmetric nuclear matter at finite temperature are studied. A stochastic
extension of Walecka-type relativistic mean-field model including non-linear
self-interactions of scalar mesons with NL3 parameter set is employed in the
semi-classical approximation. The growth rates of unstable collective modes
are investigated below the normal density and at low temperatures. The system
exhibits most unstable behavior in longer wave lengths at baryon densities
&rho / B = 0.4 &rho / 0 , while most unstable behavior occurs in shorter wavelengths at
lower baryon densities &rho / B = 0.2 &rho / 0 . The unstable response of the system shifts
towards longer wavelengths with the increasing temperature at both densities.
The early growth of the density correlation functions are calculated, which provide
valuable information about the initial size of the condensation and the
average speed of condensing fragments. Furthermore, the relativistic results are
compared with Skyrme type non-relativistic calculations. Qualitatively similar
results are found in both non-relativistic and relativistic descriptions.
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Discovery Potential Of Quantum Black Holes In Add Model With The Cms DetectorGamsizkan, Halil 01 September 2011 (has links) (PDF)
With the long awaited start-up of the LHC, TeV scale physics is now in reach of the particles physicists to explore. There are many questions about the nature to be answered, and many more theories to be tested trying to answer them.
The ADD model of extra dimensions is one such model, written to address the large mass hi- erarchy between the two fundamental energy scales in nature, the electroweak and the Planck scales. ADD model predicts stronger gravity at sub-millimeter distance scales, which would then lead to an interesting physical object to be produced at proton collusions at the LHC: Tiny quantum black holes.
In this thesis we study the discovery potential of CMS for quantum black hole events for proton-proton collusions at sqrt(s) = 14 TeV. Our study details the trigger response of CMS, various criteria and methods for background rejection, affect of experimental uncertainties on measurements, for different model parameter values.
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The early development of Islamic fiqh in Kûfah with special reference to the works of Abû Yûsuf and Shaybânî /Ansari, Zafar Ishaq. January 1966 (has links)
In respect both of legal theory and technical legal thought, Kufians stood mid-way between ancient schools and Shâfi'i.
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