Colloquium: Roper resonance: Toward a solution to the fifty year puzzle

Burkert, Volker D.; Roberts, Craig D.

doi:10.1103/RevModPhys.91.011003

Title: Colloquium: Roper resonance: Toward a solution to the fifty year puzzle

Abstract

Discovered in 1963, the Roper resonance appears to be an exact copy of the proton except that its mass is 50% greater and it is unstable. These features of the Roper have been very difficult to explain so that for half a century this lightest excited state of the proton has defied understanding. The last decade has presented a new challenge, viz. precise information on the proton-to-Roper electroproduction transition form factors. Reaching to momentum transfer Q(2) approximate to 4.5 GeV2, the data probe a domain within which hard valence-quark degrees of freedom could be expected to determine form factor behavior. An explanation of the Roper should combine an understanding of all these things. This is a prodigious task, but a ten-year international collaborative effort, involving experimentalists and theorists, has presented a candidate solution to the puzzle. Namely, the observed Roper is at the heart of the proton's first radial excitation, consisting of a dressed-quark core augmented by a meson cloud that reduces the core mass by approximately 20% and materially alters its electroproduction form factors on Q(2) < 2m(N)(2), where m(N) is the proton's mass. This Colloquium describes the experimental developments which enabled electroproduction data to be procured within amore »« less

Authors:

Burkert, Volker D. ^[1]; Roberts, Craig D. ^[2]

Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division

Publication Date:: Thu Mar 14 00:00:00 EDT 2019

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

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

OSTI Identifier:: 1501553

Alternate Identifier(s):: OSTI ID: 1499832; OSTI ID: 1510476

Report Number(s):: JLAB-PHY-18-2; arXiv:1710.02549; DOE/OR/23177-4244
Journal ID: ISSN 0034-6861

Grant/Contract Number:: AC05-06OR23177; AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Reviews of Modern Physics

Additional Journal Information:: Journal Volume: 91; Journal Issue: 1; Journal ID: ISSN 0034-6861

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; particle interactions; quantum field theory; form factors; lepton-hadron colliders

Citation Formats


                    Burkert, Volker D., and Roberts, Craig D. Colloquium: Roper resonance: Toward a solution to the fifty year puzzle.  United States: N. p., 2019. 
Web.  doi:10.1103/RevModPhys.91.011003.

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                    Burkert, Volker D., & Roberts, Craig D. Colloquium: Roper resonance: Toward a solution to the fifty year puzzle.  United States.  https://doi.org/10.1103/RevModPhys.91.011003

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                    Burkert, Volker D., and Roberts, Craig D. Thu .  
"Colloquium: Roper resonance: Toward a solution to the fifty year puzzle".  United States.  https://doi.org/10.1103/RevModPhys.91.011003.  https://www.osti.gov/servlets/purl/1501553.

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@article{osti_1501553,

  title        = {Colloquium: Roper resonance: Toward a solution to the fifty year puzzle},

  author       = {Burkert, Volker D. and Roberts, Craig D.},

  abstractNote = {Discovered in 1963, the Roper resonance appears to be an exact copy of the proton except that its mass is 50% greater and it is unstable. These features of the Roper have been very difficult to explain so that for half a century this lightest excited state of the proton has defied understanding. The last decade has presented a new challenge, viz. precise information on the proton-to-Roper electroproduction transition form factors. Reaching to momentum transfer Q(2) approximate to 4.5 GeV2, the data probe a domain within which hard valence-quark degrees of freedom could be expected to determine form factor behavior. An explanation of the Roper should combine an understanding of all these things. This is a prodigious task, but a ten-year international collaborative effort, involving experimentalists and theorists, has presented a candidate solution to the puzzle. Namely, the observed Roper is at the heart of the proton's first radial excitation, consisting of a dressed-quark core augmented by a meson cloud that reduces the core mass by approximately 20% and materially alters its electroproduction form factors on Q(2) < 2m(N)(2), where m(N) is the proton's mass. This Colloquium describes the experimental developments which enabled electroproduction data to be procured within a domain that is the purview of strong quantum chromodynamics, thereby providing challenges and opportunities for modern theory, and surveys the developments in reaction models and QCD theory that have enabled this picture of the Roper resonance to be drawn.},

  doi          = {10.1103/RevModPhys.91.011003},

  journal      = {Reviews of Modern Physics},

  number       = 1,

  volume       = 91,

  place        = {United States},

  year         = {Thu Mar 14 00:00:00 EDT 2019},

  month        = {Thu Mar 14 00:00:00 EDT 2019}

}

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Roberts, Craig D.
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Segovia, Jorge; El-Bennich, Bruno; Rojas, Eduardo
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Spectrum of Light- and Heavy-Baryons
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Qin, S. -X.; Roberts, C. D.; Schmidt, S. M.
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Transition form factors and helicity amplitudes for electroexcitation of negative- and positive parity nucleon resonances in a light-front quark model
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Obukhovsky, Igor T.; Faessler, Amand; Fedorov, Dimitry K.
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Energy momentum tensor and the D-term in the bag model
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Neubelt, Matt J.; Sampino, Andrew; Hudson, Jonathan
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journal, August 2013

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journal, January 2016

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journal, January 2016

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journal, May 2010

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journal, September 1976

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journal, March 2003

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journal, August 1947

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

Quantum Electrodynamics - an Individual view
journal, December 1982

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journal, April 1980

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conference, January 2012

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journal, June 1979

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journal, October 1990

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journal, July 1998

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journal, June 2014

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journal, April 1966

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journal, November 2016

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journal, July 1996

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journal, January 2003

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journal, February 2016

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