Self energies of the pion and the Δ isobar from the 3He(e, e′π+)3H reaction

M. Kohl; P. Bartsch; D. Baumann; J. Bermuth; R. Böhm; K. Bohinc; S. Derber; M. Ding; M. O. Distler; I. Ewald; J. Friedrich; J. M. Friedrich; P. Jennewein; M. Kahrau; S. S. Kamalov; A. Kozlov; K. W. Krygier; M. Kuss; A. Liesenfeld; H. Merkel; P. Merle; U. Müller; R. Neuhausen; Th Pospischil; M. Potokar; C. Rangacharyulu; A. Richter; D. Rohe; G. Rosner; H. Schmieden; G. Schrieder; M. Seimetz; S. Širca; T. Suda; L. Tiator; M. Urban; A. Wagner; Th Walcher; J. Wambach; M. Weis; A. Wirzba

doi:10.1016/S0370-2693(02)01345-X

Self energies of the pion and the Δ isobar from the ³He(e, e′π⁺)³H reaction

M. Kohl, P. Bartsch, D. Baumann, J. Bermuth, R. Böhm, K. Bohinc, S. Derber, M. Ding, M. O. Distler, I. Ewald, J. Friedrich, J. M. Friedrich, P. Jennewein, M. Kahrau, S. S. Kamalov, A. Kozlov, K. W. Krygier, M. Kuss, A. Liesenfeld, H. MerkelP. Merle, U. Müller, R. Neuhausen, Th Pospischil, M. Potokar, C. Rangacharyulu, A. Richter, D. Rohe, G. Rosner, H. Schmieden, G. Schrieder, M. Seimetz, S. Širca, T. Suda, L. Tiator, M. Urban, A. Wagner, Th Walcher, J. Wambach, M. Weis, A. Wirzba

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

9 Citations (Scopus)

Abstract

In a kinematically complete experiment at the Mainz microtron MAMI, pion angular distributions of the ³He(e,e′π⁺)³H reaction have been measured in the excitation region of the Δ resonance to determine the longitudinal (L), transverse (T), and the LT interference part of the differential cross section. The data are described only after introducing self-energy modifications of the pion and Δ-isobar propagators. Using Chiral Perturbation Theory (ChPT) to extrapolate the pion self energy as inferred from the measurement on the mass shell, we deduce a reduction of the π⁺ mass of Δm_π+ = (-1.7_-2.1^+1.7) MeV/c² in the neutron-rich nuclear medium at a density of p = (0.057_-0.057^+0.085) fm^-3. Our data are consistent with the Δ self energy determined from measurements of π⁰ photoproduction from ⁴He and heavier nuclei.

Original language	English
Pages (from-to)	67-73
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	530
Issue number	1-4
DOIs	https://doi.org/10.1016/S0370-2693(02)01345-X
Publication status	Published - 2002 Mar 28
Externally published	Yes

Keywords

Delta resonance region
Few-body system
He
Longitudinal-transverse separation
Medium effects
Pion electroproduction
Self energy

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Kohl, M., Bartsch, P., Baumann, D., Bermuth, J., Böhm, R., Bohinc, K., Derber, S., Ding, M., Distler, M. O., Ewald, I., Friedrich, J., Friedrich, J. M., Jennewein, P., Kahrau, M., Kamalov, S. S., Kozlov, A., Krygier, K. W., Kuss, M., Liesenfeld, A., ... Wirzba, A. (2002). Self energies of the pion and the Δ isobar from the ³He(e, e′π⁺)³H reaction. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 530(1-4), 67-73. https://doi.org/10.1016/S0370-2693(02)01345-X

Self energies of the pion and the Δ isobar from the ³He(e, e′π⁺)³H reaction. / Kohl, M.; Bartsch, P.; Baumann, D.; Bermuth, J.; Böhm, R.; Bohinc, K.; Derber, S.; Ding, M.; Distler, M. O.; Ewald, I.; Friedrich, J.; Friedrich, J. M.; Jennewein, P.; Kahrau, M.; Kamalov, S. S.; Kozlov, A.; Krygier, K. W.; Kuss, M.; Liesenfeld, A.; Merkel, H.; Merle, P.; Müller, U.; Neuhausen, R.; Pospischil, Th; Potokar, M.; Rangacharyulu, C.; Richter, A.; Rohe, D.; Rosner, G.; Schmieden, H.; Schrieder, G.; Seimetz, M.; Širca, S.; Suda, T.; Tiator, L.; Urban, M.; Wagner, A.; Walcher, Th; Wambach, J.; Weis, M.; Wirzba, A.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 530, No. 1-4, 28.03.2002, p. 67-73.

