scholarly journals Baryon Form Factors at BESIII

2019 ◽  
Vol 212 ◽  
pp. 07001 ◽  
Author(s):  
Kai Zhu
Keyword(s):  
Form Factor ◽  
Electromagnetic Form Factor ◽  
Energy Region ◽  
Recent Progress ◽  
Form Factors ◽  
Electromagnetic Form Factors ◽  
Short Discussion ◽  
Mass System ◽  
System Energy

In this talk I present recent progress on the studies of baryon form factors at BESIII, including the measurements of the time-like proton electromagnetic form factor via e+e−→ pp̅ in the center-mass-system energy region 2.0 −3.08 GeV, as well as the electromagnetic form factors of Λ and Λc, respectively. These results are followed by a short discussion about the prospects of the BESIII program in this area.

scholarly journals Electromagnetic Form Factor of Doubly-Strange Hyperon

Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 65
Author(s):  
Xiongfei Wang ◽  
Guangshun Huang
Keyword(s):  
Form Factor ◽  
Standard Model ◽  
Pair Production ◽  
Theoretical Investigation ◽  
Electromagnetic Form Factor ◽  
Particle Physics ◽  
Form Factors ◽  
Electromagnetic Form Factors ◽  
The Standard Model ◽  
Quark Models

The standard model of particle physics is a well-tested theoretical framework, but there are still some issues that deserve experimental and theoretical investigation. The Ξ resonances with strangeness S=−2, the so-called doubly-strange hyperon, can provide important information to further test the standard model by studying their electromagnetic form factors, such as probing the limitation of the quark models and spotting unrevealed aspects of the QCD description of the structure of hadron resonances. In this work, we review some recent studies of the electromagnetic form factors on doubly-strange hyperons in pair production from positron–electron annihilation experiment.

Electromagnetic form factor of Ds∗ meson from Nf = 2 twisted mass lattice QCD

2019 ◽  
Vol 34 (30) ◽  
pp. 1950194 ◽  
Author(s):  
Ning Li ◽  
Ya-Jie Wu
Keyword(s):  
Form Factor ◽  
Quantum Chromodynamics ◽  
Electromagnetic Form Factor ◽  
Form Factors ◽  
Electromagnetic Form Factors ◽  
Lattice Quantum Chromodynamics ◽  
Twisted Mass ◽  
Lattice Quantum ◽  
Ds Meson ◽  
Twisted Boundary Conditions

We investigate the electromagnetic form factor of [Formula: see text] meson using [Formula: see text] twisted mass lattice quantum chromodynamics gauge configurations. The numerical simulations are carried out under twisted boundary conditions which are helpful to increase the resolution in momentum space. We determine electromagnetic form factors with more small four-momentum transfer, and further fit the charge radius for [Formula: see text] meson.

scholarly journals Nucleon and Δ electromagnetic form factors

2015 ◽  
Vol 39 ◽  
pp. 1560089
Author(s):  
Erik Bartoš ◽  
Stanislav Dubnička ◽  
Anna-Zuzana Dubničková
Keyword(s):  
Form Factor ◽  
Magnetic Dipole ◽  
Transition Form Factor ◽  
Form Factors ◽  
Dipole Transition ◽  
Nucleon Resonance ◽  
Electromagnetic Form Factors ◽  
Analytic Model ◽  
Transition Form ◽  
Measured Ratio

The unitary and analytic model for nucleons works very well. The model for spin [Formula: see text] baryons can predict static parameters for [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text]. We prepared the scheme how to construct the model also for [Formula: see text] nucleon resonance. It was used to describe transition form factor [Formula: see text] and the experimentally measured ratio [Formula: see text] with the help of relations for magnetic dipole transition and charge quadrupole form factors.

scholarly journals Recent progress on the study of nucleon structure from lattice QCD and future perspectives

2020 ◽  
Author(s):  
Constantia Alexandrou
Keyword(s):  
Lattice Qcd ◽  
Recent Progress ◽  
Form Factors ◽  
Distribution Functions ◽  
Nucleon Structure ◽  
Electromagnetic Form Factors ◽  
Momentum Fraction ◽  
Future Perspectives ◽  
Parton Distribution Functions ◽  
Quark Masses

We review the progress achieved within the last five years in the simulations of lattice QCD, as well as in the analysis for selected quantities probing nucleon structure. In particular, we discuss results on the nucleon electromagnetic form factors, \sigmaσ-terms, the momentum fraction carried by quark in the nucleon and the helicity and transversity moments. All quantities are obtained using simulations generated with quark masses fixed to their physical values. In addition, we review the on-going effort to extract parton distribution functions (PDFs) directly from lattice QCD using the quasi-PDF approach.

scholarly journals The electromagnetic form factors of Λ hyperon in e+e−→Λ̄Λ

2018 ◽  
Vol 33 (22) ◽  
pp. 1850133 ◽  
Author(s):  
Yongliang Yang ◽  
Zhun Lu
Keyword(s):  
Form Factor ◽  
Cross Sections ◽  
Form Factors ◽  
Magnetic Form Factor ◽  
Electromagnetic Form Factors ◽  
Threshold Region ◽  
Double Spin ◽  
Electron Positron Annihilation ◽  
Effective Form ◽  
Two Parameters

