Supersymmetry, or SUSY, is one of the proposed extensions to Standard Model, representing a solution some its limitations, such as hierarchy problem. It introduces new particle states which may be produced at ATLAS experiment, has been taking data $$\sqrt{s}=13$$ TeV Large Hadron Collider (LHC). Due existing constraints on value masses strongly coupled SUSY particles (or ‘‘sparticles’’), electr...

Heavy-hadron chiral perturbation theory (HHχPT) is applied to the decays of the even-parity charmed strange mesons, Ds0(2317) and Ds1(2460). Heavy-quark spin symmetry predicts the branching fractions for the three electromagnetic decays of these states to the ground states Ds and D s in terms of a single parameter. The resulting predictions for two of the branching fractions are significantly h...

Topcolor–assisted technicolor provides a dynamical explanation for electroweak and flavor symmetry breaking and for the large mass of the top quark without unnatural fine tuning. A major challenge is to generate the observed mixing between heavy and light generations while breaking the strong topcolor interactions near 1TeV. I argue that these phenomena, as well as electroweak symmetry breaking...

Abstract We investigate QCD effects in the production of a single slepton at hadron colliders in the Minimal Supersymmetric Standard Model without R-parity. We calculate the total cross sections and the transverse momentum distributions at next-to-leading order in QCD. The NLO corrections enhance the total cross sections and decrease the dependence of the total cross sections on the factorizati...

Studies of the spin and parity quantum numbers of the Higgs boson in the WW ∗→ eνμν final state are presented, based on proton–proton collision data collected by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb−1 at a centre-ofmass energy of √ s = 8 TeV. The Standard Model spinparity JCP = 0++ hypothesis is compared with alternative hypothese...

An exciting new era in flavour physics has just begun with the start of the Large Hadron Collider (LHC). The LHCb (where b stands for beauty) experiment, designed specifically to search for new phenomena in quantum loop processes and to provide a deeper understanding of matter-antimatter asymmetries at the most fundamental level, is producing many new and exciting results. It gives me great ple...

We discuss the application of the permutation group SN to a few problems in hadron physics. In Ref. [11] a method was proposed for matching a quark model Hamiltonian onto the effective Hamiltonian of the 1/Nc expansion, which makes use of the transformation properties of the states and operators under SN . This method is used in [13] to obtain information about the spinflavor structure of the q...

We review the current status of the exotic pentaquark baryons. After a brief look at experiments of both positive and negative results, we discuss theoretical methods to study the structure and reactions for the pentaquarks. First we introduce the quark model and the chiral soliton model, where we discuss the relation of mass spectrum and parity with some emphasis on the role of chiral symmetry...

By current theoretical understanding, spontaneous chiral symmetry breaking enhances the quark masses in the infrared, and thus generates most of the visible mass in our universe, i. e. the mass of the nucleons, while simultaneously removing chiral symmetry from the lowest states of the light hadron spectrum. We first show that three-quark states naturally group into quartets (with two states of...

In $R$-parity-violating supersymmetry the lightest neutralino can be very light, even massless. For masses in range $500\text{ }\text{ }\mathrm{MeV}\ensuremath{\lesssim}{m}_{{\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{0}}\ensuremath{\lesssim}4.5\text{ }\mathrm{GeV}$ produced hadron collisions from rare meson decays via an coupling, and subsequently decay to a lighter charged lepton. Du...