217 research outputs found
Thermal Recombination: Beyond the Valence Quark Approximation
Quark counting rules derived from recombination models agree well with data
on hadron production at intermediate transverse momenta in relativistic
heavy-ion collisions. They convey a simple picture of hadrons consisting only
of valence quarks. We discuss the inclusion of higher Fock states that add sea
quarks and gluons to the hadron structure. We show that, when recombination
occurs from a thermal medium, hadron spectra remain unaffected by the inclusion
of higher Fock states. However, the quark number scaling for elliptic flow is
somewhat affected. We discuss the implications for our understanding of data
from the Relativistic Heavy Ion Collider.Comment: 5 pages, 5 figure
Polarized rho mesons and the asymmetry between Delta d^bar(x) and Delta u^bar(x) in the sea of the nucleon
We present a calculation of the polarized rho meson cloud in a nucleon using
time-ordered perturbation theory in two different variants advocated in the
literature. We calculate the induced difference between the distributions Delta
d^bar(x) and Delta u^bar(x). We use a recent lattice calculation to motivate an
ansatz for the polarized valence quark distribution of the rho meson. Our
calculations show that the two theoretical approaches give vastly different
results. We conclude that Delta d^bar(x) - Delta u^bar(x) can be of relevant
size with important consequences for the combined fits of polarized
distribution functions.Comment: 14 pages LaTeX, 8 figures; v3: some minor changes; this preprint
supports the version to appear in Phys. Lett. B with an additional appendi
Correlations in the Parton Recombination Model
We describe how parton recombination can address the recent measurement of
dynamical jet-like two particle correlations. In addition we discuss the
possible effect realistic light-cone wave-functions including higher
Fock-states may have on the well-known elliptic flow valence-quark number
scaling law.Comment: 4 pages, two figures, proceedings of the 18th International
Conference on Ultrarelativistic Nucleus-Nucleus Collisions: Quark Matter 2005
(QM 2005), Budapest, Hungary, 4-9 Aug 200
Resummation of nuclear enhanced higher twist in the Drell Yan process
We investigate higher twist contributions to the transverse momentum
broadening of Drell Yan pairs in proton nucleus collisions. We revisit the
contribution of matrix elements of twist-4 and generalize this to matrix
elements of arbitrary twist. An estimate of the maximal nuclear broadening
effect is derived. A model for nuclear enhanced matrix elements of arbitrary
twist allows us to give the result of a resummation of all twists in closed
form. Subleading corrections to the maximal broadening are discussed
qualitatively.Comment: 10 pages, 5 figures; v2: minor changes in text, acknowledgement
added; v3: mistake in fig. 1 correcte
ENGINEERING CAPABILITIES OF IN-PILE IRRADIATION FACILITIES USED BY GE-ANPD
GE-ANPD had exclusive use of irradiation testing facilities in four reactors: the Materials Test Reactor (MTR), the Engineering Test Reactor (ETR), the Low lntensity Test Reactor (LlTR), and the Oak Ridge Research Reactor (ORR). A compilation of data concerning the GE-ANPD facilities in these reactors is presented. lnstrumentation capabilities, dimensions of the in-pile tubes, flow characteristics, control capabilities, and detailed design data are listed. (auth
Strange prospects for LHC energies
Strange quark and hadron production will be studied at the Large Hadron
Collider (LHC) energies in order to explore the properties of both pp and
heavy-ion collisions. The ALICE experiment will be specifically efficient in
the strange sector with the identification of baryons and mesons over a wide
range of transverse momentum. Dedicated measurements are proposed for
investigating chemical equilibration and bulk properties. Strange particles can
also help to probe kinematical regions where hard processes and pQCD dominate.
We try to anticipate here several ALICE analyses to be performed as the first
Pb--Pb and pp data will be available.Comment: 5 pages, 2 figures. To appear in the proceedings of Hot Quarks 2006,
Villasimius, Italy, 15-20 May 200
Search for the onset of baryon anomaly at RHIC-PHENIX
The baryon production mechanism at the intermediate (2 - 5 GeV/) at
RHIC is still not well understood. The beam energy scan data in Cu+Cu and Au+Au
systems at RHIC may provide us a further insight on the origin of the baryon
anomaly and its evolution as a function of . In 2005 RHIC
physics program, the PHENIX experiment accumulated the first intensive low beam
energy data in Cu+Cu collisions. We present the preliminary results of
identified charged hadron spectra in Cu+Cu at = 22.5 and 62.4
GeV using the PHENIX detector. The centrality and beam energy dependences of
(anti)proton to pion ratios and the nuclear modification factors for charged
pions and (anti)protons are presented.Comment: 5 pages, 9 figures, proceedings for Hot Quarks 2006 workshop,
Villasimius, Sardinia, Italy, May 15 - 20, 2006. Proceedings of the
conference will be published in The European Physical Journal
Universal behavior of baryons and mesons' transverse momentum distributions in the framework of percolation of strings
In the framework of percolation of strings, we present predictions for the
and for mesons and baryons and for ratios
at LHC energies.Comment: Presented at "Heavy Ion Collisions at the LHC: last call for
predictions", Geneva Switzerland, May 14th-June 8t
Bulk matter physics and its future at the Large Hadron Collider
Measurements at low transverse momentum will be performed at the LHC for
studying particle production mechanisms in and heavy-ion collisions. Some
of the experimental capabilities for bulk matter physics are presented,
focusing on tracking elements and particle identification. In order to
anticipate the study of baryon production for both colliding systems at
multi-TeV energies, measurements for identified species and recent model
extrapolations are discussed. Several mechanisms are expected to compete for
hadro-production in the low momentum region. For this reason, experimental
observables that could be used for investigating multi-parton interactions and
help understanding the "underlying event" content in the first collisions
at the LHC are also mentioned.Comment: 6 pages, 7 figures. To appear in the proceedings of Hot Quarks 2008,
Estes Park, Colorado, 18-23 August 200
Jet hadrochemistry as a characteristics of jet quenching
Jets produced in nucleus-nucleus collisions at the LHC are expected to be
strongly modified due to the interaction of the parton shower with the dense
QCD matter. Here, we point out that jet quenching can leave signatures not only
in the longitudinal and transverse jet energy and multiplicity distributions,
but also in the hadrochemical composition of the jet fragments. In particular,
we show that even in the absence of medium effects at or after hadronization,
the medium-modification of the parton shower can result in significant changes
in jet hadrochemistry. We discuss how jet hadrochemistry can be studied within
the high-multiplicity environment of nucleus-nucleus collisions at the LHC.Comment: 15 pages, 7 figures, LaTe
- …