Measurements of the γ* → Δ reaction at low Q2

N. Sparveris; S. Stave; P. Achenbach; C. Ayerbe Gayoso; D. Baumann; J. Bernauer; A. M. Bernstein; R. Böhm; D. Bosnar; T. Botto; A. Christopoulou; D. Dale; M. Ding; M. O. Distler; L. Doria; J. Friedrich; A. Karabarbounis; M. Makek; H. Merkel; U. Müller; I. Nakagawa; R. Neuhausen; L. Nungesser; C. N. Papanicolas; A. Piegsa; J. Pochodzalla; M. Potokar; M. Seimetz; S. Širca; S. Stiliaris; Th Walcher; M. Weis

doi:10.1140/epja/i2013-13136-2

Measurements of the γ* → Δ reaction at low Q²

N. Sparveris
, S. Stave
, P. Achenbach
, C. Ayerbe Gayoso
, D. Baumann
, J. Bernauer
, A. M. Bernstein
, R. Böhm
, D. Bosnar
, T. Botto
, A. Christopoulou
, D. Dale
, M. Ding
, M. O. Distler
, L. Doria
, J. Friedrich
, A. Karabarbounis
, M. Makek
, H. Merkel
, U. Müller

I. Nakagawa, R. Neuhausen, L. Nungesser, C. N. Papanicolas, A. Piegsa, J. Pochodzalla, M. Potokar, M. Seimetz, S. Širca, S. Stiliaris, Th Walcher, M. Weis

Physics and Astronomy

Temple University
Massachusetts Institute of Technology
Johannes Gutenberg University Mainz
University of Zagreb
National and Kapodistrian University of Athens
University of Kentucky
RIKEN
University of Ljubljana

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

We report new p(e, e′p)π̊ measurements in the Δ⁺(1232) resonance at the low momentum transfer region utilizing the magnetic spectrometers of the A1 Collaboration at MAMI. The mesonic cloud dynamics are predicted to be dominant and appreciably changing in this region while the momentum transfer is sufficiently low to be able to test chiral effective field theory calculations. The results disagree with predictions of constituent quark models and are in reasonable agreement with dynamical calculations with pion cloud effects, chiral effective field theory and lattice calculations. The reported measurements suggest that improvement is required to the theoretical calculations and provide valuable input that will allow their refinements.

Original language	English
Article number	136
Pages (from-to)	1-7
Number of pages	7
Journal	European Physical Journal A
Volume	49
Issue number	10
DOIs	https://doi.org/10.1140/epja/i2013-13136-2
State	Published - 2013

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Sparveris, N., Stave, S., Achenbach, P., Ayerbe Gayoso, C., Baumann, D., Bernauer, J., Bernstein, A. M., Böhm, R., Bosnar, D., Botto, T., Christopoulou, A., Dale, D., Ding, M., Distler, M. O., Doria, L., Friedrich, J., Karabarbounis, A., Makek, M., Merkel, H., ... Weis, M. (2013). Measurements of the γ* → Δ reaction at low Q². European Physical Journal A, 49(10), 1-7. Article 136. https://doi.org/10.1140/epja/i2013-13136-2

@article{167940683ab24cd4a8487cfbeb94a9d8,

title = "Measurements of the γ* → Δ reaction at low Q2",

abstract = "We report new p(e, e′p)π̊ measurements in the Δ+(1232) resonance at the low momentum transfer region utilizing the magnetic spectrometers of the A1 Collaboration at MAMI. The mesonic cloud dynamics are predicted to be dominant and appreciably changing in this region while the momentum transfer is sufficiently low to be able to test chiral effective field theory calculations. The results disagree with predictions of constituent quark models and are in reasonable agreement with dynamical calculations with pion cloud effects, chiral effective field theory and lattice calculations. The reported measurements suggest that improvement is required to the theoretical calculations and provide valuable input that will allow their refinements.",

