Search for quadrupole strength in the electroexcitation of the Δ+(1232)

被引：136

作者：

Mertz, C ^{[1
]}

Vellidis, CE

Alarcon, R

Barkhuff, DH

Bernstein, AM

Bertozzi, W

Burkert, V

Chen, J

Comfort, JR

Dodson, G

Dolfini, S

Dow, K

Farkhondeh, M

Finn, JM

Gilad, S

Gothe, RW

Jiang, X

Joo, K

Kaloskamis, NI

Karabarbounis, A

Kelly, JJ

Kowalski, S

Kunz, C

Lourie, RW

McIntyre, JI

Milbrath, BD

Miskimen, R

Mitchell, JH

Papanicolas, CN

Perdrisat, CF

Sarty, AJ

Shaw, J

Soong, SB

Tieger, D

Tschalær, C

Turchinetz, W

Ulmer, PE

Van Verst, S

Warren, GA

Weinstein, LB

Williamson, S

Woo, RJ

Young, A

机构：

[1] Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA

[2] Univ Athens, Inst Accelerating Syst & Applicat, Athens, Greece

[3] Univ Athens, Dept Phys, Athens, Greece

[4] Univ Virginia, Inst Nucl & Particle Phys, Charlottesville, VA 22901 USA

[5] Univ Virginia, Dept Phys, Charlottesville, VA 22901 USA

[6] MIT, Nucl Sci Lab, Dept Phys, Cambridge, MA 02139 USA

[7] MIT, Bates Accelerator Ctr, Cambridge, MA 02139 USA

[8] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA

[9] Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA

[10] Univ Bonn, Dept Phys, D-5300 Bonn, Germany

[11] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA

[12] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[13] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[14] Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA

[15] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.86.2963

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

High-precision H-1(e,e 'p)pi (0) measurements at Q(2) = 0.126 (GeV/c)(2) are reported, which allow the determination of quadrupole amplitudes in the gamma *N --> Delta transition; they simultaneously test the reliability of electroproduction models. The derived quadrupole-to-dipole (I = 3/2) amplitude ratios, R-SM = (-6.5 +/- 0.2(stat+sys) +/- 2.5(mod))% and R-EM = (-2.1 +/- 0.2(stat+sys) +/- 2.0(mod))%, are dominated by model error. Previous R-SM and R-EM results should be reconsidered after the model uncertainties associated with the method of their extraction are taken into account.

引用

页码：2963 / 2966

页数：4

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