Measurement of the $\omega \to \pi^0 e^+e^-$ and $\eta \to e^+e^- \gamma$ Dalitz decays with the A2 setup at MAMI - INSPIRE

DataBETA

Measurement of the $\omega \to \pi^0 e^+e^-$ and $\eta \to e^+e^- \gamma$ Dalitz decays with the A2 setup at MAMI

P. Adlarson
(
- Uppsala U.
)
,
F. Afzal
(
- INFN, Pavia
)
,
P. Aguar-Bartolomé
(
- Kent State U.
)
,
Z. Ahmed
(
- Caltech
)
,
J.R.M. Annand
(
- Glasgow U.
)

Sep 15, 2016

18 pages

Published in:

Phys.Rev.C 95 (2017) 3, 035208

Published: Mar 22, 2017

e-Print:

1609.04503 [hep-ex]

DOI:

10.1103/PhysRevC.95.035208

PDG: PARAMETER LambdaIN omega\to\pi^0 e^+ e^-DECAY

Experiments:

MAINZ-A2

View in:

reference search62 citations

Citations per year

Abstract: (APS)

The Dalitz decays η→e+e−γ and ω→π0e+e− have been measured in the γp→ηp and γp→ωp reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron. The value obtained for the slope parameter of the electromagnetic transition form factor of η, Λη−2=(1.97±0.11tot)GeV−2, is in good agreement with previous measurements of the η→e+e−γ and η→μ+μ−γ decays. The uncertainty obtained in the value of Λη−2 is lower than in previous results based on the η→e+e−γ decay. The value obtained for the ω slope parameter, Λωπ0−2=(1.99±0.21tot)GeV−2, is somewhat lower than previous measurements based on ω→π0μ+μ−, but the results for the ω transition form factor are in better agreement with theoretical calculations, compared to earlier experiments.

Note:

19 figures, 2 tables

photon p: exclusive reaction
eta: photoproduction
omega(783): photoproduction
eta: rare decay
omega(783): rare decay
omega(783): semileptonic decay
form factor: transition
eta: radiative decay
eta: form factor
omega(783): form factor

References(54)

Figures(19)

[1]

MesonNet Workshop on Meson Transition Form Factors

E. Czerwinski
(
- Jagiellonian U.
)
,
S. Eidelman
(
- Novosibirsk, IYF and
- Novosibirsk State U.
)
,
C. Hanhart
(
- Julich, Forschungszentrum and
- JCHP, Julich and
- IAS, Julich
)
,
B. Kubis
(
- Bonn U. and
- Bonn U., HISKP
)
,
A. Kupsc
(
- Uppsala U.
)

et al.

e-Print:
- 1207.6556

[2]

Towards a data-driven analysis of hadronic light-by-light scattering

Gilberto Colangelo
(
- U. Bern, AEC and
- Bern U.
)
,
Martin Hoferichter
(
- U. Bern, AEC and
- Bern U.
)
,
Bastian Kubis
(
- Bonn U., HISKP and
- Bonn U.
)
,
Massimiliano Procura
(
- U. Bern, AEC and
- Bern U.
)
,
Peter Stoffer
(
- U. Bern, AEC and
- Bern U.
)

- Phys.Lett.B 738 (2014) 6-12
•
e-Print:
- 1408.2517
•
DOI:
- 10.1016/j.physletb.2014.09.021

[3]

Dispersion relation for hadronic light-by-light scattering: theoretical foundations

Gilberto Colangelo
(
- U. Bern, AEC and
- Bern U.
)
,
Martin Hoferichter
(
- Darmstadt, Tech. U. and
- Bern U. and
- U. Bern, AEC and
- Darmstadt, EMMI and
- Washington U., Seattle
)
,
Massimiliano Procura
(
- Vienna U. and
- U. Bern, AEC and
- Bern U.
)
,
Peter Stoffer
(
- Bonn U., HISKP and
- Bern U. and
- U. Bern, AEC
)

- JHEP 09 (2015) 074
•
e-Print:
- 1506.01386
•
DOI:
- 10.1007/JHEP09(2015)074

[4]

The Muon g-2

Fred Jegerlehner
(
- Silesia U. and
- Humboldt U., Berlin
)
,
Andreas Nyffeler
(
- Harish-Chandra Res. Inst.
)

- Phys.Rept. 477 (2009) 1-110
•
e-Print:
- 0902.3360
•
DOI:
- 10.1016/j.physrep.2009.04.003

[5]

Precision of a data-driven estimate of hadronic light-by-light scattering in the muon $g-2$ : Pseudoscalar-pole contribution

Andreas Nyffeler
(
- Mainz U., Inst. Kernphys. and
- U. Mainz, PRISMA
)

