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meson

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meson n.1.【物理學】介子，重電子。2.【動物；動物學】正中...

n. 1.【物理學】介子，重電子。 2.【動物；動物學】正中面。 adj. -ic “meson-meson effect“ 中文翻譯：   介子相互作用“british meson“ 中文翻譯：   【物理學】介子。 “capture of meson“ 中文翻譯：   介子的獲俘“charged meson“ 中文翻譯：   帶電介子“charmed meson“ 中文翻譯：   餐介子“el meson“ 中文翻譯：   埃爾梅松“eta meson“ 中文翻譯：   η介子“exotic meson“ 中文翻譯：   外來介子“heavy meson“ 中文翻譯：   重介子“k meson“ 中文翻譯：   k介子; 重介子“k-meson“ 中文翻譯：   k介子“light meson“ 中文翻譯：   輕介子“longitudinal meson“ 中文翻譯：   縱介子“meson blaster“ 中文翻譯：   介子沖擊波“meson capture“ 中文翻譯：   介子俘獲“meson cloud“ 中文翻譯：   介子云“meson cyclotron“ 中文翻譯：   介子回旋加速器“meson exchange“ 中文翻譯：   介子交換“meson factory“ 中文翻譯：   介子工廠〔能產生強烈介子射線以探索原子核的粒子加速器〕。 “meson field“ 中文翻譯：   介子場“meson irradiation“ 中文翻譯：   介子輻照“meson physics“ 中文翻譯：   介子物理學“meson producer“ 中文翻譯：   ①介子發生器②介子工廠“yukawa meson“ 中文翻譯：   湯川介子“meson beam guiding system“ 中文翻譯：   介子束導向系統“mesomyzon mengae“ 中文翻譯：   孟氏中生鰻

meson factory

As for the k production in high energy hics , we firstly study k + production . the results show that the kaon flow is sensitive to both the kaon - nucleon sigma term ( s and the equation of state of nuclear matter . the collective flows of both nucleons and k + mesons need a “ soft “ eos with compressibility k ? 00 - 300 mev , and 2 = 200 - 400 mev seems suitable to explain the measured k + flow 研究表明k ~ +集體流在相對論重離子碰撞中對核態方程和k - n標量吸引項( _ ( kn ) )都是敏感的，計算結果表明核子和k ~ +介子的橫向集體流都需要壓縮系數在k 200 - 300mev范圍內較軟的核態方程，而大約為200 - 400mev的_ ( kn )值對解釋k ~ +流產生是合適的。

In high energy nucleus - nucleus collisons , cc pairs are produced through short - distance scattering process among partons . after the point - like cc pairs form , they can be dissociated by partonic and final hadronic matter . not only mesons but also baryons in final haronic matter contribute to the dissociation of cc 在高能核一核相互作用中，由于部分子間的短程散射過程誘導產生cc對，這些類點cc對形成后，離解的原因有來自于部分子的作用，也有來自于末態強子物質的誘導。

The nucleon dbhf self - energy in the nuclear medium , therefore , can be calculated with the g matrix in the relativistic hartree - fock approximation . with the calculated nucleon self - energy in the dbhf , we extract nucleon effective interactions hi the framework of the relativistic mean field theory ( rmf ) , which contains the effect of the nucleon - nucleon short - range correlation and information of the isospin structure . applying the effective interaction , which is composed of density dependent meson - nucleon coupling constants , we study the properties of finite nuclei and come to some useful conclusions 本文應用相對論dirac - brueckner - hartree - fock ( dbhf )方法，利用新的g矩陣分解方式g = v + g ，用g矩陣在相對論hartree - fock近似下，即等效的dbhf方法，系統地討論了對稱、不對稱核物質及中子物質的性質，利用對稱及不對稱核物質中自能的dirac結構，我們提取出含有核子-核子短程關聯效應和同位旋結構信息的有效相互作用介子耦合常數，并對有限核的性質做了詳細的討論，得到不少有意義的結果。

We further find that anti - flow appears at certain large impact parameter , which seems to be more sensitive to 2 and might provide more definite information of the magnitude of 2 . the absorption effect of k - mesons is also studied , we find although there exists strong k - absorption , k - spectrum can still contain the messages of at “ in nuclear medium 接著我們又研究了k ~ -介子的吸收問題，發現雖然有強烈的k ~ -吸收存在，其能譜在不太重的核系統的非中心碰撞中仍顯示出對為的依賴，有可能提供k在核介質中性質的知識。

The contribution to the giant resonances from the currents of vector mesons are also examined , it shows that currents of vector mesons play an important role in collective giant resonances . by studying the properties of collective multipole excitations of nuclei , a general conclusion is that those effective lagrangians recently developed can well describe not only the nuclear ground state properties of finite nuclei , stable and unstable ones up to the nuclei drip lines , but also the collective excited states and giant resoancnes in doubly closed shell nuclei 通過對核的電多極巨共振性質的研究，我們發現現有的這些非線性的有效相互作用不但能夠很好地描述有限核的基態性質，包括球形和變形核以及遠離穩定線核，而且對一些雙滿殼核的集體激發態和巨共振性質也能進行合理地解釋，包括巨共振峰的位置和中心能量。

