We consider a rotating quark-antiquark (qq̄) pair in N = 4 thermal plasma. By using AdS/CFT correspondence, the properties of this system have been investigated. We study variation of rotating string radius at the boundary as a function of the tip of U-shape string and angular velocity of rotating meson. We also extend the results to the higher derivative corrections i.e. R2 and R4 which corresp...

We present a unified description of nuclear deep inelastic scattering (DIS) over the whole region 0 < x < 1 of the Bjorken variable. Our approach is based on a relativistically covariant formalism which uses analytical properties of quark correlators. In the laboratory frame it naturally incorporates two mechanisms of DIS: (I) scattering from quarks and antiquarks in the target and (II) product...

A phase transition in the nature of matter in the core of a neutron star, such as quark deconfinement or Bose condensation, can cause the spontaneous spin-up of a solitary millisecond pulsar. The spin-up epoch for our model lasts for 2 × 10 years or 1/50 of the spin-down time (Glendenning, Pei and Weber 1997).

In this work we study the Lepton Flavour Violating semileptonic τ decays: 1) τ → µP P with P P = π + π − , π 0 π 0 , K + K − , K 0 ¯ K 0 ; 2) τ → µP with P = π 0 , η 0 , η ′0 and 3) τ → µV with V = ρ 0 , φ 0. We work within the context of two constrained MSSM scenarios: the CMSSM and NUHM. A full SUSY one-loop computation is presented and the importance of the various contributions, the γ-, Z-,...

We quantify the limits on quark-antiquark mass differences imposed by the neutral kaon mass system. In particular, we find that an upper limit to the mass difference of 10 eV exists if mass differences across quark flavors are uncorrelated. We also find that such a small mass difference would be difficult to detect in upcoming antihydrogen experiments, both due to its small effect on the atomic...

Abstract. The effects of pions for vacuum polarization in background magnetic fields are considered. The effects of quark condensates is also briefly addresses. Although these effects are out of the measurement accuracy of laboratory experiments they may be relevant for gamma-ray burst propagation. In particular, for emissions from the center of the galaxy, we show that the mixing between the n...

It is shown that the quark–gluon interaction induced by instan-tons leads to the quark anomalous chromomagnetic moment. In the instanton-liquid model for the QCD vacuum, the chromomagnetic moment is µ a = − πf 2αs , where f is the packing fraction of instantons in the vacuum.

Hyperon ($Y$) mixing in neutron-star matter brings about a remarkable softening of the equation state (EoS) and maximum mass is reduced to value far less than $2{M}_{\ensuremath{\bigodot}}$. One idea avoid this ``hyperon puzzle neutron stars'' assume that many-body repulsions work universally for every kind baryons. The other take into account quark deconfinement phase transitions from hadronic...

Considering the magneto-hydrodynamic equations in a non-relativistic multi uid framework, we study the behavior of small amplitude perturbations in cold quark matter. Magneto-hydrodynamic equations, along with a suitable equation of state for the cold quark matter, are expanded using the reductive perturbation method. It is shown that in small amplitude approximation, such a medium should be co...