- Phys.Rev.D 94 (2016) 5, 053006
•
e-Print:
- 1602.03398
•
DOI:
- 10.1103/PhysRevD.94.053006

[6]

Anomalous magnetic moment of the muon in a dispersive approach

Vladyslav Pauk
(
- Mainz U., Inst. Kernphys. and
- U. Mainz, PRISMA
)
,
Marc Vanderhaeghen
(
- Mainz U., Inst. Kernphys. and
- U. Mainz, PRISMA
)

- Phys.Rev.D 90 (2014) 11, 113012
•
e-Print:
- 1409.0819
•
DOI:
- 10.1103/PhysRevD.90.113012

[7]

Two-hadron saturation for the pseudoscalar–vector–vector correlator and phenomenological applications

Tomas Husek
(
- Charles U.
)
,
Stefan Leupold
(
- Uppsala U.
)

- Eur.Phys.J.C 75 (2015) 12, 586
•
e-Print:
- 1507.00478
•
DOI:
- 10.1140/epjc/s10052-015-3778-x

[8]

$\eta$ and $\eta'$ decays into lepton pairs

Pere Masjuan
(
- U. Mainz, PRISMA and
- Mainz U., Inst. Kernphys.
)
,
Pablo Sanchez-Puertas
(
- U. Mainz, PRISMA and
- Mainz U., Inst. Kernphys.
)

- JHEP 08 (2016) 108
•
e-Print:
- 1512.09292
•
DOI:
- 10.1007/JHEP08(2016)108

[9]

Internal pair production associated with the emission of high-energy gamma rays

- Phys.Rev. 98 (1955) 1355-1359
•
DOI:
- 10.1103/PhysRev.98.1355

[10]

Electromagnetic Decays of Light Mesons

L.G. Landsberg
(
- Serpukhov, IHEP
)

- Phys.Rept. 128 (1985) 301-376,
- Phys. Rep. 128 ( 1985) 301-376
•
DOI:
- 10.1016/0370-1573(85)90129-2

[11]

Currents and mesons, University of Chicago Press, Chicago, USA

J.J. Sakurai

[12]

Search for $XYZ$ states in $\Lambda_b$ decays at the LHCb

Y.K. Hsiao
(
- CUPT, Chongqing and
- NCTS, Hsinchu and
- Taiwan, Natl. Tsing Hua U.
)
,
C.Q. Geng
(
- CUPT, Chongqing and
- NCTS, Hsinchu and
- Taiwan, Natl. Tsing Hua U.
)

- Phys.Lett.B 757 (2016) 47-49
•
e-Print:
- 1602.01236
•
DOI:
- 10.1016/j.physletb.2016.03.055

[13]

Radiative corrections to the Dalitz decay $\pi^0\to e^+e^-\gamma$ revisited

- Phys.Rev.D 92 (2015) 5, 054027
•
e-Print:
- 1504.06178
•
DOI:
- 10.1103/PhysRevD.92.054027

[14]

Investigation of $\eta$ Meson Electromagnetic Structure in $\eta \to \mu^+ \mu^- \gamma$ Decay

R.I. Dzhelyadin
(
- Serpukhov, IHEP
)
,
S.V. Golovkin
(
- Serpukhov, IHEP
)
,
V.A. Kachanov
(
- Serpukhov, IHEP
)
,
A.S. Konstantinov
(
- Serpukhov, IHEP
)
,
V.F. Konstantinov
(
- Serpukhov, IHEP
)

et al.

- Phys.Lett.B 94 (1980) 548,
- Sov.J.Nucl.Phys. 32 (1980) 516,
- Yad.Fiz. 32 (1980) 998-1001
•
DOI:
- 10.1016/0370-2693(80)90937-5

[15]

Study of the electromagnetic transition form-factors in eta ---> mu+ mu- gamma and omega ---> mu+ mu- pi0 decays with NA60

NA60

Collaboration

•

R. Arnaldi
(
- Turin U. and
- INFN, Turin
)

et al.

- Phys.Lett.B 677 (2009) 260-266
•
e-Print:
- 0902.2547
•
DOI:
- 10.1016/j.physletb.2009.05.029

[16]

Determination of the eta-transition form factor in the gamma p ---> p eta ---> p gamma e+ e- reaction

H. Berghauser
(
- Giessen U.
)
,
V. Metag
(
- Giessen U.
)
,
A. Starostin
(
- UCLA
)
,
P. Aguar-Bartolome
(
- Mainz U., Inst. Kernphys.
)
,
L.K. Akasoy
(
- Mainz U., Inst. Kernphys.
)

et al.

