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首页质子上ω介子光生反应的精密测量:新数据揭示细节
本文主要探讨的是质子上ω介子的光生过程,具体是通过CBELSA/TAPS实验来研究γp→pω反应的微分截面和非极化自旋密度矩阵元素。这项研究的焦点在于初始光子能量范围从反应阈值到2.5 GeV,这是对高能物理学领域的一个重要贡献,因为这个能量范围内包含了丰富的粒子相互作用信息。实验通过测量ω介子的辐射衰减,即ω→π0γ,来间接获取关于γp→pω反应的信息。 研究的结果展示了横截面在整个角度范围内覆盖,并揭示了t通道前向上升的完整特性。这一发现对于理解质子与光子之间的基本相互作用,以及探索强相互作用在高能下的行为具有重要意义。特别是,文章首次利用了能量范围在1150 MeV至1650 MeV的线性极化标记光子束来提取极化自旋密度矩阵元素,这进一步深化了我们对这一过程的精细结构和极化性质的理解。 CBELSA/TAPS协作组由来自多个研究机构的物理学家组成,他们共同进行实验并分析数据,这些机构包括赫尔姆霍茨辐射和核物理研究所等,这体现了国际科学合作的力量。论文发表在《物理快报B》(Physics Letters B)上,该期刊是物理学领域的重要学术期刊,Open Access的形式使得研究成果可以更广泛地被学术界和公众所访问。 这篇论文不仅提供了γp→pω反应的新测量数据,还提供了对高能光子与质子相互作用的深入见解,有助于理论模型的验证和完善,同时推动了实验技术和数据分析方法的发展。对于那些对强子物理学、核物理和高能光子学感兴趣的科研人员来说,这是一个不可或缺的研究成果。
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Physics Letters B 749 (2015) 407–413
Contents lists available at ScienceDirect
Physics Letters B
www.elsevier.com/locate/physletb
Photoproduction of ω mesons off the proton
CBELSA/TAPS Collaboration
A. Wilson
a,b
, V. Crede
b,∗
, A.V. Anisovich
a,c
, J.C.S. Bacelar
e
, B. Bantes
d
, O. Bartholomy
a
,
D. Bayadilov
a,c
, R. Beck
a
, Y.A. Beloglazov
c
, K.T. Brinkmann
f
, R. Castelijns
e
, H. Dutz
d
,
D. Elsner
d
, R. Ewald
d
, F. Frommberger
d
, M. Fuchs
a
, Chr. Funke
a
, R. Gregor
f
, A. Gridnev
c
,
E. Gutz
f,a
, J. Hannappel
d
, W. Hillert
d
, P. Hoffmeister
a
, I. Horn
a
, I. Jaegle
g
, T. Jude
d
,
J. Junkersfeld
a
, H. Kalinowsky
a
, V. Kleber
d
, Frank Klein
d
, Friedrich Klein
d
, E. Klempt
a
,
M. Kotulla
g,f
, B. Krusche
g
, M. Lang
a
, H. Löhner
e
, I.V. Lopatin
c
, S. Lugert
f
, T. Mertens
g
,
J.G. Messchendorp
e,f
, V. Metag
f
, M. Nanova
f
, V.A. Nikonov
a,c
, D. Novinski
c
, R. Novotny
f
,
M. Ostrick
d
, L.M. Pant
f
, H. van Pee
a
, M. Pfeiffer
f
, A. Roy
f
, A.V. Sarantsev
a,c
, C. Schmidt
a
,
H. Schmieden
d
, S. Shende
e
, V. Sokhoyan
a
, N. Sparks
b
, A. Süle
d
, V.V. Sumachev
c
,
T. Szczepanek
a
, U. Thoma
a
, D. Trnka
f
, R. Varma
f
, D. Walther
a,d
, Ch. Wendel
a
,
U. Wiedner
h
a
Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, Germany
b
Department of Physics, Florida State University, Tallahassee, FL 32306, USA
c
Petersburg Nuclear Physics Institute, RU-188350 Gatchina, Russia
d
Physikalisches Institut, Universität Bonn, D-53115 Bonn, Germany
e
KVI, 9747 AA Groningen, The Netherlands
f
II. Physikalisches Institut, Universität Gießen, D-35392 Gießen, Germany
g
Physikalisches Institut, Universität Basel, CH-4056 Basel, Switzerland
h
Institut für Experimentalphysik I, Ruhr-Universität Bochum, D-44780 Bochum, Germany
a r t i c l e i n f o a b s t r a c t
Article history:
Received
10 February 2015
Received
in revised form 23 July 2015
Accepted
4 August 2015
Available
online 7 August 2015
Editor:
D.F. Geesaman
Keywords:
Meson
production
Light
mesons
Baryon
resonances
Photoproduction
reactions
The differential cross sections and unpolarized spin-density matrix elements for the reaction γ p → pω
were measured using the CBELSA/TAPS experiment for initial photon energies ranging from the reaction
threshold to 2.5 GeV. These observables were measured from the radiative decay of the ω meson, ω →
π
0
γ . The cross sections cover the full angular range and show the full extent of the t-channel forward
rise. The overall shape of the angular distributions in the differential cross sections and unpolarized
spin-density matrix elements are in fair agreement with previous data. In addition, for the first time,
abeam of linearly-polarized tagged photons in the energy range from 1150 MeV to 1650 MeV was used
to extract polarized spin-density matrix elements.
These
data were included in the Bonn–Gatchina partial wave analysis (PWA). The dominant contribution
to ω photoproduction near threshold was found to be the 3/2
+
partial wave, which is primarily
due to the sub-threshold N(1720) 3/2
+
resonance. At higher energies, pomeron-exchange was found
to dominate whereas π -exchange remained small. These t-channel contributions as well as further
contributions from nucleon resonances were necessary to describe the entire dataset: the 1/2
−
, 3/2
−
,
and 5/2
+
partial waves were also found to contribute significantly.
© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP
3
.
*
Corresponding author.
E-mail
address: crede@fsu.edu (V. Crede).
1. Introduction
The spectrum of excited states has historically given essential
information on the nature of any composite quantum system. The
http://dx.doi.org/10.1016/j.physletb.2015.08.011
0370-2693/
© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by
SCOAP
3
.
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