scholarly journals Study of the hyperon-nucleon interaction via final-state interactions in exclusive reactions

2020 ◽  
Author(s):  
Nicholas Zachariou ◽  
Daniel Watts ◽  
Yordanka Ilieva
Keyword(s):  
Spin Asymmetry ◽  
Thomas Jefferson ◽  
Large Set ◽  
Nuclear System ◽  
Nucleon Interaction ◽  
Final State ◽  
Novel Approach ◽  
Final State Interactions ◽  
Beam Spin Asymmetry

A novel approach that allows access to long-sought information on the Hyperon-Nucleon (YN) interaction was developed by producing a hyperon beam within a few-body nuclear system, and studying final-state interactions. The determination of polarisation observables, and specifically the beam spin asymmetry, in exclusive reactions allows a detailed study of the various final-state interactions and provides us with the tools needed to isolate kinematic regimes where the YN interaction dominates. High-statistics data collected using the CLAS detector housed in Hall-B of the Thomas Jefferson laboratory allows us to obtain a large set of polarisation observables and place stringent constraints on the underlying dynamics of the YN interaction.

scholarly journals Determination of the beam-spin asymmetry of deuteron photodisintegration in the energy regionEγ=1.1–2.3 GeV

2015 ◽  
Vol 91 (5) ◽  
Author(s):  
N. Zachariou ◽  
Y. Ilieva ◽  
B. L. Berman ◽  
N. Ya. Ivanov ◽  
M. M. Sargsian ◽  
...  
Keyword(s):  
Spin Asymmetry ◽  
Deuteron Photodisintegration ◽  
Beam Spin Asymmetry

scholarly journals The Tensor and the Scalar Charges of the Nucleon from Hadron Phenomenology

2018 ◽  
Vol 172 ◽  
pp. 03007
Author(s):  
A. Courtoy
Keyword(s):  
Standard Model ◽  
Spin Asymmetry ◽  
Beyond The Standard Model ◽  
Scalar Charge ◽  
The Standard Model ◽  
Asymmetry Data ◽  
Fragmentation Functions ◽  
The Impact ◽  
Beam Spin Asymmetry

We discuss the impact of the determination of the nucleon tensor charge on searches for physics Beyond the Standard Model. We also comment on the future extraction of the subleading-twist PDF e(x) from Jefferson Lab soon-to-be-released Beam Spin Asymmetry data as well as from the expected data of CLAS12 and SoLID, as the latter is related to the scalar charge. These analyses are possible through the phenomenology of Dihadron Fragmentation Functions related processes, which we report on here as well.

ELEMENTS OF RELATIVISTIC QUANTUM MECHANICS FOR FINAL STATE INTERACTIONS

2003 ◽  
Vol 18 (03) ◽  
pp. 411-420
Author(s):  
M. A. Pichowsky
Keyword(s):  
Quantum Mechanics ◽  
Relativistic Quantum ◽  
Baryon Resonance ◽  
Resonance Region ◽  
Thomas Jefferson ◽  
Relativistic Quantum Mechanics ◽  
Final State ◽  
Accelerator Facility ◽  
Coupled Channels ◽  
Final State Interactions

In the baryon resonance region the likelihood that electroproduction reactions will lead to multiple hadron production either in the final-state or in intermediate states requires a framework capable of describing the non-perturbative, coupled-channels nature of hadron scattering. For applications in the energy region accessible to the Thomas Jefferson National Accelerator Facility, such a framework must be Poincaré covariant, electromagnetic gauge invariant and unitary. These aspects of final-state interactions and how they have been implemented into frameworks based on the instant-form of relativistic quantum mechanics are briefly outlined.

PROCESS DEPENDENCE AND THE SIVERS EFFECT IN INCLUSIVE AND SEMI-INCLUSIVE REACTIONS

2014 ◽  
Vol 25 ◽  
pp. 1460018
Author(s):  
LEONARD GAMBERG ◽  
ZHONG-BO KANG ◽  
ALEXEI PROKUDIN
Keyword(s):  
Experimental Data ◽  
Spin Asymmetry ◽  
Initial State ◽  
Final State ◽  
Proton Proton ◽  
Proton Collisions ◽  
Asymmetry Data ◽  
Final State Interactions ◽  
Inclusive Jet Production ◽  
Proton Proton Collisions

We perform an analysis of the the spin asymmetry for single inclusive jet production in proton-proton collisions collected by AnDY experiment and the Sivers asymmetry data from semi-inclusive deep inelastic scattering experiments. In particular, we consider the role color gauge invariance plays in determining the process-dependence of the Sivers effect. We find that after carefully taking into account the initial-state and final-state interactions between the active parton and the remnant of the polarized hadron, the calculated jet spin asymmetry based on the Sivers functions extracted from HERMES and COMPASS experiments is consistent with the AnDY experimental data. This provides a first indication for the process-dependence of the Sivers effect in different processes. We also make predictions for both direct photon and Drell-Yan spin asymmetry, to further test the process-dependence of the Sivers effect in future experiments.

