CLAS N* Excitation Results from Pion and Kaon Electroproduction

Carman, Daniel S.

doi:10.1007/s00601-018-1405-8

Title: CLAS N* Excitation Results from Pion and Kaon Electroproduction

Abstract

The study of the structure of excited nucleon $N^*$ states employing the electroproduction of exclusive reactions is an important avenue for exploring the nature of the non-perturbative strong interaction. The electrocouplings of $N^*$ states in the mass range below $W$=1.8~GeV have been determined from analyses of CLAS $$\pi N$$, $$\eta N$$, and $$\pi \pi N$$ data at four-momentum transfers $Q^2$ up to 5~GeV$^2$. The work has made it clear that consistent results from independent analyses of several exclusive channels with different couplings and non-resonant backgrounds but the same $N^*$ electroexcitation amplitudes, is essential to have confidence in the extracted results. In terms of hadronic couplings, many high-lying $N^*$ states preferentially decay through the $$\pi \pi N$$ channel, while couplings to $$\pi N$$ final states become rather small. The resonance parameters determined from $$\pi N$$ and $$\pi \pi N$$ electroproduction can be checked in independent studies of the $KY$ ($$Y = \Lambda, \Sigma^0$$) channels. Therefore, data from the $KY$ channels already measured with CLAS will play an important role in $N^*$ structure studies. These comparisons await the development of suitable reaction models. Starting in 2018, a program to study the structure of $N^*$ states in various exclusive electroproduction channels using the new CLAS12 spectrometer will get underway. These studies will probe the structure of $N^*$ states in the mass range up to $W$=3~GeV and $Q^2$ up to 12~GeV$^2$, thus providing a means to access $N^*$ structure information spanning a broad regime encompassing both low- and high-energy degrees of freedom.

Authors:

^[1]

Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Publication Date:: 2018-05-24

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Org.:: CLAS Collaboration

OSTI Identifier:: 1440325

Report Number(s):: JLAB-PHY-18-2610; DOE/OR/23177-4305
Journal ID: ISSN 0177-7963; PII: 1405; TRN: US1900715

Grant/Contract Number:: AC05-06OR23177

Resource Type:: Accepted Manuscript

Journal Name:: Few-Body Systems

Additional Journal Information:: Journal Volume: 59; Journal Issue: 5; Journal ID: ISSN 0177-7963

Publisher:: Springer

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Electromagnetic interactions; Form factors; Nucleon structure; Excited nucleon states

Citation Formats


                    Carman, Daniel S. CLAS N* Excitation Results from Pion and Kaon Electroproduction.  United States: N. p., 2018. 
Web.  doi:10.1007/s00601-018-1405-8.

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                    Carman, Daniel S. CLAS N* Excitation Results from Pion and Kaon Electroproduction.  United States.  https://doi.org/10.1007/s00601-018-1405-8

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                    Carman, Daniel S. Thu .  
"CLAS N* Excitation Results from Pion and Kaon Electroproduction".  United States.  https://doi.org/10.1007/s00601-018-1405-8.  https://www.osti.gov/servlets/purl/1440325.

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@article{osti_1440325,

  title        = {CLAS N* Excitation Results from Pion and Kaon Electroproduction},

  author       = {Carman, Daniel S.},

  abstractNote = {The study of the structure of excited nucleon $N^*$ states employing the electroproduction of exclusive reactions is an important avenue for exploring the nature of the non-perturbative strong interaction. The electrocouplings of $N^*$ states in the mass range below $W$=1.8~GeV have been determined from analyses of CLAS $\pi N$, $\eta N$, and $\pi \pi N$ data at four-momentum transfers $Q^2$ up to 5~GeV$^2$. The work has made it clear that consistent results from independent analyses of several exclusive channels with different couplings and non-resonant backgrounds but the same $N^*$ electroexcitation amplitudes, is essential to have confidence in the extracted results. In terms of hadronic couplings, many high-lying $N^*$ states preferentially decay through the $\pi \pi N$ channel, while couplings to $\pi N$ final states become rather small. The resonance parameters determined from $\pi N$ and $\pi \pi N$ electroproduction can be checked in independent studies of the $KY$ ($Y = \Lambda, \Sigma^0$) channels. Therefore, data from the $KY$ channels already measured with CLAS will play an important role in $N^*$ structure studies. These comparisons await the development of suitable reaction models. Starting in 2018, a program to study the structure of $N^*$ states in various exclusive electroproduction channels using the new CLAS12 spectrometer will get underway. These studies will probe the structure of $N^*$ states in the mass range up to $W$=3~GeV and $Q^2$ up to 12~GeV$^2$, thus providing a means to access $N^*$ structure information spanning a broad regime encompassing both low- and high-energy degrees of freedom.},

  doi          = {10.1007/s00601-018-1405-8},

  journal      = {Few-Body Systems},

  number       = 5,

  volume       = 59,

  place        = {United States},

  year         = {2018},

  month        = {5}

}

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Fig. 1: Schematic representation of the $γ$^∗N → N^∗ electroproduction process. (a) The fully dressed $γ$_$v$$NN$^∗ electrocoupling that determines the $N$^∗ contribution to the resonant part of the meson electroproduction amplitude. (b) The contribution of the three-quark core. (c) The contribution from the meson-baryon cloud, where the sum is overmore »

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Works referenced in this record:

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Yin, Pei-Lin; Chen, Chen; Krein, Gastão
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Title: CLAS N* Excitation Results from Pion and Kaon Electroproduction

