J. R. Forshaw, R. Sandapen
We extract the light-cone wavefunctions of the rho meson using the HERA data on diffractive rho photoproduction. We find good agreement with predictions for the distribution amplitude based on QCD sum rules and from the lattice. We also find that the data prefer a transverse wavefunction with enhanced end-point contributions.
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We show that AdS/QCD generates predictions for the rate of diffractive rho meson electroproduction that are in agreement with data collected at the HERA electron-proton collider.
We demonstrate another success of the AdS/QCD correspondence by showing that an AdS/QCD holographic light-front wavefunction for the $ρ$ meson generates predictions for the cross-sections of diffractive $ρ$ production that are in agreement with data collected at the HERA electron-proton collider.
Elastic rho production at HERA
给出了光子虚度在1 < Q^2 < 60 GeV^2范围内，强子质心能量在30 < W < 140 GeV范围内的ρ介子弹性电生的结果。讨论了（π π）质量分布的形状，并给出了截面与Q ^2、W和t（四个动量转移的平方）的关系。测量了全套rho自旋密度矩阵元素，提供了有关rho介子和光子极化状态的信息。特别地，确定纵向与横向γ ^*p截面的比率R。
We use an AdS/QCD holographic wavefunction to generate predictions for the rate of diffractive ρ-meson electroproduction that are in reasonable agreement with data collected at the HERA electron-proton collider.
We report on the results of our recent research published in [1] that shows that AdS/QCD generates predictions for the rate of diffractive ρ-meson electroproduction that are in agreement with data collected at the HERA electron-proton collider [2,3]. Preliminary results of this research were presented in [4].
We use an anti-de Sitter/Quantum Chromodynamics (AdS/QCD) holographic light-front wavefunction for the $ρ$ and $ϕ$ mesons, in conjunction with the Color Glass Condensate (CGC) dipole cross-section whose parameters are fitted to the most recent 2015 high precision HERA data on inclusive Deep Inelastic Scattering (DIS), in order to predict the cross-sections for diffractive $ρ$ and $ϕ$ electroproduction. Our results suggest that the holographic meson light-front wavefunction is able to give a simultaneous description of the $ρ$ and $ϕ$ production data provided we use a set of light quark masses …
Diffractive rho meson production has been identified as one of the important processes where saturation can be probed at a future Electron-Ion Collider (EIC). A source of uncertainty in making predictions for this process lies within the assumed form of the meson light-cone wavefunction. We report here the results of reference [1] where a Regge-inspired dipole model was used to extract this wavefunction as well as the corresponding leading twist-2 Distribution Amplitude from the current accurate HERA data. In addition, we shall check the robustness of the conclusions in reference [1] by using …
The Hard Diffraction in Vector Meson Production at HERA
在微扰QCD框架下给出了HERA弹性矢量介子产生的结果。研究了J/Psi光生和ρ电生的截面的能量依赖性。一个完整的极化分析，包括测量的15个元素的自旋密度矩阵和R=sigma_L/sigma_T，提出了ρ电生产。最后讨论了较重矢量介子（Psi'和Upperdum）的产生。
We compute the rate for diffractive $ϕ$ electro-production using the Color Glass Condensate dipole model. The model parameters are obtained from fits to the most recent combined HERA data on inclusive deep inelastic scattering. As for the $ϕ$ meson, we use an AdS/QCD holographic light front wavefunction. Our predictions are compared to the available data collected at the HERA collider.
