Grazyna Nowak
(IFJ PAN Krakow)
17/07/2009, 09:00
QCD in hadronic physics
Inclusive non-diffractive photoproduction of rho(770)^0, K^*(892)^0 and phi(1020) mesons is investigated with the H1 detector in ep collisions at HERA. The corresponding average \gamma p centre-of-mass energy is 210 GeV. The mesons are measured in the transverse momentum range 0.5<p_T<7 GeV and the rapidity range |y_{lab}|<1. Differential cross sections are presented as a function of...
Daniel Traynor
(Queen Mary, University of London)
17/07/2009, 09:20
QCD in hadronic physics
A first measurement of the charge asymmetry in the scattered hadronic final state in high Q^2 deep-inelastic ep neutral current scattering at HERA has been made. The difference between the normalised distribution of the scaled momentum, xp, for positive and negative particles, measured in the current region of the Breit frame, has been studied together with its evolution as a function of Q^2....
Lydia Shcheglova
(Moscow State University), Dr
Lydia Shcheglova
(Nuclear Physics Institute of Moscow State University)
17/07/2009, 09:40
QCD in hadronic physics
The charged multiplicity distributions and the mean charged
multiplicity have been investigated in inclusive neutral current deep
inelastic ep scattering with the ZEUS detector at HERA using an
integrated luminosity of 38.6 pb-1. The measurements were performed in
the current region of the Breit frame, as well as in the current
fragmentation region of the hadronic centre-of-mass frame....
Vladimir Aushev
(Kiev National University, and Institute for Nuclear Research), Dr
Volodymyr Aushev
(DESY/INR)
17/07/2009, 10:05
QCD in hadronic physics
Inclusive K0sK0s production in ep collisions at HERA was studied with the
ZEUS detector using an integrated luminosity of 0.5 fb-1. Enhancements in
the mass spectrum were observed and are attributed to the production of
f2(1270)/a20(1320), f2'(1525) and f0(1710). Masses and widths were
obtained using a fit which takes into account theoretical predictions
based on SU(3) symmetry arguments,...
Mr
Jan Balewski
(MIT)
17/07/2009, 11:00
QCD in hadronic physics
One of the primary goals of the high-energy spin physics program at RHIC is to determine the polarized gluon contribution, $\Delta G$, to proton spin.
The most recent STAR measurements of the longitudinal double-spin asymmetries, $A_{LL}$,
for the inclusive production of jets, neutral and charged pions at mid-rapidity from
collisions at a center of mass energy of $\sqrt{s} = 200\,$ GeV...
Prof.
Klaus Rith
(University of Erlangen-Nürnberg and DESY)
17/07/2009, 11:25
QCD in hadronic physics
The HERMES experiment at HERA has performed a new determination of the strange quark distribution s(x) from multiplicities of charged kaons in semi-inclusive deep-inelastic scattering (SIDIS) of 27.6 GeV electrons/positrons from deuterium. The extracted distribution function (DF) is much softer than that previously derived from dimuon events in neutrino/antineutrino scattering and those...
Dr
Krzysztof Kurek
(Soltan Institute for Nuclear Studies)
17/07/2009, 11:50
QCD in hadronic physics
The new results on quark helicity distributions and on gluon
polarization Delta_G/G from the COMPASS experiment will be presented.
COMPASS is polarized DIS experiment using polarized muons with an energy
of 160 GeV scattered off a polarised deuteron and proton targets.
Quark helicity distributions are obtained from inclusive and
semi-inclusive reactions from 2002-2004 and 2006...
Dr
Samuel Wallon
(Laboratoire de Physique Théorique)
17/07/2009, 12:10
QCD in hadronic physics
Exclusive processes in hard electroproduction with asymptotic gamma* p center of mass energy is one of the best place for understanding QCD in the perturbative Regge limit.
The HERA experiment recently provided precise data for rho electroproduction, including all
spin density matrix elements. From QCD, it is expected that such a process should factorize between
a hard (calculable)...