The effective coupling constants including isoscalar and mesons and isovector and mesons in the rmf are extracted from the dbhf results in symmetric and asymmetric nuclear matter . two sets of effective interactions in the rmf approach are deduced by imposing a condition , where the dbhf scalar and . vector self - energy or scalar self - energy and binding energy per nucleon at each density and asymmetry parameter are reproduced , respectively 為了使我們提取的有效相互作用能夠準確地再現出dbhf計算的核狀態方程以及密度依賴的不對稱能，我們采用第二種萬法提取有效介子核子耦合常數，即要求在對稱核物質中，每個密度處ilif計算出的標量自能及總結合能與dbhf給出的標量自能及總結合能一致，提取出。

Very recently , schiller and muether at tubingen university suggested a new decomposition approach of the dbhf g matrix , and used to calculate the nucleon self - energy . they , sepa rate the g matrix into a bare nucleon - nucleon interaction v and correction term a g . the projection method is only applied to the correlation term a g , which is parameterized by four pseudo - mesons . then the nucleon self - energy in the dbhf can be calculated with the g matrix in the relativistic hartree - fock approximation 裸相互作用部分，即單玻色子交換勢v對核子dirac自能結構的貢獻可以通過相對論hartree - fock方法得到，只把關聯部分用投影方法處理，并參數化為四種具有無窮大質量贗介子的交換，耦合常數與質量的比值是常數，從而關聯部分g對核子自能的貢獻也可以通過相對論hartree - fock方法求得。

Second , we obtain a new quark potential from the effective dilaton - gluon - coupling inspired by superstring theory and devote more effects to understand this new confinement generating mechanism through the investigation of the phenomenological application of this interquark potential in the heavy mesons sector 其次，由超弦理論啟發的伸縮子?膠子有效耦合，給出了一種新的夸克勢，并在重介子系統中研究了這個勢提供的禁閉機制。

A significant difference on the scalar self - energy and effective mass of neutrons in asymmetric nuclear matter , especially in neutron matter , is observed . the difference would result in an unreasonable sigh of the extracted effective couplings for isovector mesons 利用這樣的耦合常數在rmf近似下計算的核物質的結合能與dbhf結果會有偏離，因而得到的核狀態方程也會有偏離，如在飽和點處結合能有小于2的偏差。

We calculate the spin - average energy levels of heavy mesons and analyze the influence of model parameters to energy levels . the obtained results are compared with that of other potentials and agree with the available data 在重介子系統中研究了這個新的夸克勢，計算了一些重介子系統的自旋平均能譜，分析了模型參數對能譜的影響，所得能譜與其它勢的結果作了比較，并與實驗上肯定的數據符合較好。

This thesis is organized in two parts : the first part of this thesis focuses on strangeness production at sps energies . the strange baryon and strange meson pro - duction at sps energies are modeled via luciae model which includes the reseat ter - ing 我們的工作目標主要集中在用建立在強子和弦機制上的高能核反應模型- luciae ，模擬wa97和na49實驗中的奇異重子和奇異介子產生的數據。

Furthermore , we consider the vacuum color screening correction to cornell potential and find corrected potential gives a better fit to energy levels and mean - square - root ( m . s . r ) radii for heavy mesons , including j and t families 在此基礎上，我們考慮真空色屏蔽效應對cornell勢的修正，發現具有色屏蔽效應的勢對重介子( j和家族)的能譜給出了更為合理的解釋。

By widening the width of gaussian transverse momentum distribution in string fragmentation . luciae reproduced the o mesons rapidity distribution , transverse mass distribution , and also the enhancement factor of o meson in pb - pb relative to p - p collisions 介子； ‘ ’ ‘土影響不人， lu 1模擬的結果同時大明：通過加寬弦碎裂為叨對的內稟描動量分布的寬度， 。

It is known that the meson is the lightest hadron and hence plays a significant role in the phenomenology of low - to - intermediate - energy nuclear physics as mediator of the long - range part of hadron - hadron interactions 眾所周知，介子這種最輕的強子作為強子-強子相互作用的長程部分的中介，在低中能核物理的研究中扮演了一個很重要的角色。

In the theoretical framework of the relativistic mean field , the influences of ( superscript - ) meson condensate on the equation of state and the particle fractions of neutron star matter including delta isobars are studied 摘要在相對論平均場理論框架下研究了(上標- )介子凝聚對包括共振態的中子星物質狀態方程及其粒子分布的影響。

The interacting potential among quarks includes the contributions of coulomb - like , confinement and loop - originating correction . the wave functions describing meson and baryon are composed of orbital , color , spin and flavor Illler tye勢描述夸克之間的相互作用，它包含類庫侖作用、囚禁作用和源于圈圖修正的貢獻。

It indicates that a correct mass relation of a meson nonet ( especially for the non ideal - mixing meson nonet ) should incorporate the effect of the flavor - dependent quarkonia annihilation 這表明，一個正確反映介子九重態（特別是非理想混合的介子九重態）成員間質量關系的公式，應該包含夸克偶素間的湮滅跟味道有關這種修正。

In this thesis , we derive a new quark potential by constructing the effective theory of quantum chromodynamics ( qcd ) with dilation inspired by superstring theory and study this new quark potential in heavy mesons sector 本文構建了一種有伸縮子( dilaton )的量子色動力學( qcd )有效理論，得到了一種新的夸克相互作用勢。

In the frame of gcm , by introducing the chemical potential of baryons in this paper , we have found an effective method to study some properties of tt meson in a nuclear matter with finite density 在gcm理論框架下通過將化學勢引入雙定域場和有效作用量，本文找到一種有效的方法研究介子在有限密度核物質中的一些性質。