A Four-site Higgsless Model with Wavefunction Mixing
受全息人工色模型的启发，我们讨论了一个具有非平凡波函数混合的四格点解构Higgsless模型。我们计算了模型的谱、电弱三重规范玻色子顶点，以及对于膜定域费米子，电弱参数为O（M^2_W/M^2_rho）。我们讨论了“S”消失的条件（即使对于膜定域费米子）和（不同但重叠的）条件，在这些条件下，唯象有趣的衰变a_1到W γ是非零的，并且仅被M_W/M_ρ的一个幂抑制。
Colour dipoles and rho, phi electroproduction
我们提出了一个详细的比较各种预测的衍射光矢量介子生产的HERA对撞机收集的数据。我们所有的计算都是在偶极模型的框架内进行的，并使用不同的介子光锥波函数模型。在我们考虑的任何场景中都没有自由参数。一般来说，我们发现很好的协议与数据使用相当简单的高斯激发波函数结合偶极横截面已拟合到其他数据。
We report on a successful extraction of the twist-2 and twist-3 Distribution Amplitudes (DAs) of the rho meson using the HERA data on diffractive rho photoproduction. We extract these DAs using several Colour Glass Condensate (CGC) inspired and a Regge inspired dipole models. All our extracted DAs are consistent with Sum Rules and lattice predictions.
Evidence for the Discrete Asymptotically-Free BFKL Pomeron from HERA Data
我们发现，在小x和大Q^2的情况下，次高阶重整化群改进的渐近自由BFKL Pomeron与HERA的虚光生数据有很好的拟合。领先的离散Pomeron极点定性地再现了x ~10^{-3}时HERA数据的Q^2依赖性，而使用三个领先的离散奇点的拟合定量地再现了x < 10^{-2}时HERA数据的Q^2和x依赖性。这种拟合将所有BFKL波函数的相位固定在选定的红外尺度上。
Saturation and fluctuations in the proton wavefunction at large momentum transfers in exclusive diffraction at HERA
本文提出质子几何模型，热点数量和大小随分辨率尺度演化，用单一参数描述$|t|>1.1~$GeV$^2$的非相干$t$谱，发现HERA数据对饱和尺度效应不敏感。
We predict the cross-section for diffractive $ϕ$ electroproduction within the dipole model, using a holographic meson wavefunction for the $ϕ$. For the dipole cross-section, we use the Color Glass Condensate dipole model whose parameters are fitted to the latest 2015 combined HERA data on Deep Inelastic Scattering. Choosing a strange quark mass of $0.14$ GeV, we find good agreement with the available data.
Vector Meson Photoproduction at High-t and Comparison to HERA Data
我们探索了在s >> -t和-t >> λ_QCD ^[2]区域中，γ p -> VX过程的QCD计算，其中V是矢量介子。我们比较了我们的计算J/psi，phi和ρ介子与ZEUS合作在HERA的数据，并表明，BFKL方法是一致的，即使是轻介子的数据，而两胶子交换的方法是不够的。我们还预测的微分截面的剧变和欧米茄，目前没有数据。
We extract the leading twist-2 and subleading twist-3 Distribution Amplitudes (DAs) of the rho meson using the HERA data on diffractive rho photoproduction. We do so using several Colour Glass Condensate (CGC) inspired and a Regge inspired dipole models. We find that our extracted twist-2 DA is not much model dependent and is consistent with QCD Sum Rules and lattice predictions. The extracted twist-3 DA is more model dependent but is still consistent with the Sum Rules prediction.
