72 Works

Higgs boson production and couplings with the ATLAS detector.

Fernando Barreiro
I briefly review the status of Higgs boson production and couplings with the ATLAS detector at the LHC.

Heavy quarkonium production at the LHC in the framework of NRQCD and parton Reggeization approach.

Maxim Nefedov & Vladimir Saleev
Heavy quarkonium production in the framework of the nonrelativistic quantum chromodynamics and leading order of the parton Reggeization approach at the Tevatron and LHC Colliders is discussed. The new results, which are reviewed in this report, include the comparison with recent data on $\chi_{c1,2}$ production from ATLAS Collaboration and special discussion of heavy quarkonium polarization issues in the considered framework.

From the LHC to a future lepton collider.

Kirill Melnikov
I discuss the complementarity of top quark physics that can be studied at the LHC and at a future lepton collider.

The ZFITTER homepage (June 25, 2014)

Tord Riemann

Search for rare top quark decays.

Bruno Galhardo
Contribution to Proceedings

Probing QCD parameters with top-quark data.

Sebastian Naumann-Emme
Results from inclusive and differential measurements of the production cross sections for top quarks in proton-proton collisions at center-of-mass energies of 7 and 8~TeV are compared to predictions at next-to-leading and next-to-next-to-leading order in perturbative Quantum Chromodynamics. From these studies, constraints on the top-quark mass, the strong coupling constant, and on parton distribution functions are determined.

The ZFITTER homepage (June 25, 2014)

Tord Riemann

Spectroscopy and Regge Trajectories of Heavy Quarkonia.

D. Ebert, R. N. Faustov & V. O. Galkin
The mass spectra of charmonia and bottomonia are calculated in the framework of the relativistic quark model. The Regge trajectories of heavy quarkonia are constructed. All daughter trajectories are almost linear and parallel, while parent trajectories exhibit some nonlinearity. Such nonlinearity occurs only in the vicinity of ground states and few lowest excitations and is more pronounced for bottomonia, while it is only marginal for charmonia. The obtained results are compared with available experimental data,...

The Latest Results of the ATLAS Experiment on Heavy Quark Physics.

Stano Tokar
The latest experimental results obtained by the ATLAS Collaboration using the data produced in $pp$ collisions at $\sqrt{s} =$ 7 and 8~TeV are shown. The data were collected by the ATLAS detector in 2011 (7 TeV) and 2012 (8 TeV) with the integrated luminosity of 4.9~fb$^{-1}$ and 21~fb$^{-1}$, respectively. The main emphasis is on the top and bottom quark physics but the Higgs boson physics and searches of physics beyond the Standard Model are also...

Measurement of the longitudinal polarization of the top quark in top-antitop events with the ATLAS experiment..

Samuel Hamilton
Contribution to Proceedings

Technical Design Report: Scientific Instrument High Energy Density Physics (HED)

Motoaki Nakatsutsumi, Karen Appel, Gerd Priebe, Ian Thorpe, Alexander Pelka, Bruno Muller & Thomas Tschentscher
This technical design report (TDR) of the High Energy Density Physics scientific instrument (HED instrument) at the European XFEL outlines the scientific and technological requirements for the various subsystems and describes the technical realization of the instrument chosen to match these requirements.The scientific requirements have been extracted from a range of proposed scientific applications at HED. Most of these applications had been discussed in the past years as the core of the scientific activity at...

Light-Cone Distribution Amplitudes of Bottom Baryons.

Alexander Parkhomenko
A discussion of the three-quark light-cone distribution amplitudes (LCDAs) for the ground state heavy baryons with the spin-parities $J^P = 1/2^+$ and $J^P = 3/2^+$ in QCD in the heavy-quark limit is presented. Simple models for the bottom-baryon distribution amplitudes are analyzed with account of their scale dependence.

Measurement of the top-quark mass in all-jets $\mathbf{t\bar t}$ events in pp collisions at 7 TeV.

Eike Schlieckau
Contribution to Proceedings

The rise and fall of the fourth quark-lepton generation.

M. I. Vysotsky
The existence of the fourth quark-lepton generation is not excluded by the electroweak precision data. However, the recent results on the 126 GeV higgs boson production and decay do not allow an extra generation at least as far as the perturbation theory can be used.

Proceedings of the Helmholtz International Summer School Physics of Heavy Quarks and Hadrons, Dubna, July, 15-28 2013.

Ahmed Ali, Yury Bystritskiy & Mikhail Ivanov
Proc. of HQ2013; DESY-PROC-2013-03; ISSN 1435-8077

Relativistic Corrections to Pair Charmonium Production at the LHC.

