P - pomeron 中文 - EN166

pomeron n.【物理學】玻密子。

pomfret
For high energy proton - proton elastic scattering , the cross section has been calculated from exchanging pomeron theory , such as these calculations have been performed for differential cross section at the energy of = 53gev and the total cross section , for differential cross section , below the momentum transform and for total cross section at s > 10 the pomeron exchange theory reproduce the experimental data very well 對于高能質子?質子彈性散射，我們利用交換pomeron理論獲得其散射截面。廣的帥他人學顧論義我們分別計算了在入時能撾為人53 ev的微分散射徽而和總散射截面，結果我們得劍。
The knowledge of these initial collision is crucial for any theoretical treat - ment of a possible parton - hadron phase transition , the detection of which being the ultimate aim of all the efforts of co1liding heavy ions at very high energies . the parton model allows to calculate inclusive cross sections as a convolution of any elementary cross section with parton distribution functions , assuming that factorization works . the disadvantage is that tlle first interaction is coilsidered quite differently from the subsequent ones in case of multiple scattering 其它的弦模型在計算幾率時，忽略了入射能量在pomeron之間的分配，破壞了能量守恒，而且把pomeron作為全同粒子處理，即pomeron之間是不可區分的；然而在處理粒子產生時，這些模型雖然考慮了能量守恒，但是第一個pomeron的粒子產生與其它的pomeron很不一樣? ? pomeron在粒子產生時不是全同的。
The hard process is included in a natural way , which offers the opportunity to calculate the parton spectra and parton density which aie closely related to the forinatioi1 of quark gluon plasma . the strict calculation is performed on the parton level , however , hadrons are finally observable particles 而pomeron與remnant之間的關聯，以及pomeron之間的關聯，則通過補償夸克(或感應夸克)來實現? ?每當一個海夸克或一個反夸克從真空中激發出來作為pomeron的色弦端點時，它的反粒子也從真空中激發出來，進入到相鄰的remnant中。
So cross section and particle production are not calculated consistently . and it is difficult for gri5ov - regge theory to include hard process . the parton 6ased gri6ov - regge theory provide a solution : elementary scatterings happen in parajlel , described phenomenologically as pomeron exchanges 因此，在nexus中pomeron的色弦形成方式就與其它模型很不相同；即使只有一個pomeron交換，色弦的端點也是海夸克和反夸克，而不是價夸克。
It is natural to suppose that pomeron exchange is just the exchange of several gluons , at least two , and these gluons couple to a same single quark 我們很自然的想到交換pomeron的過程對應于交換幾個膠子，至少應該是兩個膠子，而且這些膠子應該和質子內部的同一夸克相藕合。
Another approach , the gri6ov - regge theory allows multiple interactions to happen in par - allel . the energy needs to be shared among elementary interactions Nexus模型按自洽性的要求，在能量守恒的條件下計算不同pomeron數目對應的幾率，并且使得pomeron是全同的。
Therefore , we can study these short distance phenomena by use of multigluon exchange among the quarks , which carries quantum numbers of vacuum 因此，我們能夠通過應用夸克之間多膠子交換過程來研究這些短程現象，它們具有pomeron所應該有的真空量子數。
With the development of quantum chromodynamics ( qcd ) , people started to investigate the origin and nature of the pomeron from qcd viewpoint 隨著量子色動力學( qcd )理論的發展，人們開始用qcd的觀點去探討pomeron本源和性質。
The monte carlo simulation offers a systematic and efficient way to study this unknown realm by qualitative comparisons to the experiments Pomeron是多重散射中交換的一種唯象粒子，在粒子產生過程中用兩根色弦來表示。
That is well taken into account when calculating particle production , but not when cal - culating cross section 無論是處理幾率計算還是粒子產生，無論是第一個pomeron還是多個pomeron都如此。
However , the origin and nature of the pomeron is still unknown 對于pomeron的存在，理論上也有許多爭論。