نتایج جستجو برای: pi

تعداد نتایج: 44133  

Let $G$ be a group and $H$ a subgroup of $G$‎. ‎ $H$ is said to have semi-$Pi$-property in $G$ if there is a subgroup $T$ of $G$ such that $G=HT$ and $Hcap T$ has $Pi$-property in $T$‎. ‎In this paper‎, ‎investigating on semi-$Pi$-property of subgroups‎, ‎we shall obtain some new description of finite groups‎.

Journal: :bulletin of the iranian mathematical society 0
a. liu school of applied mathematics‎, ‎chengu information technology‎, ‎chengdu 610225‎, ‎p‎. ‎r‎. ‎china. q. chen college of science‎, ‎hohai university‎, ‎nanjing 210098‎, ‎p‎.‎r‎. ‎china; yancheng institute of technology‎, ‎yancheng 224051‎, ‎p‎.‎r‎. ‎china.

let $g$ be a group and $h$ a subgroup of $g$‎. ‎ $h$ is said to have semi-$pi$-property in $g$ if there is a subgroup $t$ of $g$ such that $g=ht$ and $hcap t$ has $pi$-property in $t$‎. ‎in this paper‎, ‎investigating on semi-$pi$-property of subgroups‎, ‎we shall obtain some new description of finite groups‎.

Journal: :journal of agricultural science and technology 2010
gh. r. rafiee s. hajirezaee

the changes of total calcium content of persian sturgeon, acipenser persicus follicles were investigated during different stages of germinal vesicle migration. total calcium content increased during maturation and ripening of the oocytes i.e. migration of nucleus toward the animal pole. according to data, the total calcium of follicles with polarization index (pi: the ratio of the distance of t...

Journal: :Physical review. D, Particles and fields 1996
Beneke Rothstein

In this talk I review the recent progress made in the calculations of quarkonia production in fixed target experiments. NRQCD organizes the calculations in a systematic expansion in αs and v, the relative velocity between the heavy quarks. Within this formalism there are octet contributions which are not included in the color singlet model. These contributions depend upon unknown matrix element...

2017
Zhi-Tian Zou Ying Li Xin Liu

In this work, we attempt to study the Cabibbo-Kobayashi-Maskawa-favored [Formula: see text] ("S" denoting the scalar meson) decays within the perturbative QCD approach at the leading order and the leading power. Although the light scalar mesons are widely perceived as primarily the four-quark bound states, in practice it is hard for us to make quantitative predictions based on the four-quark pi...

1997
Masayasu Harada

In this talk I summarize a recently proposed mechanism to understand ππ scattering to 1 GeV. The model is motivated by the 1/NC expansion to QCD, and includes a current algebra contact term and resonant pole exchanges. Chiral symmetry plays an important role in restricting the form of the interactions. The existence of a broad low energy scalar (σ) is indicated.

Journal: :Physical review letters 2000
Haberzettl

The relevance of the axial current for pion production processes off the nucleon with real or virtual photons is revisited. Employing the hypothesis of a partially conserved axial current (PCAC), it is shown that, when all of the relevant contributions are taken into account, PCAC does not provide any additional constraint for threshold production processes that goes beyond the Goldberger-Treim...

Journal: :Physical review letters 2008
C M Tarbert D P Watts P Aguar J Ahrens J R M Annand H J Arends R Beck V Bekrenev B Boillat A Braghieri D Branford W J Briscoe J Brudvik S Cherepnya R Codling E J Downie K Föhl D I Glazier P Grabmayr R Gregor E Heid D Hornidge O Jahn V L Kashevarov A Knezevic R Kondratiev M Korolija M Kotulla D Krambrich B Krusche M Lang V Lisin K Livingston S Lugert I J D Macgregor D M Manley M Martinez J C McGeorge D Mekterovic V Metag B M K Nefkens A Nikolaev R Novotny R O Owens P Pedroni A Polonski S N Prakhov J W Price G Rosner M Rost T Rostomyan S Schadmand S Schumann D Sober A Starostin I Supek A Thomas M Unverzagt Th Walcher F Zehr

We present the first detailed measurement of incoherent photoproduction of neutral pions to a discrete state of a residual nucleus. The 12C(gamma,pi(0))(12)C*(4.4 MeV) reaction has been studied with the Glasgow photon tagger at MAMI employing a new technique which uses the large solid angle Crystal Ball detector both as a pi(0) spectrometer and to detect decay photons from the excited residual ...

Journal: :Physical review letters 1995
van den Brink HB Blok Bobeldijk Bouwhuis Dodge Harakeh Hesselink Ireland de Jager CW Jans de Jonge N Kalantar-Nayestanaki Kasdorp Ketel Konijn Lapikás van Leeuwe JJ van der Meer RL Nooren Norum Passchier Pellegrino Spaltro van der Steenhoven G Steijger Templon Theunissen van Uden MA de Vries H de Vries R de Witt Huberts PK

The neutral pion electroproduction on the proton is considered in the framework phenomenological model based on the PCAC, current algebra with hard pions and chiral symmetry breaking interaction. The swave differential cross-section of the electroproduction of neutral pions off protons near the threshold is predicted as function photon momentum transfer squared k2 . The swave multipoles ReE0+ a...

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