A. P. Martynenko & A. M. Trunin
On the basis of perturbative QCD and relativistic quark model we calculate relativistic and bound state corrections to processes of a pair $S$-wave charmonium production at~the~LHC. The obtained result for $J/\psi$ pair production at the energy $\sqrt S=7$~TeV lies below the experimental value measured by LHCb collaboration. In the case of $\eta_c$ pair the examined effects decrease total nonrelativistic cross section more than two times and on 20 percents in the rapidity region of LHCb...

CP Violation in D meson Decays.

Pietro Santorelli
We discuss the direct CP violation in the singly Cabibbo suppressed two body decays of the neutral D mesons. Ascribing the large SU(3) violations to the final state interactions one gets large strong phase differences necessary for substantial direct CP violation. While the absolute value of the CP violating asymmetries depend on the uncertain strength of the penguin contribution, we predict an asymmetry for the decays into charged pions more than twice as large and...

The scalar mesons in multi-channel $\pi\pi$ scattering and decays of the $\psi$ and $\Upsilon$ families.

Yurii S. Surovtsev, Petr Bydzovsky, Thomas Gutsche, Robert Kaminski, Valery E. Lyubovitskij & Miroslav Nagy
The $f_0$ mesons are studied in a combined analysis of data on isoscalar S-wave processes $\pi\pi\to\pi\pi,K\overline{K},\eta\eta$ and on decays $J/\psi\to\phi(\pi\pi, K\overline{K})$, $\psi(2S)\to J/\psi(\pi\pi)$ and $\Upsilon(2S)\to\Upsilon(1S)\pi\pi$ from the Argus, Crystal Ball, CLEO, CUSB, DM2, Mark~II, Mark~III, and BESIII Collaborations. The method of analysis, based on analyticity and unitarity and using an uniformization procedure, is set forth with some details. Some spectroscopic implications from results of the analysis are discussed.

Bimodality Phenomenon in Finite and Infinite Systems Within an Exactly Solvable Statistical Model.

V. V. Sagun, A. I. Ivanytskyi, K. A. Bugaev & D. R. Oliinychenko
We present a few explicit counterexamples to the widely spread belief about an exclusive role of the bimodal nuclear fragment size distributions as the first order phase transition signal. In thermodynamic limit the bimodality may appear at the supercritical temperatures due to the negative values of the surface tension coefficient. Such a result is found within a novel exactly solvable formulation of the simplified statistical multifragmentation model based on the virial expansion for a system...

Rare Semileptonic $B^+ \to \pi^+ \ell^+ \ell^-$ Decay.

Ahmed Ali, Alexander Parkhomenko & Aleksey Rusov
We present a precise calculation of the dilepton invariant-mass spectrum and branching fraction for $B^+ \to \pi^+ \ell^+ \ell^-$ ($\ell^\pm = e^\pm, \mu^\pm $) in the Standard Model (SM) based on the effective Hamiltonian approach for the $b \to d \ell^+ \ell^-$ transitions. Theoretical estimates strongly depend on the form factors~$f_+ (q^2)$, $f_0 (q^2)$ and~$f_T (q^2)$. Of these, $f_+ (q^2)$ is well measured in the semileptonic decays $B \to \pi \ell \nu_\ell$ and we use...

Prompt photon and associated $b$,$c$-tagged jet production within the $k_T$-factorization approach.

A. V. Lipatov, UnderlineM. A. Malyshev & N. P. Zotov
We present the results of the numerical calculations of prompt photon and associated $b$- or $c$-quark tagged jet production at Tevatron in the framework of the $k_T$-factorization approach. Our predictions are compared with the D$\emptyset$ and CDF experimental data.

Light and Heavy Hadrons in AdS/QCD.

Valery E. Lyubovitskij, Thomas Gutsche, Ivan Schmidt & Alfredo Vega
We discuss light and heavy hadrons in a holographic soft-wall AdS/QCD model. This approach is based on an action which describes hadron structure with broken conformal and chiral invariance and incorporates confinement through the presence of a background dilaton field. According to the gauge/gravity duality the five-dimensional boson and fermion fields propagating in AdS space are dual to four-dimensional fields leaving on the surface of AdS sphere, which correspond to hadrons. In this picture hadronic...

Renormdynamics, Valence Quarks and Multiparticle Production.

Nugzar Makhaldiani
Concise introduction in QCD renormdynamics with prediction of the pion-nucleon and low energy QCD fine structure constants and valence quark mechanism of the multiparticle production given.

XYZ States - Results from Experiments.

Soeren Lange
Contribution to Proceedings

Recent Belle results.

Dmitri Liventsev
We review the recent results from the Belle experiment: search for new physics in $B \to \tau \nu$ and related decays, study of charged bottomonium-like states $Z_b$ and measurement of the parameters of the Cabibbo-Kobayashi-Maskawa matrix in $B^0\to\pi^+\pi^-$ and $B^0\to\rho^0\rho^0$ decays.

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  • 2014
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