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Karyan G.,Alikhanyan National Science Laboratory
EPJ Web of Conferences | Year: 2014

The HERMES collaboration has measured charge-separated pion and kaon multiplicities in semi-inclusive deep-inelastic scattering using a 27.6? GeV electron or positron beam scattering off a hydrogen or deuterium target. The results are presented as functions of the Bjorken variable xB, the negative squared four-momentum transfer Q2, a hadron fractional energy z and the hadron's transverse momentum. These data will be very useful to understand the quark-fragmentation process in deep-inelastic hadron electro-production and will serve as crucial input in the understanding of charge and flavour separated fragmentation functions. Furthermore, it provides important information on the transverse-momentum dependence of hadron production. © Owned by the authors, published by EDP Sciences, 2014. Source


Altsybeev I.G.,Joint Institute for Nuclear Research | Zarubin A.V.,Joint Institute for Nuclear Research | Konoplyanikov V.F.,Gomel State University | Tumasyan A.R.,Alikhanyan National Science Laboratory | Shmatov S.V.,Joint Institute for Nuclear Research
Physics of Particles and Nuclei Letters | Year: 2012

The absolute scale of jet energy set in a CMS experiment using the W mass constraint in tt̄ events with W → qq̄ decay is studied. The main effects leading to systematic shifts in the jet-energy scale are identified. Estimations of these shifts are given. © 2012 Pleiades Publishing, Ltd. Source


Izmailian N.S.,Alikhanyan National Science Laboratory | Izmailian N.S.,Academia Sinica, Taiwan | Rojas O.,Federal University of Lavras | De Souza S.M.,Federal University of Lavras
Physica A: Statistical Mechanics and its Applications | Year: 2012

We propose a general method by which a spin-S is decomposed into spins less than S. We have obtained the exact mapping between spin S=pM-12 and a cluster of M spins σ=p-12, where p and M are positive integers. We have discussed the possible applications of such transformations. In particular we have shown how a general d+1 dimensional spin-p-12 model with general interactions can be reduced to a d-dimensional spin-S model with S= pM-12. © 2011 Elsevier B.V. All rights reserved. Source


Gevorgyan A.H.,Yerevan State University | Oganesyan K.B.,Alikhanyan National Science Laboratory
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2011

Specific features of the defect modes of cholesteric liquid crystals (CLCs) with an isotropic defect, as well as their photonic density of states, Q factor, and emission, have been investigated. The effect of the thicknesses of the defect layer and the system as a whole, the position of the defect layer, and the dielectric boundaries on the features of the defect modes have been analyzed. It is shown that when the CLC layer is thin the density of states and emission intensity are maximum for the defect mode, whereas when the CLC layer is thick, these peaks are observed at the edges of the photonic band gap. Similarly, when the gain is low, the density of states and emission intensity are maximum for the defect mode, whereas at high gains these peaks are also observed at the edges of the photonic band gap. The possibilities of low-threshold lasing and obtaining high-Q microcavities have been investigated. © 2011 Pleiades Publishing, Ltd. Source


Izmailian N.S.,Academia Sinica, Taiwan | Izmailian N.S.,Alikhanyan National Science Laboratory | Kenna R.,Coventry University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2011

We analyze the partition function of the dimer model on an M×N triangular lattice wrapped on a torus obtained by Fendley, Moessner, and Sondhi. From a finite-size analysis we have found that the dimer model on such a lattice can be described by a conformal field theory having a central charge c=-2. The shift exponent for the specific heat is found to depend on the parity of the number of lattice sites N along a given lattice axis: e.g., for odd N we obtain the shift exponent λ=1, while for even N it is infinite (λ=). In the former case, therefore, the finite-size specific-heat pseudocritical point is size dependent, while in the latter case it coincides with the critical point of the thermodynamic limit. © 2011 American Physical Society. Source

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