Diffractive electroproduction of rho meson excitations
我们利用微扰QCD和部分子-强子对偶性估计了1.3-1.8 GeV质量区间内rhoprime（1-）和rho（3-）共振的衍射电产生的截面。我们将截面和σ_L/σ_T的比值表示为Q^2的函数。我们比较的预测与衍射电生产ρ介子。我们展示了如何在HERA这样的衍射电产生测量可以探测微扰QCD“Pomeron”的功能。
Exclusive diffractive processes at HERA within the dipole picture
我们提出了一个同时分析，在一个碰撞参量依赖的饱和偶极子模型，独家衍射矢量介子（J/psi，φ和ρ）的生产，深虚康普顿散射和总伽玛 * p截面数据在HERA测量。作为运动学变量Q^2、W和t的函数测量的各种截面都得到了很好的描述，对矢量介子波函数的细节几乎不敏感。我们确定了质子中胶子密度在纵向和横向维度上的性质，包括依赖于碰撞参量的饱和标度。描述的总体成功表明了新兴胶子分布和质子形状的普遍性。
We use recent results for the gamma*L -> rhoL and gamma*T -> rhoT impact factors, computed in the impact parameter representation within the collinear factorization scheme, to get predictions for the polarized cross-sections sigmaT and sigmaL of the diffractive leptoproduction of the rho meson at high energy. In this approach the helicity amplitude is a convolution of the scattering amplitude of a color dipole with a target, together with the virtual gamma wave function and with the first moments of the rho meson wave function (in the transverse momentum space), given by the distribution ampli…
Vector Meson Production at HERA
我们表明，在一个简单的弹性矢量介子产生模型中，最低阶QCD计算正确地再现了光生和高Q2准弹性散射中rho，phi和J/psi的截面比。斜率对矢量介子质量的依赖关系也被再现。我们检验了低能数据，发现截面的能量依赖性不依赖于Q2，而可能依赖于矢量介子质量。
The QCD description of diffractive rho meson electroproduction
我们批判性地回顾了HERA能区纵向和横向极化态衍射ρ介子电生的截面σ_L和σ_T的QCD预言。我们发现，与数据相比，微扰和非微扰方法（包括与ρ介子波函数的卷积）预测的σ_T值随着Q^2的增加而下降得太快。我们提出了一个基于轻qqbar对的开放产生和部分子-强子对偶性的微扰QCD模型，它描述了高Q^2下ρ电产生数据的所有特征，特别是预测了σ_L/σ_T的令人满意的Q^2行为。我们发现，对后者的精确测量可以提供关于小x时胶子分布Q^2行为的有价值的信息。
Exclusive processes in hard electroproduction is one of the best place for understanding the factorization properties of QCD. The HERA experiment recently provided precise data for rho electroproduction, including all spin density matrix elements. From QCD, it is expected that such a process should factorize between a hard (calculable) coefficient function, and hadronic (p and rho) matrix elements. Such a factorization is up to now only proven for a longitudinaly polarized rho. Within the kt-factorization approach (valid at large s_{gamma* p}), we evaluate the impact factor of the transition g…
Partonic structure of pi and rho mesons from data on hard (semi)exclusive production of two pions off nucleon
我们用QCD在首扭水平下的形式拟合了HERA硬排他正质子反应中测量的0.5 < mpipi <1.1GeV范围内的π-π质量分布。提取的参数与价夸克在π介子中的分布以及π介子和ρ介子的分布振幅有关。我们首次测量了ρ介子分布振幅的第二盖根鲍尔系数：对于<Q^2>=21.2 GeV^2的光子虚度，测量值为$a_2^{(ρ)}= -0.10\pm 0.20 $。
Large t diffractive rho-meson photoproduction with target dissociation in ultraperipheral pA and AA collisions at LHC
我们表明，在LHC的超周边质子-离子和离子-离子碰撞中，具有快度间隙的大t矢量介子光生的研究将允许在很宽的能量范围$10^3 < s_{dipole - parton} < 10^6 GeV^2$内研究小偶极子离开部分子的弹性散射截面的能量依赖性，其中该截面预计会改变一个因子$\ge 20$。在$γp$和$γA$散射中，可获得的能量范围超过HERA达到的能量范围10倍。此外，A-依赖性的研究，这一过程将允许确定的t范围内的小偶极子的相互作用给出了占主导地位的贡献，并通过核介质和探头在一个新的方式发病的黑色磁盘制度的超相对论小$q\bar q$偶极子的传播吸收的影响进行调查。
Exclusive emissions of vector mesons in forward directions of rapidity offer us a faultless chance to probe the proton structure at small-$x$. A high-energy factorization formula is established within BFKL, given as the convolution of an impact factor depicting the forward-meson emission and of an unintegrated gluon distribution (UGD) driving the gluon evolution at small-$x$. As a nonperturbative quantity, the UGD is not well known and several models for it exist. We present recent progresses on the study of the exclusive forward $ρ$-meson leptoproduction at HERA and EIC energies, showing how …
