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

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.

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THE PROTON FORM FACTOR RATIO AT LOW Q2: NEW RESULTS FROM JEFFERSON LAB

Modern Physics Letters A ◽

10.1142/s0217732311037029 ◽

2011 ◽

Vol 26 (35) ◽

pp. 2605-2614 ◽

Cited By ~ 2

Author(s):

G. RON

Keyword(s):

Form Factor ◽

Form Factors ◽

Muonic Hydrogen ◽

Proton Form Factor ◽

Jefferson Lab ◽

Proton Charge ◽

Proton Charge Radius ◽

Proton Form ◽

Factor Ratio ◽

Proton Form Factors

Recently an experiment at Jefferson Lab has measured the proton form factor ratio, [Formula: see text], down to Q2 ~ 0.3 GeV 2 with unprecedented precision. Based on the results from this experiment, a re-analysis was carried out for the world data on proton form factors, and a new result was extracted for the proton charge radius. The new result is consistent with published CODATA results and is at odds with the new muonic hydrogen measurement at PSI. We present the results of the new measurement, as well as discuss an upcoming experiment to measure the form factor ratio down to even lower Q2.

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THE CHOU-YANG MODEL AND π−p ELASTIC SCATTERING

International Journal of Modern Physics A ◽

10.1142/s0217751x87000193 ◽

1987 ◽

Vol 02 (02) ◽

pp. 485-490

Author(s):

MOHAMMAD SALEEM

Keyword(s):

Experimental Data ◽

Form Factor ◽

Elastic Scattering ◽

Pion Form Factor ◽

Proton Form Factor ◽

Proton Form ◽

200 Gev

The prediction that the use of the Borkowski form factor for proton in the Chou-Yang model for π−p elastic scattering at 200 GeV/c yields multiple dip structure in the region −5 ≲ −t ≲ 8 (GeV/c) 2 is shown to be incorrect. A parameterization of the proton form factor obtained by including the new experimental data for large −t when used in conjunction with pion form factor also does not produce the observed dip near −t = 4 (GeV/c) 2. Three possible approaches for a solution of the problem are briefly discussed.

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THE CHOU-YANG MODEL AND ≡−p → ≡−p AT HIGH ENERGIES

International Journal of Modern Physics A ◽

10.1142/s0217751x87000089 ◽

1987 ◽

Vol 02 (01) ◽

pp. 217-222 ◽

Cited By ~ 1

Author(s):

MUJAHID KAMRAN ◽

I. B. QURESHI

Keyword(s):

Form Factor ◽

Form Factors ◽

Electric Form Factor ◽

High Energies ◽

Elastic Data ◽

Good Agreement

The Chou-Yang model is applied to the ≡−p elastic data from the SPS hyperon beam experiments under the assumption that hyperons have approximately equal form factors. Three different expressions for the proton electric form factor are used. All cases yield similar results in good agreement with experiment. The model predicts a dip in dσ/dt around −t ≃ 1 (GeV/c) 2 at present energies.

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BESIII results on time-like baryon form factors

EPJ Web of Conferences ◽

10.1051/epjconf/201921804002 ◽

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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A Study on the Form Factors of Hadrons

JOURNAL OF ADVANCES IN PHYSICS ◽

10.24297/jap.v11i8.238 ◽

2016 ◽

pp. 3961-3965

Author(s):

A. Bhattacharya ◽

R. Saha ◽

R. Ghosh

Keyword(s):

Form Factor ◽

Statistical Model ◽

Momentum Transfer ◽

Form Factors ◽

Scaling Behavior ◽

Proton Form Factor ◽

Large Contribution ◽

Heavy Mesons ◽

Proton Form ◽

Deuteron Form Factor

The form factors of the heavy mesons like Bc+ , Î·b, B0s, F+, B0 , D, Ïˆ,Â Ï•, proton and also deuteron are investigated in the framework of the statistical model for low momentum transfer Q in the range 0.01 â‰¤ Q2 â‰¤ 0.1 GeV2.It has been observedthat the heavy-light flavour mesonic form factors show a scaling behavior in the aforesaid low Q2 range. The proton form factor also shows almost scaling in the aforesaid range whereas the deuteron form factor shows a clear violation indicating large contribution from sea quarks and gluon sector.

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