Using a model based on two elements: the Good-Walker mechanism for low mass diffraction and multi-pomeron interactions for high mass diffraction, we obtain an excellent description of all aspects of soft scattering at high energy. The parameters of the model are determined by a fit to experimental data, giving the slope of pomeron to be $α'_{IP} \approx 0.01 GeV^{-2}$. We calculate the survival probability of diffractive Higgs production, and obtained a value for this observable, which is smaller than 1% for the LHC energy range.
We present the approximated analytic expressions for the muon survival probability in a $3+1$ mixing scenario in the presence of matter effect using the S-matrix formalism. We find that all the individual terms contributing to the muon survival probability can significantly reduce to just three contributions. The leading order contribution comes from the three flavor muon survival probability followed by the two sub-leading contributions arising from active-sterile mixing. Furthermore, to more simplify the results we adopt the well known series expansion relations about mass-hierarchy paramete…
Energy dependence of the survival probability of large rapidity gap
在假定高斯不透明度的Eikonal模型中计算了大快度能隙（LRG）$< \mid S \mid^2 >$的生存概率与能量的关系。确定$< \mid S \mid^2 >$的参数直接从实验数据中进行评估，而无需进一步求助于模型。我们发现，$< \mid S \mid^2 >$随着能量的增加而减少，与最近的结果在Tevatron的LRG dijet生产。
Solar neutrino oscillations are supported by KamLAND's antineutrino measurements, but certain solar neutrino data - the observed shape of the ${}^8$B flux and the difference between day and night counting rates measured in Super-Kamiokande - do not fit well with the ensuing oscillation pattern. Interestingly, other solar neutrino data allow independent tests of the survival probability. Thanks to the new measurements of Borexino at low-energies along with the standard solar model and to the results of SNO at high-energies, four values of the neutrino survival probability are known. We build an…
We discuss the mechanisms of photon-photon fusion triggering the dilepton production in proton-proton collisions with rapidity gap in the main detector and one forward proton in the forward proton detectors. This correspond to the LHC measurements made by ATLAS+AFP and CMS+PPS. Transverse momenta of the intermediate photons and photon fluxes expressed by the form factors and structure functions are included. Moreover the influence of proton measurement and cuts on the $ξ_{1/2}$, $M_{ll}$, $Y_{ll}$, $p_{t,ll}$ distributions, cross section and gap survival factor are considered for both double-e…
Rapidity gap survival in central exclusive diffraction: Dynamical mechanisms and uncertainties
本文总结了我们对中心排他衍射pp -> p + H + p（H =大质量系统）中快度间隙生存的动力学机制的理解，并讨论了目前生存概率估计的不确定性。衍射散射的主要抑制是由于在小PP碰撞参量下的非弹性软旁观者相互作用，并且可以在平均场近似（独立的硬和软相互作用）中描述。适度的额外抑制来自碰撞质子的部分子组态的涨落。在LHC能量下，与gg -> H过程相关的硬旁观者部分子的吸收相互作用达到了黑盘区，并引起了大量的额外抑制，使生存概率低于0.01。
Recently a lot of progress has been made in deriving the heavy quark potential within a QCD medium. In this article we have considered heavy quarkonium in a hot quark gluon plasma phase. The heavy-quark potential has been modeled properly for short as well as long distances. The potential at long distances is modeled as a QCD string which is screened at the same scale as the Coloumb field. We have numerically solved the 1+1-dimensional Schrodinger equation for this potential and obtained the eigen wavefunction and binding energy for the $1S$ and $2S$ states of charmonium and bottomonium. Furth…
We analyse in detail the role of additional hadron-hadron interactions in elastic photon-initiated (PI) production at the LHC, both in $pp$ and heavy ion collisions. We first demonstrate that the source of difference between our predictions and other results in the literature for PI muon pair production is dominantly due to an unphysical cut that is imposed in these latter results on the dimuon-hadron impact parameter. We in addition show that this is experimentally disfavoured by the shape of the muon kinematic distributions measured by ATLAS in ultraperipheral PbPb collisions. We then consid…
