Measurements of H-polarized D-polarized (gamma-polarized, pi) and Implications for Convergence of the GDH Integral - INSPIRE

DataBETA

Measurements of H-polarized D-polarized (gamma-polarized, pi) and Implications for Convergence of the GDH Integral

LSC

Collaboration

•

S. Hoblit
(
- Virginia U. and
- Brookhaven
)

Aug, 2008

4 pages

Published in:

Phys.Rev.Lett. 102 (2009) 172002

e-Print:

0808.2183 [hep-ex]

DOI:

10.1103/PhysRevLett.102.172002

Experiments:

BNL-LEGS

View in:

reference search39 citations

Citations per year

Abstract: (arXiv)

We report new measurements of inclusive pion production from frozen-spin HD for polarized photon beams covering the Delta(1232) resonance. These provide data simultaneously on both H and D with nearly complete angular distributions of the spin-difference cross sections entering the Gerasimov-Drell-Hearn (GDH) sum rule. Recent results from Mainz and Bonn exceed the GDH prediction for the proton by 22 microbarns, suggesting as yet unmeasured high-energy components. Our pi0 data reveal a different angular dependence than assumed in Mainz analyses and integrate to a value that is 18 microbarns lower, suggesting a more rapid convergence. Our results for deuterium are somewhat lower than published data, considerably more precise and generally lower than available calculations.

13.60.Hb
13.60.Le
25.20.Lj
14.20.Gk
photon nucleon: inelastic scattering
pi: photoproduction
photon: polarized beam
polarized target
hydrogen: deuterium
sum rule: Drell-Hearn-Gerasimov

References(21)

Figures(4)

A Sum rule for magnetic moments and the damping of the nucleon magnetic moment in nuclei

S.B. Gerasimov
(
- Dubna, JINR
)

- Sov.J.Nucl.Phys. 2 (1966) 430-433,
- Yad.Fiz. 2 (1965) 598-602

Exact Sum Rule for Nucleon Magnetic Moments

S.D. Drell
(
- SLAC
)
,
Anthony C. Hearn
(
- Stanford U., ITP
)

- Phys.Rev.Lett. 16 (1966) 908-911
•
DOI:
- 10.1103/PhysRevLett.16.908

- Prog.Theor.Phys. 36 425

- Prog.Theor.Phys. 36 426

Use of causality conditions in quantum theory

- Phys.Rev. 95 (1954) 1612-1627,
•
DOI:
- 10.1103/PhysRev.95.1612

LOW-ENERGY THEOREMS, DISPERSION RELATIONS AND SUPERCONVERGENCE SUM RULES FOR COMPTON SCATTERING

- Phys.Rev. 165 (1968) 1594-1609
•
DOI:
- 10.1103/PhysRev.165.1594

The Gerasimov-Drell-Hearn sum rule and current algebras

- Phys.Lett.B 329 (1994) 514-518
•
e-Print:
- hep-ph/9403286
•
DOI:
- 10.1016/0370-2693(94)91097-9

Experimental Check of the Gerasimov-Drell-Hearn Sum Rule for H-1

H. Dutz
(
- Bonn U.
)
,
K. Helbing
(
- Erlangen - Nuremberg U.
)
,
J. Krimmer
(
- Tubingen U.
)
,
T. Speckner
(
- Erlangen - Nuremberg U.
)
,
G. Zeitler
(
- Erlangen - Nuremberg U.
)

et al.

- Phys.Rev.Lett. 93 (2004) 032003
•
DOI:
- 10.1103/PhysRevLett.93.032003

Experimental Check of the Gerasimov-Drell-Hearn Sum Rule for H-1

H. Dutz
(
- Bonn U.
)
,
K. Helbing
(
- Erlangen - Nuremberg U.
)
,
J. Krimmer
(
- Tubingen U.
)
,
T. Speckner
(
- Erlangen - Nuremberg U.
)
,
G. Zeitler
(
- Erlangen - Nuremberg U.
)

et al.