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

Kohl, M, Bartsch, P, Baumann, D, Bermuth, J, Böhm, R, Bohinc, K, Derber, S, Ding, M, Distler, MO, Ewald, I, Friedrich, J, Friedrich, JM, Jennewein, P, Kahrau, M, Kamalov, SS, Kozlov, A, Krygier, KW, Kuss, M, Liesenfeld, A, Merkel, H, Merle, P, Müller, U, Neuhausen, R, Pospischil, T, Potokar, M, Rangacharyulu, C, Richter, A, Rohe, D, Rosner, G, Schmieden, H, Schrieder, G, Seimetz, M, Širca, S, Suda, T, Tiator, L, Urban, M, Wagner, A, Walcher, T, Wambach, J, Weis, M & Wirzba, A 2002, 'Self energies of the pion and the Δ isobar from the ³He(e, e′π⁺)³H reaction', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 530, no. 1-4, pp. 67-73. https://doi.org/10.1016/S0370-2693(02)01345-X

Kohl, M. ; Bartsch, P. ; Baumann, D. ; Bermuth, J. ; Böhm, R. ; Bohinc, K. ; Derber, S. ; Ding, M. ; Distler, M. O. ; Ewald, I. ; Friedrich, J. ; Friedrich, J. M. ; Jennewein, P. ; Kahrau, M. ; Kamalov, S. S. ; Kozlov, A. ; Krygier, K. W. ; Kuss, M. ; Liesenfeld, A. ; Merkel, H. ; Merle, P. ; Müller, U. ; Neuhausen, R. ; Pospischil, Th ; Potokar, M. ; Rangacharyulu, C. ; Richter, A. ; Rohe, D. ; Rosner, G. ; Schmieden, H. ; Schrieder, G. ; Seimetz, M. ; Širca, S. ; Suda, T. ; Tiator, L. ; Urban, M. ; Wagner, A. ; Walcher, Th ; Wambach, J. ; Weis, M. ; Wirzba, A. / Self energies of the pion and the Δ isobar from the ³He(e, e′π⁺)³H reaction. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2002 ; Vol. 530, No. 1-4. pp. 67-73.

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title = "Self energies of the pion and the Δ isobar from the 3He(e, e′π+)3H reaction",

abstract = "In a kinematically complete experiment at the Mainz microtron MAMI, pion angular distributions of the 3He(e,e′π+)3H reaction have been measured in the excitation region of the Δ resonance to determine the longitudinal (L), transverse (T), and the LT interference part of the differential cross section. The data are described only after introducing self-energy modifications of the pion and Δ-isobar propagators. Using Chiral Perturbation Theory (ChPT) to extrapolate the pion self energy as inferred from the measurement on the mass shell, we deduce a reduction of the π+ mass of Δmπ+ = (-1.7-2.1+1.7) MeV/c2 in the neutron-rich nuclear medium at a density of p = (0.057-0.057+0.085) fm-3. Our data are consistent with the Δ self energy determined from measurements of π0 photoproduction from 4He and heavier nuclei.",

keywords = "Delta resonance region, Few-body system, He, Longitudinal-transverse separation, Medium effects, Pion electroproduction, Self energy",

author = "M. Kohl and P. Bartsch and D. Baumann and J. Bermuth and R. B{\"o}hm and K. Bohinc and S. Derber and M. Ding and Distler, {M. O.} and I. Ewald and J. Friedrich and Friedrich, {J. M.} and P. Jennewein and M. Kahrau and Kamalov, {S. S.} and A. Kozlov and Krygier, {K. W.} and M. Kuss and A. Liesenfeld and H. Merkel and P. Merle and U. M{\"u}ller and R. Neuhausen and Th Pospischil and M. Potokar and C. Rangacharyulu and A. Richter and D. Rohe and G. Rosner and H. Schmieden and G. Schrieder and M. Seimetz and S. {\v S}irca and T. Suda and L. Tiator and M. Urban and A. Wagner and Th Walcher and J. Wambach and M. Weis and A. Wirzba",

