scholarly journals PRELIMINARY RESULTS OF T AND F ASYMMETRIES FOR η PHOTOPRODUCTION FROM THE PROTON

2014 ◽  
Vol 26 ◽  
pp. 1460078 ◽  
Author(s):  
◽  
ROSS TUCKER ◽  
B.G. RITCHIE ◽  
M. DUGGER
Keyword(s):  
Preliminary Data ◽  
Cryogenic Target ◽  
Preliminary Results ◽  
Jefferson Lab ◽  
Polarized Protons ◽  
Theoretical Predictions ◽  
Tagged Photons ◽  
Large Acceptance

We present preliminary data for the T and F asymmetries in η photoproduction from the proton, along with comparisons to theoretical predictions. The data used in the present analysis were taken using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab, a cryogenic target which utilized transversely polarized protons in a butanol target, and incident tagged photons with energy between 0.62 and 2.93 GeV.

scholarly journals Studying neutron structure at Jefferson Lab through electron scattering off the deuteron, using CLAS12 and the Central Neutron Detector

2020 ◽  
Vol 1643 (1) ◽  
pp. 012191
Author(s):  
Paul Naidoo ◽  
Daria Sokhan ◽  
Pierre Chatagnon ◽  
Silvia Niccolai ◽  
Katheryne Price
Keyword(s):  
Neutron Detector ◽  
Meson Production ◽  
Deeply Virtual Compton Scattering ◽  
Virtual Compton Scattering ◽  
High Energy ◽  
Neutral Meson ◽  
Deuteron Target ◽  
Jefferson Lab ◽  
3D Tomography ◽  
Large Acceptance

Abstract Generalised Parton Distributions (GPDs) offer a way of imaging nucleons through 3D tomography. They can be accessed experimentally in processes such as Deeply Virtual Compton Scattering (DVCS) and Deeply Virtual Meson Production (DVMP), where a high energy electron scatters from a quark inside a nucleon and a high energy photon or meson is produced as a result. Jefferson Lab has recently completed its energy upgrade and Hall B houses the new, large-acceptance CLAS12 detector array optimised for measurements of DVCS and DVMP in the newly accessible kinematic regime. Measurements on the proton and neutron are complementary and both are necessary to facilitate access to the full set of GPDs and enable their flavour separation. Neutron DVCS and DVMP are possible with the use of a deuteron target – the first CLAS12 experiment with which has started taking data this year. To enable exclusive reconstruction of DVCS and neutral-meson DVMP, a dedicated detector for recoiling neutrons – the Central Neutron Detector (CND) – was integrated into CLAS12. We present the first CLAS12 deuteron-target experiment, with a focus on the performance of the CND.

Preliminary data of hereditary constitutional studies in endemic goiter in the Mariob region

1930 ◽  
Vol 26 (3) ◽  
pp. 290-299
Author(s):  
M. P. Andreev ◽  
M. G. Ul'yanova
Keyword(s):  
Preliminary Data ◽  
Endemic Goiter ◽  
Journal Article ◽  
Medical Community ◽  
Preliminary Results ◽  
Enormous Amount ◽  
The Future

In the summer of 1928 and 1929, we had to work on an expedition to study the endemic goiter in the Mariob region. It is impossible to cover in a journal article the enormous amount of material that these expeditions brought (mainly in 1929), its processing is still ongoing and the publication of data in special works of the expedition is a matter of the future; but already at the present time it is possible to share some preliminary results that are of interest to a wide medical community.

scholarly journals Is There Observational Evidence for the Evaporation of the Inner Accretion Disk in Dwarf Novae at Quiescence?

1996 ◽  
Vol 158 ◽  
pp. 81-84
Author(s):  
C. La Dous ◽  
E. Meyer-Hofmeister ◽  
F. Meyer
Keyword(s):  
Accretion Disk ◽  
Strong Evidence ◽  
Observational Evidence ◽  
Dwarf Novae ◽  
Evaporation Model ◽  
Preliminary Results ◽  
Theoretical Predictions

AbstractWe present the preliminary results of a comparison of observed general patterns of quiescent dwarf novae and theoretical predictions of the disk evaporation model. We demonstrate that, even though details still have to be clarified, on the whole there is strong evidence that observations and theory are in agreement.

scholarly journals DETERMINATION OF E AND G OBSERVABLES IN η PHOTOPRODUCTION ON THE CLAS FROZEN SPIN TARGET (FROST)

2014 ◽  
Vol 26 ◽  
pp. 1460115
Author(s):  
◽  
IGOR SENDEROVICH ◽  
B. T. MORRISON ◽  
M. DUGGER ◽  
B. RITCHIE ◽  
...  
Keyword(s):  
Baryon Spectrum ◽  
Preliminary Results ◽  
Extensive Data ◽  
Polarized Protons ◽  
The World ◽  
Double Polarization ◽  
Linearly Polarized ◽  
Beam Incident ◽  
Polarization Observables

Polarization observables are vital for disentangling overlapping resonances in the baryon spectrum. Extensive data have been collected at Jefferson Lab in Hall B with circularly and linearly polarized tagged photon beam incident on longitudinally polarized protons provided by the Frozen Spin Target (FROST). The focus of the described work is on η photoproduction, which acts as an "isospin filter", isolating the N*(I = 1/2) resonances. Preliminary results for the double-polarization observables E and G are presented. There are currently no data on these in the world database for η photoproduction.