author = "N. Sparveris and S. Stave and P. Achenbach and \{Ayerbe Gayoso\}, C. and D. Baumann and J. Bernauer and Bernstein, \{A. M.\} and R. B{\"o}hm and D. Bosnar and T. Botto and A. Christopoulou and D. Dale and M. Ding and Distler, \{M. O.\} and L. Doria and J. Friedrich and A. Karabarbounis and M. Makek and H. Merkel and U. M{\"u}ller and I. Nakagawa and R. Neuhausen and L. Nungesser and Papanicolas, \{C. N.\} and A. Piegsa and J. Pochodzalla and M. Potokar and M. Seimetz and S. {\v S}irca and S. Stiliaris and Th Walcher and M. Weis",

year = "2013",

doi = "10.1140/epja/i2013-13136-2",

language = "English",

volume = "49",

pages = "1--7",

journal = "European Physical Journal A",

issn = "1434-6001",

number = "10",

}

Sparveris, N, Stave, S, Achenbach, P, Ayerbe Gayoso, C, Baumann, D, Bernauer, J, Bernstein, AM, Böhm, R, Bosnar, D, Botto, T, Christopoulou, A, Dale, D, Ding, M, Distler, MO, Doria, L, Friedrich, J, Karabarbounis, A, Makek, M, Merkel, H, Müller, U, Nakagawa, I, Neuhausen, R, Nungesser, L, Papanicolas, CN, Piegsa, A, Pochodzalla, J, Potokar, M, Seimetz, M, Širca, S, Stiliaris, S, Walcher, T & Weis, M 2013, 'Measurements of the γ* → Δ reaction at low Q²', European Physical Journal A, vol. 49, no. 10, 136, pp. 1-7. https://doi.org/10.1140/epja/i2013-13136-2

TY - JOUR

T1 - Measurements of the γ* → Δ reaction at low Q2

AU - Sparveris, N.

AU - Stave, S.

AU - Achenbach, P.

AU - Ayerbe Gayoso, C.

AU - Baumann, D.

AU - Bernauer, J.

AU - Bernstein, A. M.

AU - Böhm, R.

AU - Bosnar, D.

AU - Botto, T.

AU - Christopoulou, A.

AU - Dale, D.

AU - Ding, M.

AU - Distler, M. O.

AU - Doria, L.

AU - Friedrich, J.

AU - Karabarbounis, A.

AU - Makek, M.

AU - Merkel, H.

AU - Müller, U.

AU - Nakagawa, I.

AU - Neuhausen, R.

AU - Nungesser, L.

AU - Papanicolas, C. N.

AU - Piegsa, A.

AU - Pochodzalla, J.

AU - Potokar, M.

AU - Seimetz, M.

AU - Širca, S.

AU - Stiliaris, S.

AU - Walcher, Th

AU - Weis, M.

PY - 2013

Y1 - 2013

N2 - We report new p(e, e′p)π̊ measurements in the Δ+(1232) resonance at the low momentum transfer region utilizing the magnetic spectrometers of the A1 Collaboration at MAMI. The mesonic cloud dynamics are predicted to be dominant and appreciably changing in this region while the momentum transfer is sufficiently low to be able to test chiral effective field theory calculations. The results disagree with predictions of constituent quark models and are in reasonable agreement with dynamical calculations with pion cloud effects, chiral effective field theory and lattice calculations. The reported measurements suggest that improvement is required to the theoretical calculations and provide valuable input that will allow their refinements.

AB - We report new p(e, e′p)π̊ measurements in the Δ+(1232) resonance at the low momentum transfer region utilizing the magnetic spectrometers of the A1 Collaboration at MAMI. The mesonic cloud dynamics are predicted to be dominant and appreciably changing in this region while the momentum transfer is sufficiently low to be able to test chiral effective field theory calculations. The results disagree with predictions of constituent quark models and are in reasonable agreement with dynamical calculations with pion cloud effects, chiral effective field theory and lattice calculations. The reported measurements suggest that improvement is required to the theoretical calculations and provide valuable input that will allow their refinements.

UR - https://www.scopus.com/pages/publications/84891505308

U2 - 10.1140/epja/i2013-13136-2

DO - 10.1140/epja/i2013-13136-2

M3 - Article

AN - SCOPUS:84891505308

SN - 1434-6001

VL - 49

SP - 1

EP - 7

JO - European Physical Journal A

JF - European Physical Journal A

IS - 10

M1 - 136

ER -

Measurements of the γ* → Δ reaction at low Q²

Abstract

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