We describe the hard leptoproduction of transversally polarized rho-meson, up to twist 3 accuracy, including 2- and 3- particles Fock-states, in the HERA kinematics of high center-of-mass energy. We first build a model based on a simple approach to the unintegrated gluon density (the parton impact factor) that we compare with H1 and ZEUS data for the ratios of helicity amplitudes T(gamma*T -> rhoT)/T(gamma*L -> rhoL) and T(gamma*T -> rhoL)/T(gamma*L -> rhoL) and get a good description of the data. We also show how saturation effects can be included in this model by extending the dipole represe…
Q^2 dependence of diffractive vector meson electroproduction
我们给出了衍射矢量介子电生截面的一般公式：γ ^* p -> Vp。我们首先计算衍射qqbar产生，然后通过在适当的质量区间投影出J^P = 1^-态来使用部分子-强子对偶性。我们比较了rho和J/psi介子衍射产生的截面对Q^2的依赖性与最近HERA的数据。我们包括了与使用偏胶子分布相关的特征Q^2依赖性。我们给出预测sigma_L/sigma_T的rho和J/psi的生产。
We present a model for the polarized cross-sections of the hard diffractive leptoproduction of rho meson in the high energy limit. Our model is based on the light-cone collinear factorization of the virtual photon to rho meson impact factor when using the impact factor representation of the helicity amplitudes of the rho meson leptoproduction. This gauge invariant treatment when expressed in impact parameter space, leads to the factorization on one hand of the color dipole scattering amplitude and on the other hand of the distribution amplitudes of the rho meson up to twist 2 and 3. We show th…
Transverse lattice calculation of the pion light-cone wavefunctions
我们用DLCQ方法求解粗横格点规范理论中的介子束缚态问题，计算了π介子的光锥波函数。在大N_c近似下，将光锥哈密顿量展开到固定晶格间距的大质量动力学场中。与以前的计算不同，我们考虑了夸克之间包含许多胶子连接场的状态的贡献，并通过结合束缚态的协方差条件，拟合物理质量M_ρ和M_pi，衰变常数f_pi，以及弦张力σ，对哈密顿量进行了重整化。对于最轻的0^{-+}态，我们得到了很好的协方差，它与π介子相同。由它的光锥波函数可以导出许多可观量，在x > 0.5的价区，经微扰演化后的夸克价结构函数与由Drell-Yan π核子数据导出的实验结构函数是一致的。此外，π分布振幅与由π γ ^* γ跃迁形状因子和衍射解离推导的实验分布一致。我们计算了一个新的可观测量，即夸克螺旋度关联的几率。我们发现一个45%的概率，价夸克螺旋排列在π。
We investigate the longitudinal and transverse polarized cross-sections of the leptoproduction of the rho meson in the high energy limit. Our model is based on the computation of the impact factor gamma*(lambda_gamma) -> rho(lambda_rho) using the twist expansion in the forward limit and expressed in the impact parameter space. This treatment involves in the final stage the twist 2 and twist 3 distribution amplitudes (DAs) of the rho meson and the dipole scattering amplitude. Taking models that exist for the DAs and for the dipole cross-section, we get a phenomenological model for the helicity …
We present a phenomenological model for the helicity amplitudes T11 and T00 of the rho meson exclusive diffractive leptoproduction in the forward limit. This model leads to a very good description of the polarized cross-sections sigmaT and sigmaL when compared to HERA data. This model is based on the impact factor representation of the helicity amplitudes. The gamma* -> rho impact factor is computed within the light-cone collinear factorization scheme, the impact parameter space representation allowing to factorize out the dipole-target amplitude. Finally our description combines a model for t…
