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 »
- Authors:
-
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
- Publication Date:
- 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.
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
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.
@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}
}
Web of Science
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Works referencing / citing this record:
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