VECTOR MESON MODIFICATION IN NUCLEAR MATTER AT CLAS

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2417-2420 ◽  
Author(s):  
CHADEN DJALALI ◽  
MIKE WOOD ◽  
RAKHSHA NASSERIPOUR ◽  
DENNIS WEYGAND ◽  
The CLAS COLLABORATION
Keyword(s):  
Vector Meson ◽  
Nuclear Matter ◽  
Leptonic Decay ◽  
Meson Mass ◽  
Combinatorial Background ◽  
Vector Mesons ◽  
Jefferson Lab ◽  
Mass Distributions ◽  
Collisional Broadening ◽  
Large Acceptance

Photoproduction of vector mesons off nuclei were performed at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). The properties of the ρ vector mesons were investigated via their rare leptonic decay to e+e−. After subtracting the combinatorial background, the ρ meson mass distributions were extracted for each of the targets. We observe no effects on the mass of the ρ meson, some widening in titanium and iron is observed consistent with the collisional broadening.

scholarly journals Mini Review Immunological Consequences of Immunization With COVID-19 mRNA Vaccines: Preliminary Results

2021 ◽  
Vol 12 ◽  
Author(s):  
Andrea Lombardi ◽  
Giorgio Bozzi ◽  
Riccardo Ungaro ◽  
Simone Villa ◽  
Valeria Castelli ◽  
...  
Keyword(s):  
Preliminary Data ◽  
Vaccine Efficacy ◽  
Neutralizing Antibodies ◽  
Cellular Response ◽  
Safety And Efficacy ◽  
Specific Antibodies ◽  
Preliminary Results ◽  
Efficacy Profile

Background: BNT162b2 and mRNA-1273 are the two recently approved mRNA-based vaccines against COVID-19 which has shown excellent safety and efficacy. Preliminary data about specific and neutralizing antibodies is available covering the first 100 days after vaccination.Methods: We reviewed all the publications regarding the immunologic consequences of BNT162b2 and mRNA-1273 vaccination. A summary of specific antibodies concentration and neutralizing antibodies titers elicited by each vaccine is provided.Results: BNT162b2 and mRNA-1273 displayed a reassuring safety and efficacy profile, with the latter above 94%. They can elicit specific antibodies titers and neutralizing antibodies concentrations that are far superior from those observed among COVID-19 human convalescent serum, across a wide span of age, for at least 100 days after vaccination. Moreover, the vaccine-induced T cellular response is oriented toward a TH1 response and no evidence of vaccine-enhanced disease have been reported.Discussion: BNT162b2 and mRNA-1273 can elicit specific antibodies titers and neutralizing antibodies concentrations above those observed among COVID-19 human convalescent serum in the first 100 days after vaccination. Data about vaccine efficacy in those with previous COVID-19 or immunocompromised is still limited.

Preliminary results on the cryogenic target for FIREX project

2006 ◽  
Vol 133 ◽  
pp. 899-901
Author(s):  
A. Iwamoto ◽  
R. Maekawa ◽  
T. Mito ◽  
M. Okamoto ◽  
O. Motojima ◽  
...  
Keyword(s):  
Cryogenic Target ◽  
Preliminary Results

scholarly journals The effect of metallicity on the Cepheid period-luminosity relation

2004 ◽  
Vol 193 ◽  
pp. 426-429
Author(s):  
Martino Romaniello ◽  
Francesca Primas ◽  
Marta Mottini ◽  
Martin Groenewegen
Keyword(s):  
Chemical Composition ◽  
Strong Dependence ◽  
Preliminary Results ◽  
Non Linear ◽  
Theoretical Predictions ◽  
Good Agreement

AbstractWe present preliminary results of an observational campaign devoted to establishing the influence of chemical composition on the Cepheid Period-Luminosity relation. The data are in good agreement with theoretical predictions based on non-linear convective models, suggesting a fairly strong dependence of the Period-Luminosity relation on metallicity in the sense of more metal rich stars being intrinsically fainter than otherwise expected. Our data indicate that the error on the inferred distance can be as large as 10% if the role of metallicity is neglected.

scholarly journals The cryogenic target for the experiment at Jefferson lab

2005 ◽  
Vol 551 (2-3) ◽  
pp. 218-235 ◽  
Author(s):  
S.D. Covrig ◽  
E.J. Beise ◽  
R. Carr ◽  
K.K. Gustafsson ◽  
L. Hannelius ◽  
...  
Keyword(s):  
Cryogenic Target ◽  
Jefferson Lab
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