有哪些信誉好的足球投注网站- 1、本文档共22页，可阅读全部内容。
- 2、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。
- 3、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
查看更多
Moment-operator expansion for the two-meson, two-photon and fermion-antifermion states
a
r
X
i
v
:
h
e
p
-
p
h
/
0
1
0
5
3
3
0
v
2
1
1
S
e
p
2
0
0
1
Moment–operator expansion for the two-meson,
two-photon and fermion-antifermion states
A.V. Anisovich, V.V. Anisovich, V.N. Markov,
M.A. Matveev and A.V. Sarantsev
St. Petersburg Nuclear Physics Institute, 188300, Gatchina, Russia
Abstract
A complete set of formulae in terms of the moment–operator expansion is pre-
sented for the two-meson, two-photon and fermion-antifermion states that can be
used in the analysis of scalar (S) and pseudoscalar (P ) meson production in pp? and
γγ collisions: pp? → SS,PP, SP and γγ → SS,PP, SP . Method of a generalization
of the formulae for amplitudes of multi-meson production in the two-stage processes
of the type (spin-j) resonance + meson → three mesons is also discussed.
1 Introduction
The moment–operator expansion is a powerful tool for the study of the analytical structure
of amplitudes, in particular, for the determination of the resonance amplitudes.
In this paper we present a full set of formulae which are necessary for the analysis
of reactions pp? → ππ, pp? → ηη, pp? → ηη′, pp? → πf0 in flight, and we explain the
way of generalization of the formulae for the analysis of reactions with the production of
resonances with non-zero spin, such as πρ, πf2, ππ2, and so on.
The data obtained by Crystal Barrel Collaboration provide us with rich possibilities
to study resonances in the mass region 1900-2400 MeV [1, 2]. The reconstruction of
analytical meson amplitudes and definition of pole singularities are forced by the problem
of classification of meson states, exotics included (glueballs, hybrids). The establishing of
a complete set of meson states is a necessary step in understanding of Strong QCD, see
e.g. [3, 4, 5, 6].
We give formulae for γγ-states; our interest in these processes is stimulated by rich
experimental information on γγ → hadrons obtained at LEP (e.g. see [7, 8]).
Starting from early 1960s, the operator expansion was exploited for the amplitude
a
您可能关注的文档
- LEEG pressure sensor.pdf
- LEEG monosilicon pressure sensor.pdf
- LEEG pressure transmitter.pdf
- Leica Photogrammetry Suite_ProductDescription_En.pdf
- Leil Lowndes - Conversation Confidence - Workbook.doc
- LEMWA33X70GX1000_G_Gen2_specsheet_0.0(3535 G2 5700K).pdf
- LensVector-未来的AF发展.pdf
- Leptogenesis, neutrino mixing data and the absolute neutrino mass scale.pdf
- Lesson 8 what’s your job.ppt
- lesson 1 Private conversation.ppt
文档评论（0）