note = "Funding Information: This work has been supported by the Deutsche Forschungsgemeinschaft (SFB 443 and RI 242/15-2). We are very grateful to P. Kienle who made a remark to one of us (A.R.) on the pion mass which finally led to the results presented here, and to N. Kaiser and W. Weise for stimulating discussions. ",

year = "2002",

month = mar,

day = "28",

doi = "10.1016/S0370-2693(02)01345-X",

language = "English",

volume = "530",

pages = "67--73",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "1-4",

}

TY - JOUR

T1 - Self energies of the pion and the Δ isobar from the 3He(e, e′π+)3H reaction

AU - Kohl, M.

AU - Bartsch, P.

AU - Baumann, D.

AU - Bermuth, J.

AU - Böhm, R.

AU - Bohinc, K.

AU - Derber, S.

AU - Ding, M.

AU - Distler, M. O.

AU - Ewald, I.

AU - Friedrich, J.

AU - Friedrich, J. M.

AU - Jennewein, P.

AU - Kahrau, M.

AU - Kamalov, S. S.

AU - Kozlov, A.

AU - Krygier, K. W.

AU - Kuss, M.

AU - Liesenfeld, A.

AU - Merkel, H.

AU - Merle, P.

AU - Müller, U.

AU - Neuhausen, R.

AU - Pospischil, Th

AU - Potokar, M.

AU - Rangacharyulu, C.

AU - Richter, A.

AU - Rohe, D.

AU - Rosner, G.

AU - Schmieden, H.

AU - Schrieder, G.

AU - Seimetz, M.

AU - Širca, S.

AU - Suda, T.

AU - Tiator, L.

AU - Urban, M.

AU - Wagner, A.

AU - Walcher, Th

AU - Wambach, J.

AU - Weis, M.

AU - Wirzba, A.

N1 - Funding Information: This work has been supported by the Deutsche Forschungsgemeinschaft (SFB 443 and RI 242/15-2). We are very grateful to P. Kienle who made a remark to one of us (A.R.) on the pion mass which finally led to the results presented here, and to N. Kaiser and W. Weise for stimulating discussions.

PY - 2002/3/28

Y1 - 2002/3/28

N2 - In a kinematically complete experiment at the Mainz microtron MAMI, pion angular distributions of the 3He(e,e′π+)3H reaction have been measured in the excitation region of the Δ resonance to determine the longitudinal (L), transverse (T), and the LT interference part of the differential cross section. The data are described only after introducing self-energy modifications of the pion and Δ-isobar propagators. Using Chiral Perturbation Theory (ChPT) to extrapolate the pion self energy as inferred from the measurement on the mass shell, we deduce a reduction of the π+ mass of Δmπ+ = (-1.7-2.1+1.7) MeV/c2 in the neutron-rich nuclear medium at a density of p = (0.057-0.057+0.085) fm-3. Our data are consistent with the Δ self energy determined from measurements of π0 photoproduction from 4He and heavier nuclei.

AB - In a kinematically complete experiment at the Mainz microtron MAMI, pion angular distributions of the 3He(e,e′π+)3H reaction have been measured in the excitation region of the Δ resonance to determine the longitudinal (L), transverse (T), and the LT interference part of the differential cross section. The data are described only after introducing self-energy modifications of the pion and Δ-isobar propagators. Using Chiral Perturbation Theory (ChPT) to extrapolate the pion self energy as inferred from the measurement on the mass shell, we deduce a reduction of the π+ mass of Δmπ+ = (-1.7-2.1+1.7) MeV/c2 in the neutron-rich nuclear medium at a density of p = (0.057-0.057+0.085) fm-3. Our data are consistent with the Δ self energy determined from measurements of π0 photoproduction from 4He and heavier nuclei.

KW - Delta resonance region

KW - Few-body system

KW - He

KW - Longitudinal-transverse separation

KW - Medium effects

KW - Pion electroproduction

KW - Self energy

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UR - http://www.scopus.com/inward/citedby.url?scp=0037187707&partnerID=8YFLogxK

U2 - 10.1016/S0370-2693(02)01345-X

DO - 10.1016/S0370-2693(02)01345-X

M3 - Article

AN - SCOPUS:0037187707

VL - 530

SP - 67

EP - 73

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 1-4

ER -