scholarly journals Nuclear Effects and CP Sensitivity at DUNE

2020 ◽  
Vol 2020 ◽  
pp. 1-6 ◽  
Author(s):  
Srishti Nagu ◽  
Jaydip Singh ◽  
Jyotsna Singh ◽  
R. B. Singh
Keyword(s):  
Neutrino Oscillation ◽  
Precise Measurement ◽  
Neutrino Energy ◽  
Final State ◽  
Energy Reconstruction ◽  
Systematic Uncertainties ◽  
Final State Interactions ◽  
Nuclear Effects ◽  
Nuclear Targets

The precise measurement of neutrino-oscillation parameters is one of the highest priorities in neutrino-oscillation physics. To achieve the desired precision, it is necessary to reduce the systematic uncertainties related to neutrino energy reconstruction. An error in energy reconstruction is propagated to all the oscillation parameters; hence, a careful estimation of the neutrino energy is required. To increase the statistics, neutrino-oscillation experiments use heavy nuclear targets like argon (Z=18). The use of these nuclear targets introduces nuclear effects that severely impact the neutrino energy reconstruction which in turn poses influence in the determination of neutrino-oscillation parameters. In this work, we have tried to quantify the presence of nuclear effects on the bounds of the CP phase by DUNE using final state interactions.

scholarly journals FINAL-STATE INTERACTIONS AND SINGLE-SPIN ASYMMETRIES IN SEMI-INCLUSIVE DEEP INELASTIC SCATTERING

2003 ◽  
Vol 18 (08) ◽  
pp. 1327-1334 ◽  
Author(s):  
STANLEY J. BRODSKY ◽  
DAE SUNG HWANG ◽  
IVAN SCHMIDT
Keyword(s):  
Spin Asymmetry ◽  
Proton Spin ◽  
Final State ◽  
Complex Phase ◽  
Target Nucleon ◽  
Spin Asymmetries ◽  
Single Spin ◽  
Polarized Target ◽  
Single Spin Asymmetries ◽  
Final State Interactions

Recent measurements from the HERMES and SMC collaborations show a remarkably large azimuthal single-spin asymmetries AUL and AUT of the proton in semi-inclusive pion leptoproduction γ*(q) p → π X. We show that final-state interactions from gluon exchange between the outgoing quark and the target spectator system leads to single-spin asymmetries in deep inelastic lepton-proton scattering at leading twist in perturbative QCD; i.e., the rescattering corrections are not power-law suppressed at large photon virtuality q2 at fixed xbj. The existence of such single-spin asymmetries requires a phase difference between two amplitudes coupling the proton target with [Formula: see text] to the same final-state, the same amplitudes which are necessary to produce a nonzero proton anomalous magnetic moment. We show that the exchange of gauge particles between the outgoing quark and the proton spectators produces a Coulomb-like complex phase which depends on the angular momentum Lz of the proton's constituents and thus is distinct for different proton spin amplitudes. The single-spin asymmetry which arises from such final-state interactions does not factorize into a product of structure function and fragmentation function, and it is not related to the transversity distribution δq(x,Q) which correlates transversely polarized quarks with the spin of the transversely polarized target nucleon.

scholarly journals Spin asymmetry in γe ↑→e+2 jets: A laboratory for final state interactions

1984 ◽  
Vol 25 (1) ◽  
pp. 49-54
Author(s):  
Jacques Layssac ◽  
Bernard Pire ◽  
John P. Ralston
Keyword(s):  
Spin Asymmetry ◽  
Final State ◽  
Final State Interactions

The Use of TMAH to Etch Silicon and Expose Metal Bridging Failures

2000 ◽  
Author(s):  
Mark Morris ◽  
James Mohr ◽  
Esteban Ortiz ◽  
Steven Englebretson
Keyword(s):  
Failure Mechanism ◽  
Schottky Diodes ◽  
Tetramethylammonium Hydroxide ◽  
Novel Approach ◽  
Failure Location ◽  
Metal Etching ◽  
Plastic Mold

Abstract Determination of metal bridging failures on plastic encapsulated devices is difficult due to the metal etching effects that occur while removing many of the plastic mold compounds. Typically, the acids used to remove the encapsulation are corrosive to the metals that are found within the device. Thus, decapsulation can result in removal of the failure mechanism. Mechanical techniques are often not successful due to damage that results in destruction of the die and failure mechanism. This paper discusses a novel approach to these types of failures using a silicon etch and a backside evaluation. The desirable characteristics of the technique would be to remove the silicon and leave typical device metals unaffected. It would also be preferable that the device passivation and oxides not be etched so that the failure location is not disturbed. The use of Tetramethylammonium Hydroxide (TMAH), was found to fit these prerequisites. The technique was tested on clip attached Schottky diodes that exhibited resistive shorting. The use of the TMAH technique was successful at exposing thin solder bridges that extruded over the edge of the die resulting in failure.

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