Abstract

Citation Formats

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Electroproduction of $p π^{+} π^{-}$ off protons at $0.2 < Q^{2} < 0.6$ ${GeV}^{2}$ and $1.3 < W < 1.57$ GeV with the CLAS detector
journal, January 2009

Systematic study of longitudinal and transverse helicity amplitudes in the hypercentral constituent quark model
journal, December 2012

Polarized structure function $σ_{{LT}^{'}}$ for ${}^{1}H$ $(\vec{e}, e^{'} K^{+}) Λ$ in the nucleon resonance region
journal, June 2008

Beam-recoil polarization transfer in the nucleon resonance region in the exclusive $\vec{e} p \to e^{'} K^{+} \vec{Λ}$ and $\vec{e} p \to e^{'} K^{+} {\vec{Σ}}^{0}$ reactions at the CLAS spectrometer
journal, June 2009

The CEBAF large acceptance spectrometer (CLAS)
journal, May 2003

Properties of baryon resonances from a multichannel partial wave analysis
journal, February 2012

Completing the Picture of the Roper Resonance
journal, October 2015

Review of Particle Physics
journal, July 2012

Studies of n* Structure from the clas Meson Electroproduction data
journal, January 2014

Electroexcitation of nucleon resonances
journal, January 2012

Baryon spectroscopy in lattice QCD with spin identification
conference, January 2012

Neutral pion electroproduction in the resonance region at high $Q^{2}$
journal, September 2009

Ratio of $σ_{L} / σ_{T}$ for $p (e, e^{'} K^{+}) Λ$ extracted from polarization transfer
journal, June 2005

Recoil polarization measurements for neutral pion electroproduction at $Q^{2} = 1 (GeV / c)^{2}$ near the Δ resonance
journal, February 2007

Measurements of $e p \to e^{'} π^{+} π^{-} p^{'}$ cross sections with CLAS at $1.40 GeV < W < 2.0$ GeV and $2.0 {GeV}^{2} < Q^{2} < 5.0 {GeV}^{2}$
journal, August 2017

Hard exclusive reactions and the structure of hadrons
journal, January 2001

Studies of Nucleon Resonance Structure in Exclusive Meson Electroproduction
journal, June 2013

Differential cross section and recoil polarization measurements for the $γ p \to K^{+} Λ$ reaction using CLAS at Jefferson Lab
journal, February 2010

New results from the studies of the $N (1440) 1 / 2^{+}, N (1520) 3 / 2^{-}$ , and $Δ (1620) 1 / 2^{-}$ resonances in exclusive $e p \to e^{'} p^{'} π^{+} π^{-}$ electroproduction with the CLAS detector
journal, February 2016

Coupled-channel analysis of $K Λ$ production in the nucleon resonance region
journal, July 2005

Differential cross sections and recoil polarizations for the reaction $γ p \to K^{+} Σ^{0}$
journal, August 2010

Separated structure functions for exclusive $K^{+} Λ$ and $K^{+} Σ^{0}$ electroproduction at 5.5 GeV measured with CLAS
journal, February 2013

Electroproduction of the $N^{*} (1535)$ nucleon resonance in QCD
journal, July 2015

Baryons in a relativized quark model with chromodynamics
journal, November 1986

Separated structure functions for the exclusive electroproduction of $K^{+} Λ$ and $K^{+} Σ^{0}$ final states
journal, April 2007

Dynamical coupled-channels effects on pion photoproduction
journal, April 2008

Hybrid baryons in QCD
journal, March 2012

Measurement of $e p \to e^{'} p π^{+} π^{-}$ and Baryon Resonance Analysis
journal, July 2003

Electroproduction of kaons from the proton in a Regge-plus-resonance approach
journal, November 2007

Electromagnetic production of kaons from protons, and baryon electromagnetic form factors
journal, March 2012

Bayesian analysis of kaon photoproduction with the Regge-plus-resonance model
journal, July 2012

Investigation of the Conjectured Nucleon Deformation at Low Momentum Transfer
journal, January 2005

Nucleon Resonance Structure Studies via Exclusive KY Electroproduction
journal, June 2016

Induced polarization of $Λ (1116)$ in kaon electroproduction
journal, September 2014

Decays of baryon resonances into ΛK+, ΣK+ and Σ+K0
journal, September 2005

Nucleon and $${\Delta}$$ Δ Elastic and Transition Form Factors
journal, October 2014

Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction
journal, November 2009

First Measurement of Transferred Polarization in the Exclusive $\vec{e} p \to e^{'} K^{+} \vec{Λ}$ Reaction
journal, April 2003

Revealing Dressed Quarks via the Proton’s Charge Distribution
journal, September 2013

Nucleon electromagnetic form factors and electroexcitation of low-lying nucleon resonances in a light-front relativistic quark model
journal, May 2012

Hadron Physics and QCD: Just the Basic Facts.
journal, July 2015

Electroproduction of the $Δ (1232)$ Resonance at High Momentum Transfer
journal, January 1999

The light-baryon spectrum in a relativistic quark model with instanton-induced quark forces: The non-strange-baryon spectrum and ground states
journal, June 2001

Measurements of $e p \to e^{'} π^{+} n$ at $1.6 < W < 2.0$ GeV and extraction of nucleon resonance electrocouplings at CLAS
journal, April 2015

Masses of ground-state mesons and baryons, including those with heavy quarks
journal, August 2019

Spectrum and structure of octet and decuplet baryons and their positive-parity excitations
journal, September 2019

Nucleon-to-Roper electromagnetic transition form factors at large $Q^{2}$
journal, February 2019