Dr
Alexander Borissov
(DESY)
17/07/2009, 14:30
QCD in hadronic physics
Spin Density Matrix Elements (SDMEs) describing the angular distribution of exclusive rho^0 electroproduction and decay are determined in the HERMES experiment with 27.6 GeV beam energy on unpolarized hydrogen and deuterium targets, and on transversely polarized hydrogen target. Those are extracted in the kinematic region 1 < Q^2 < 7 GeV^2, 3 < W < 6.3 GeV,
and -t < 0.4 GeV^2. Within the...
Mr
Wenbin QIAN
(LAL,Orsay and Tsinghua University)
17/07/2009, 14:55
QCD in hadronic physics
The Bc mass and lifetime measurements using the exclusive decay Bc -> Jpsi pi at the LHCb experiment were studied. About 300 signal events are expected for a data set which corresponds to an integrated luminosity of 1 fb-1, with a B/S ratio around 2. Based on these data, the Bc mass and lifetime can be measured with expected statistical errors below 2 MeV/c^2 and 30 fs, respectively
Prof.
Paul Hoyer
(Helsinki University)
17/07/2009, 15:20
QCD in hadronic physics
I discuss the possibility that the quark model emerges as the lowest order of an hbar expansion of QCD bound states. Bound state calculations are generally complicated by backward (in time) motion of their relativistic constituents (Z-graphs, corresponding to pair production in a time-ordered formulation). I show that in the absence of loops (i.e., at lowest order in hbar) bound state dynamics...
Dr
Fulvio piccinini
(INFN Pavia)
17/07/2009, 15:40
QCD in hadronic physics
Assuming that the X(3872) is a D0- \bar D0* molecule, we estimate its prompt production cross section at Tevatron and compare our results with the CDF data. We use different hadronization models, namely
the ones implemented in Pythia and in Herwig, in order to have an estimate of the associated uncertainties.
We give an upper bound for the theoretical cross section
and a lower bound for...
Dr
Marco Bochicchio
(INFN Roma1)
17/07/2009, 16:00
QCD in hadronic physics
In the pure large N Yang-Mills theory there is a quasi BPS sector
that is exactly solvable at large N.
It follows an exact large N beta function and the glueball spectrum
in this sector.
The main technical tool is localization of the loop
equation for quasi BPS Wilson loops by homological deformations
of the loop, somehow in analogy with Witten's cohomological
localization by a...
Riccardo Brugnera
(Padova University and INFN)
17/07/2009, 16:35
QCD in hadronic physics
Inelastic Photo-production of J/Psi mesons is studied in ep-scattering
at HERA. The J/psi decay angular distributions have been measured with
the ZEUS detector, using an integrated luminosity of 468 pb^-1. The
range in photon-proton centre-of-mass energy, W, was 50<W<180 GeV. The
polar and azimuthal angles of the mu+ were measured in the J/psi rest
frame and compared to theoretical...
Prof.
Shan JIN
(Institute of High Energy Physics)
17/07/2009, 17:00
QCD in hadronic physics
We give a status report on the recently operating detector
BESIII at the BEPCII storage ring. We also present results
with the world largest psi(2S) data sample collected with
BESIII, including charmonium spectroscopy and decays,
and light hadron spectroscopy.
Prof.
Claude Amsler
(University of Zurich)
17/07/2009, 17:25
QCD in hadronic physics
We present evidence for the first observation of electromagnetically bound pion-kaon pairs (piK- atoms) with the DIRAC-II experiment at the CERN-PS. The mean life of piK-atoms is related to the s-wave piK-scattering lengths, a measurement of which is relevant to low energy QCD, in particular chiral perturbation theories including the s-quarks. The atoms are produced by a 24 GeV/c proton beam...
Katja Krueger
(Heidelberg University)
17/07/2009, 17:45
QCD in hadronic physics
A possible resonance decaying into the D*-proton final state is investigated in deep inelastic scattering at HERA. The data were taken with the H1 detector in the years 2004 to 2007 and correspond to an integrated luminosity of ~348 pb^-1 thus increasing the available data significantly compared to the analysis of HERAI data.