Leptoproduction of Polarized Vector Mesons
本文介绍了基于广义手提包方法的HERA能区矢量介子轻子产生的研究现状。与主导扭转方法相反，在子过程中考虑了横向自由度以及Sudakov悬置。首次得到了纵向极化ρ介子光生截面的计算结果，与实验结果符合较好。
Diffractive photoproduction of vector mesons at large momentum transfer
在BFKL方法中研究了rho，phi和J/psi的衍射光产生以进行硬色单重态交换。计算了微分截面、能量依赖性和自旋密度矩阵元素，并与HERA的数据进行了比较。数据的总体描述相当好，除了具有错误符号的单个翻转幅度。强调了光子手征奇分量的重要性。
Testing universality of the Color Glass Condensate descriptions
微扰量子色动力学（pQCD）预言强子波函数中的小- $x$胶子应该形成色玻璃凝聚体（CGC），它具有普适性质，对所有的强子或核都是一样的。假设这一属性，在本文中，我们交叉相关的$ep$ HERA数据和$dAu$ RHIC数据的当前CGC描述。特别地，我们使用最近由Kharzeev，Kovchegov和Tuchin（KKT）提出的夸克偶极散射振幅来解释在RHIC的$dAu$碰撞中观察到的高$p_T$粒子抑制，在我们的质子和纵向结构函数的计算。我们提出了一个详细的比较，这个参数化和那些建议描述的$ep$ HERA数据。我们发现，由于其特有的依赖于能量和偶极子分离，KKT参数化是能够描述的实验$ep$数据，只有在有限的运动学范围内的光子虚拟。
Exclusive diffractive J/psi and Psi(2S) production in dipole model using a holographic AdS/QCD light front wavefunction with longitudinal confinement
本文用含纵向禁闭的全息 AdS/QCD 光前波函数结合偶极模型，拟合 HERA 的 J/psi 电产生数据，并成功预测 LHC 超周边碰撞中 J/psi 与 Psi(2S) 的产生。
The longitudinal cross section of vector meson electroproduction
本文在手袋方法框架下，结合修正微扰方法和Gaussian波函数，计算了轻矢量介子电产生的纵向截面，结果与HERA和HERMES实验数据相当吻合。
Using the charmonium light-front wavefunctions obtained by diagonalizing an effective Hamiltonian with the one-gluon exchange interaction and a confining potential inspired by light-front holography in the basis light-front quantization formalism, we compute production of charmonium states in diffractive deep inelastic scattering and ultra-peripheral heavy ion collisions within the dipole picture. Our method allows us to predict yields of all vector charmonium states below the open flavor thresholds in high-energy deep inelastic scattering, proton-nucleus and ultra-peripheral heavy ion collisi…
Mesons on a transverse lattice
研究了粗横格点规范理论中光锥哈密顿量的介子本征态。建立在以前的工作在纯规范理论，哈密顿量和它的Fock空间扩展的动力领域的权力。在主导近似中，出现在哈密顿量中的耦合通过要求恢复被截断所破坏的时空对称性而被重正化。额外的要求从手征对称性进行了讨论，并指出在实施他们的第一原则在领先的近似困难。然后进行唯象计算，其中自发破缺形式的手征对称性通过施加物理π-ρ质量分裂作为约束来建模。由此产生的哈密顿量的光锥波函数被用来计算衰变常数，形状因子和夸克的动量和自旋分布的π介子和ρ介子。扩展超出领导秩序，和第一性原理计算的影响，进行了简要的讨论。
Forward rapidity $J/ψ$ meson production in proton-nucleus collisions can be an important constraint of descriptions of the small-$x$ nuclear wavefunction. In an earlier work we studied this process using a dipole cross section satisfying the Balitsky-Kovchegov equation, fit to HERA inclusive data and consistently extrapolated to the nuclear case using a standard Woods-Saxon distribution. In this paper we present further calculations of these cross sections, studying the mean transverse momentum of the meson and the dependence on collision centrality. We also extend the calculation to backward …
In this work we analyse the theoretical uncertainties on the predictions for the photoproduction of light vector mesons in coherent pp, pA and AA collisions at the LHC energies using the color dipole approach. In particular, we present our predictions for the rapidity distribution for rh0 and phi photoproduction and perform an analysis on the uncertainties associated to the choice of vector meson wavefunctionand the phenomenological models for the dipole cross section. Comparison is done with the recent ALICE analysis on coherent production of rho at 2.76 TeV in PbPb collisions.
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