- Phys.Rev.Lett. 93 (2004) 032003
•
DOI:
- 10.1103/PhysRevLett.93.032003

Measurement of the Gerasimov-Drell-Hearn Integrand for H-2 from 200-MeV to 800-MeV

J. Ahrens
(
- Mainz U., Inst. Kernphys.
)
,
S. Altieri
(
- INFN, Pavia and
- Pavia U.
)
,
J.R.M. Annand
(
- Glasgow U.
)
,
H.-J. Arends
(
- Mainz U., Inst. Kernphys.
)
,
R. Beck
(
- Mainz U., Inst. Kernphys.
)

et al.

- Phys.Rev.Lett. 97 (2006) 202303
•
DOI:
- 10.1103/PhysRevLett.97.202303

Analysis of pion photoproduction data

R.A. Arndt
(
- George Washington U.
)
,
W.J. Briscoe
(
- George Washington U.
)
,
I.I. Strakovsky
(
- George Washington U.
)
,
R.L. Workman
(
- George Washington U.
)

- Phys.Rev.C 66 (2002) 055213
•
e-Print:
- nucl-th/0205067
•
DOI:
- 10.1103/PhysRevC.66.055213

A Unitary isobar model for pion photoproduction and electroproduction on the proton up to 1-GeV

- Nucl.Phys.A 645 (1999) 145-174
•
e-Print:
- nucl-th/9807001
•
DOI:
- 10.1016/S0375-9474(98)00572-7

Leading and higher twists in the proton polarized structure function g**p(1) at large Bjorken x

S. Simula
(
- INFN, Rome3
)
,
M. Osipenko
(
- Moscow State U.
)
,
G. Ricco
(
- INFN, Genoa and
- Genoa U.
)
,
M. Taiuti
(
- INFN, Genoa and
- Genoa U.
)

- Phys.Rev.D 65 (2002) 034017
•
e-Print:
- hep-ph/0107036
•
DOI:
- 10.1103/PhysRevD.65.034017

Experimental verification of the GDH sum rule

GDH

Collaboration

•

K. Helbing
(
- Erlangen - Nuremberg U., Theorie III and
- LBL, Berkeley
)

for the collaboration.

- Prog.Part.Nucl.Phys. 50 (2003) 451-462
•
DOI:
- 10.1016/S0146-6410(03)00039-5

N ---> delta transition and proton polarizabilities from measurements of p (gamma polarized, gamma), p (gamma polarized, pi0), and p (gamma polarized, pi+)

et al.

- Phys.Rev.C 64 (2001) 025203
•
DOI:
- 10.1103/PhysRevC.64.025203

Precision HD polarimetry with the LEGS crossed-coil NMR polarimeter

Craig Thorn
(
- Brookhaven
)
,
Anthony Caracappa
(
- Brookhaven
)

- AIP Conf.Proc. 980 (2008) 1, 397-402
•
DOI:
- 10.1063/1.2888114

Single and double pi0 photoproduction from the deuteron

et al.

- Eur.Phys.J.A 6 (1999) 309-324
•
DOI:
- 10.1007/s100500050349

Incoherent pion photoproduction on the deuteron with polarization observables. II. Influence of final state rescattering

- Phys.Rev.C 72 (2005) 064005
•
e-Print:
- nucl-th/0506018
•
DOI:
- 10.1103/PhysRevC.72.064005

Measurement of the reaction $\gamma d \to \pi^- pp$ , and determination of cross-sections for the reaction $\gamma n \to \pi^- p$ , at photon energies between 0.2-GeV and 2.0-GeV

Aachen-Bonn-Hamburg-Heidelberg-Muenchen

Collaboration

•

P. Benz
(
- DESY and
- Hamburg U.
)

et al.

- Nucl.Phys.B 65 (1973) 158-209
•
DOI:
- 10.1016/0550-3213(73)90280-0

Photoproduction of Charged pi Mesons from Hydrogen and Deuterium in the Energy Range Between 250-MeV and 790-MeV

et al.

- Nucl.Phys.B 120 (1977) 395-422
•
DOI:
- 10.1016/0550-3213(77)90084-0

Helicity dependence of the $\gamma p\to N \pi$ channels and multipole analysis in the $\Delta$ region

GDH and
A2

Collaborations

•

J. Ahrens

et al.

- Eur.Phys.J.A 21 (2004) 2, 323-333
•
DOI:
- 10.1140/epja/i2003-10216-x