We study the electromagnetic form factors of [Formula: see text] hyperon in the time-like region using the experimental data in the exclusive production of [Formula: see text] pair in electron–positron annihilation. We present a pQCD inspired parametrization of [Formula: see text] and [Formula: see text] with only two parameters, and we consider a suppression mechanism of the electric form factor [Formula: see text] compared to the magnetic form factor [Formula: see text]. The parameters are determined through fitting our parametrization to the data of the effective form factor [Formula: see text] from the DM2, BaBar and BESIII Collaborations in the reaction [Formula: see text]. We use the parametrizations for [Formula: see text] and [Formula: see text] to calculate the Born cross-sections as well as the ratio [Formula: see text]. Except the threshold region, our parametrization can describe the known behavior of the existing data of effective form factor, Born cross-section and the ratio [Formula: see text] from the BaBar, DM2 and BESIII Collaborations. We also predict the double spin polarization observables [Formula: see text], [Formula: see text] and [Formula: see text] in [Formula: see text] which could provide more information on the size of the lambda EMFFs as well as their phase angles.

scholarly journals Measurement of Proton Electromagnetic Form Factors in e+e−→pp¯ in the Energy Region 2.00–3.08 GeV

2020 ◽  
Vol 124 (4) ◽  
Author(s):  
M. Ablikim ◽  
M. N. Achasov ◽  
P. Adlarson ◽  
S. Ahmed ◽  
M. Albrecht ◽  
...  
Keyword(s):  
Energy Region ◽  
Form Factors ◽  
Electromagnetic Form Factors

THE CHOU-YANG MODEL AND ELASTIC πp SCATTERING AT HIGH ENERGIES

1987 ◽  
Vol 02 (06) ◽  
pp. 1871-1886
Author(s):  
MUJAHID KAMRAN ◽  
I.E. QURESHI
Keyword(s):  
Form Factor ◽  
Form Factors ◽  
Proton Form Factor ◽  
Electromagnetic Form Factors ◽  
Matter Distribution ◽  
High Energies ◽  
Proton Form ◽  
200 Gev ◽  
Elastic Data

By considering 14 different pion and proton form-factor combinations it is shown that the Chou-Yang model is not successful in describing πp elastic data at 200 GeV/c. It is further shown that a modified version in which the proton matter distribution is different from its electromagnetic form factors is able to describe the data well. Aspects of amplitude structure are also discussed.

Kaon Electromagnetic Form Factor in a Veneziano-Type Representation

1972 ◽  
Vol 50 (14) ◽  
pp. 1652-1655 ◽  
Author(s):  
T. C. Chia
Keyword(s):  
Form Factor ◽  
Simple Form ◽  
Electromagnetic Form Factor ◽  
Form Factors ◽  
High Energy ◽  
Scattering Data ◽  
Type Representation ◽  
Scaling Hypothesis

A simple form of kaon electromagnetic form factor in a Veneziano-type representation is investigated. With the conjecture of Yang et al. and Elitzur's scaling hypothesis for hadronic form factors, the kaon form factor is linked to and compared with high energy K + P → K + P and K + P → K*P scattering data. The results are found to be satisfactory.

scholarly journals BESIII results on time-like baryon form factors

2019 ◽  
Vol 218 ◽  
pp. 04002
Author(s):  
Alaa Dbeyssi
Keyword(s):  
Form Factor ◽  
Center Of Mass ◽  
Form Factors ◽  
Initial State Radiation ◽  
Proton Form Factor ◽  
Electromagnetic Form Factors ◽  
Initial State ◽  
Data Set ◽  
Preliminary Results ◽  
State Radiation

This contribution reports on the recent measurements of baryon electromagnetic form factors at the BESIII experiment in Beijing. The Beijing e+e − collider BEPCII is a double-ring symmetric collider running at $ \sqrt s $ between 2.0 and 4.6 GeV. Baryon electromagnetic form factors can be measured at BESIII in direct e+e−-annihilation and in initial state radiation processes. Based on the data collected by the BESIII detector at 12 center of mass energies between 2.23 and 3.67 GeV, the measured $ \mathop e\nolimits^ + \mathop e\nolimits^ - \to \mathop p\limits^ - p $ cross section and the time-like proton form factor are presented. Preliminary results from the analysis of the initial state radiation process $ \mathop e\nolimits^ + \mathop e\nolimits^ - \to \mathop p\limits^ - p\gamma $ using a data set of 7.408 fb−1 collected at center of mass energies between 3.773 and 4.6 GeV, are also shown. The cross sections for $ \mathop e\nolimits^ + \mathop e\nolimits^ - \to \mathop {\mathop \Lambda \nolimits_c^ - }\limits^ - \mathop \Lambda \nolimits_c^ + $ and $ \mathop e\nolimits^ + \mathop e\nolimits^ - \to \mathop \Lambda \limits^ - \Lambda $ are measured near threshold with unprecedented precision. Preliminary results on the first measurement of the ^c form factor ratio |GE|/|GM| are also given. Ongoing analysis based on the high luminosity energy scan from 2015 and from radiative return at different $ \sqrt s $ are also described.

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