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Title: Electroproduction of phi(1020) Mesons

Abstract

Electroproduction of exclusive $$\phi$$ vector mesons has been studied with the CLAS detector at an average $Q^2$ of $2.21$$\,GeV$$^2$. The scaling exponent for the total cross section as $$1/(Q^2+M_{\phi}^2)^n$$ was determined to be $$n=1.97 \pm 0.84$$, consistent with the Vector Dominance Model prediction of n=2. The data are consistent with the assumption of s-channel helicity conservation (SCHC). Under this assumption we determine the ratio of longitudinal to transverse cross sections to be $$R=0.86 \pm 0.24$$.

Authors:
;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
914648
Report Number(s):
JLAB-PHY-07-708; DOE/ER/40150-4326
TRN: US0803357
DOE Contract Number:
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Conference: Exclusive Reactions at High Momentum Transfer, May 21-24, 2007, Newport News, VA
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CROSS SECTIONS; ELECTROPRODUCTION; FORECASTING; HELICITY; MESONS; MOMENTUM TRANSFER; S CHANNEL; TOTAL CROSS SECTIONS; VECTOR DOMINANCE MODEL; VECTOR MESONS

Citation Formats

Elton Smith, and Joseph Santoro. Electroproduction of phi(1020) Mesons. United States: N. p., 2007. Web.
Elton Smith, & Joseph Santoro. Electroproduction of phi(1020) Mesons. United States.
Elton Smith, and Joseph Santoro. Mon . "Electroproduction of phi(1020) Mesons". United States. doi:. https://www.osti.gov/servlets/purl/914648.
@article{osti_914648,
title = {Electroproduction of phi(1020) Mesons},
author = {Elton Smith and Joseph Santoro},
abstractNote = {Electroproduction of exclusive $\phi$ vector mesons has been studied with the CLAS detector at an average $Q^2$ of $2.21$\,GeV$^2$. The scaling exponent for the total cross section as $1/(Q^2+M_{\phi}^2)^n$ was determined to be $n=1.97 \pm 0.84$, consistent with the Vector Dominance Model prediction of n=2. The data are consistent with the assumption of s-channel helicity conservation (SCHC). Under this assumption we determine the ratio of longitudinal to transverse cross sections to be $R=0.86 \pm 0.24$.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 21 00:00:00 EDT 2007},
month = {Mon May 21 00:00:00 EDT 2007}
}

Conference:
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  • http://dx.doi.org/10.1103/PhysRevC.78.025210 Electroproduction of exclusivemore » $$\phi$$ vector mesons has been studied with the CLAS detector in the kinematical range $$1.6\leq Q^2\leq 3.8$$ GeV$$^{2}$$, $$0.0\leq t^{\prime}\leq 3.6$$ GeV$$^{2}$$, and $$2.0\leq W\leq 3.0$$ GeV. The scaling exponent for the total cross section as $$1/(Q^2+M_{\phi}^2)^n$$ was determined to be $$n=2.49\pm 0.33$$. The slope of the four-momentum transfer $t'$ distribution is $$b_{\phi}=0.98 \pm 0.17$$ GeV$$^{-2}$$. The data are consistent with the assumption of s-channel helicity conservation (SCHC). Under this assumption, we determine the ratio of longitudinal to transverse cross sections to be $$R=0.86 \pm 0.24$$. A 2-gluon exchange model is able to reproduce the main features of the data.« less
  • Electroproduction of exclusive {phi} vector mesons has been studied with the CLAS detector in the kinematic range 1.4{<=}Q{sup 2}{<=}3.8 GeV{sup 2},0.0{<=}t{sup '}{<=}3.6 GeV{sup 2}, and 2.0{<=}W{<=}3.0 GeV. The scaling exponent for the total cross section as 1/(Q{sup 2}+M{sub {phi}}{sup 2}){sup n} was determined to be n=2.49{+-}0.33. The slope of the four-momentum transfer t{sup '} distribution is b{sub {phi}}=0.98{+-}0.17 GeV{sup -2}. Under the assumption of s-channel helicity conservation, we determine the ratio of longitudinal to transverse cross sections to be R=0.86{+-}0.24. A two-gluon exchange model is able to reproduce the main features of the data.
  • This analysis studies the reaction ep → e'p'φ in the kinematical range 1.6 ≤ Q 2 ≤ 3.8 GeV 2 and 2.0 ≤ W ≤ 3.0 GeV at CLAS. After successful signal identification, total and differential cross sections are measured and compared to the world data set. Comparisons are made to the predictions of the Jean-Mart Laget (JML) model based on Pomeron plus 2-gluon exchange. The overall scaling of the total cross section was determined to be 1/Q 4.6+/-1.7 which is compatible within errors to the Vector Meson Dominance prediction of 1/ Q 4 as well as to the expectedmore » behavior of a quark and gluon exchange-dominated model described by Generalized Parton Distributions of 1/Q 6. The differential cross section dσ/dΦ was used to determine that the s-channel helicity conservation (SCHC) assumption is valid within the precision of the current data. SCHC leads to a simple expression for the decay angular distribution from which R, the ratio of the longitudinal to the transverse cross section, can be extracted. Under the assumption of SCHC, we determine R = 1.33 ± 0.18 at an average Q 2 of 2.21 GeV 2 which leads to a determination of the longitudinal cross section s L = 5.3 ± 1.3 nb for exclusive φ production.« less
  • The cross-section for phi meson photoproduction on the proton has been measured for the first time up to a four-momentum transfer t=-4 GeV{sup 2}, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. At low four-momentum transfer, the differential cross section is well-described by Pomeron exchange. At large four-momentum transfer, above -t=1.8 GeV{sup 2}, the data support a model where the Pomeron is resolved into its simplest component, two gluons, which may couple to any quark in the proton and in the phi.