- Phys.Lett.B 701 (2011) 562-567
•
DOI:
- 10.1016/j.physletb.2011.06.069

[17]

New determination of the $\eta$ transition form factor in the Dalitz decay $\eta \to e^+e^−\gamma$ with the Crystal Ball/TAPS detectors at the Mainz Microtron

A2

Collaboration

•

P. Aguar-Bartolome
(
- Mainz U., Inst. Kernphys.
)

et al.

- Phys.Rev.C 89 (2014) 4, 044608
•
e-Print:
- 1309.5648
•
DOI:
- 10.1103/PhysRevC.89.044608

[18]

The $\eta$ transition form factor from space- and time-like experimental data

- Eur.Phys.J.C 75 (2015) 9, 414
•
e-Print:
- 1504.07742
•
DOI:
- 10.1140/epjc/s10052-015-3642-z

[19]

Pseudoscalar-exchange contribution to $(g-2)_{\mu}$ from rational approximants

Pablo Sanchez-Puertas
(
- U. Mainz, PRISMA and
- Mainz U., Inst. Kernphys.
)
,
Pere Masjuan
(
- U. Mainz, PRISMA and
- Mainz U., Inst. Kernphys.
)

e-Print:
- 1510.05607

[20]

Towards an improved understanding of $\eta \to \gamma^* \gamma^*$

S. Holz
(
- Bonn U., HISKP and
- U. Bonn, Phys. Inst., BCTP
)
,
J. Plenter
(
)
,
C.W. Xiao
(
- Julich, Forschungszentrum and
- IAS, Julich and
- JCHP, Julich and
- Central South U., Changsha
)
,
T. Dato
(
- Bonn U., HISKP
)
,
C. Hanhart
(
- Julich, Forschungszentrum and
- IAS, Julich and
- JCHP, Julich
)

et al.

- Eur.Phys.J.C 81 (2021) 11, 1002
•
e-Print:
- 1509.02194
•
DOI:
- 10.1140/epjc/s10052-021-09661-0

[21]

Dispersive analysis for $\eta\to \gamma\gamma^*$

C. Hanhart
(
- JCHP, Julich and
- IAS, Julich and
- Julich, Forschungszentrum
)
,
A. Kupśc
(
- Warsaw, Inst. Nucl. Studies and
- Uppsala U.
)
,
U.-G. Meißner
(
- IAS, Julich and
- Bonn U. and
- JCHP, Julich and
- Julich, Forschungszentrum and
- Bonn U., HISKP
)
,
F. Stollenwerk
(
- Julich, Forschungszentrum
)
,
A. Wirzba
(
- Julich, Forschungszentrum and
- IAS, Julich and
- JCHP, Julich
)

- Eur.Phys.J.C 73 (2013) 12, 2668,
- Eur.Phys.J.C 75 (2015) 6, 242 (erratum)
•
e-Print:
- 1307.5654
•
DOI:
- 10.1140/epjc/s10052-013-2668-3

[22]

Anomalous decay and scattering processes of the $\eta$ meson

Bastian Kubis
(
- Bonn U. and
- Bonn U., HISKP
)
,
Judith Plenter
(
- Bonn U., HISKP
)

- Eur.Phys.J.C 75 (2015) 6, 283
•
e-Print:
- 1504.02588
•
DOI:
- 10.1140/epjc/s10052-015-3495-5

[23]

Study of the Electromagnetic Transition Form-factor in $\omega \to \pi^0 \mu^+ \mu^-$ Decay

R.I. Dzhelyadin
(
- Serpukhov, IHEP
)
,
S.V. Golovkin
(
- Serpukhov, IHEP
)
,
A.S. Konstantinov
(
- Serpukhov, IHEP
)
,
V.F. Konstantinov
(
- Serpukhov, IHEP
)
,
V.P. Kubarovsky
(
- Serpukhov, IHEP
)

et al.

- Phys.Lett.B 102 (1981) 296,
- JETP Lett. 33 (1981) 228
•
DOI:
- 10.1016/0370-2693(81)90879-0

[24]

Electromagnetic transition form factors of light vector mesons

Carla Terschlusen
(
- Giessen U.
)
,
Stefan Leupold
(
- Uppsala U.
)

- Phys.Lett.B 691 (2010) 191-201
•
e-Print:
- 1003.1030
•
DOI:
- 10.1016/j.physletb.2010.06.033

[25]

Electromagnetic Transitions in an Effective Chiral Lagrangian with the $\eta'$ and Light Vector Mesons

- Eur.Phys.J.A 48 (2012) 190
•
e-Print:
- 1204.4125
•
DOI:
- 10.1140/epja/i2012-12190-6

1-25 of 54
1
2
3
25 / page