Inclusive One Jet Production With Multiple Interactions in the Regge Limit of pQCD
G. P. Vacca
考虑了在regge极限下双核子系统的分布交互作用。在这个框架内，给出了一个审查的pQCD方法的计算包含一个喷流产生截面在有限数量的颜色和讨论的一般结果。
DIS on a two nucleon system in the regge limit is considered. In this framework a review is given of a pQCD approach for the computation of the corrections to the inclusive one jet production cross section at finite number of colors and discuss the general results.
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PQCD Analysis of Inclusive Heavy Hadrons Decays
我们发展了包含重强子衰变的微扰QCD形式。引入部分子的横向自由度，使重强子衰变的分解变得容易。
Regge description of spin-spin asymmetry in photon diffractive dissociation
我们探讨了胶子螺旋度分布$ΔG(x)$是否可以从$γp$衍射深度非弹性散射中纵向自旋-自旋不对称性$A_{LL}$的实验数据与微扰QCD（pQCD）框架内进行的计算的比较中提取。这些数据可以在未来的HERA对撞机上获得，用于极化质子的极化电子/正电子散射。在本文中，我们寻找这样的运动学区域的贡献$A_{LL}$从软过程（reggeon交换）被抑制，以保证pQCD的适用性。结果表明，对于质心能量$s_{γp} \geq 10^3 GeV^2$、强子衍射质量$M_X \leq 10 GeV/c^2$、转移到质子上的动量$Δ_T\leq 0.5 GeV/c$和$Q^2\geq4 (GeV/c)^2$的平方，由reggeon交换引起的纵向自旋-自旋不对称性小于10^{-4}.这个值大概低于可以用现代实验技术测量的不对称性。这意味着pQCD预测可以可靠地与该运动学区域的数据进行比较。
We consider inclusive hadroproduction of jets, prompt photons, b-jets, and D-mesons in the quasi-multi-Regge-kinematics approach based on the hypothesis of gluon and quark Reggeization in t-channel exchanges at high energies. The data taken by the CDF and D0 Collaborations at the Fermilab Tevatron are well described without adjusting parameters. We find the main contribution to inclusive jet production to be the scattering of two Reggeized gluons, described by the effective Reggeon-Reggeon-gluon vertex, and to b-jet and D-meson production --- the scattering of a Reggeized gluon and a Reggeized…
PQCD study of the $B_{SL}$ and $n_c$ controversy in inclusive $B$ decays
利用微扰QCD方法计算了包含$B$介子衰变的半轻子分支比和粲计数。对于非轻子衰变，我们采用修正的因子分解定理，其中Wilson系数随衰变模的特征标度演化。结果表明，在不增加$n_c$的情况下，单粲模$b\to c{\bar u}d$的衰减速率增加，得到较低的$B_{SL}$.我们预测一个更大的$b\to c τ\barν$分支比相比，从传统的重夸克有效理论为基础的算子乘积展开。我们对$B$介子寿命的计算结果也与实验数据一致。
We consider b-jet production in the quasi-multi-Regge-kinematics approach based on the hypothesis of the gluon and quark Reggeization in the t-channel exchanges at the high energy. The data on various spectra of b-jet production measured by the CDF and D0 Collaborations at the Tevatron Collider are described well and with no free parameters.
New Effective Feynman-like Rules for the Multi-Regge QCD Asymptotics of Inclusive Multijet Production
在多Regge区中，定义了适用于包容性多射流截面的新的有效类费曼规则。BFKL方程的解被用作起点。由此产生的规则涉及共形重量和快度作为动量和坐标分别和平移不变的坐标。我们使用有效的规则来计算包含多喷流产生的超高能渐近性。对部分子密度的依赖性只发生在渐近截面的整体归一化中。
In this paper, the inclusive Pomeron-Pomeron, Reggeon-Reggeon, Pomeron-Reggeon as well as gluon-Pomeron(-Reggeon) and photon-Pomeron(-Reggeon) interactions for the $\rm η_{c}$ at the LHC energies have been examined in proton-proton, proton-nucleus and nucleus-nucleus collision modes. The cross section has been computed based on the NRQCD factorization and Regge theory formalism. The cross exchange of Pomeron-Reggeon contribution is important in $\rm pp$ and $\rm pA$ modes. The Pomeron-Pomeron contribution is significant in $\rm AA$ mode. The Pomeron contribution is considerable for $\rm AA$ an…
This perturbative Quantum Chromo Dynamics (pQCD) analysis attempts to present a simultaneous determination of parton distribution functions (PDFs) and the strong coupling $α_s(M^2_Z)$ from inclusion of inclusive H1 and ZEUS jet, DiJets and TriJets production cross sections data on the HERA I and II combined data, as the central data sets for probing the internal structure of proton. To present an accurate pQCD analysis, we separate the role and influence of inclusion jet production cross sections data from inclusion of the strong coupling $α_s(M^2_Z)$ as an extra fit parameter parameter on the…
We study inclusive $b$-jet and $b\bar b$-dijet production at the CERN LHC invoking the hypothesis of gluon Reggeization in $t$-channel exchanges at high energy. The $b$-jet cross section includes contributions from open $b$-quark production and from $b$-quark production via gluon-to-bottom-pair fragmentation. The transverse-momentum distributions of inclusive $b$-jet production measured with the ATLAS detector at the CERN LHC in different rapidity ranges are calculated both within multi-Regge kinematics and quasi-multi-Regge kinematics. The $b\bar b$-dijet cross-section is calculated within qu…
Deep inelastic scattering and prompt photon production within the framework of quark Reggeization hypothesis
在准多Regge运动学方法的框架下，应用夸克Regge化假设，研究了ep深度非弹性散射和瞬发光子的包容产生。本文描述了假设虚光子从质子经有效γ-Reggeon-夸克顶点散射到Reggeized夸克上的结构函数F_2和F_L。结果表明，在p \bar p碰撞中，包含性瞬发光子产生的主要机制是一个Reggeized夸克和一个Reggeized反夸克通过有效的Reggeon-Reggeon-gamma顶点融合成一个光子.我们描述了包含光子横向动量谱测量的CDF和D 0合作的误差内，没有自由参数，使用Kimber-Martin-Ryskin未积分的夸克和胶子分布函数的质子。
PQCD analysis of inclusive semileptonic decays of B mesons
我们发展了包含半轻子$B$介子衰变的微扰QCD形式，其中包含了由带电轻子能量高端附近的大辐射修正的重新确认引起的Sudakov抑制.通过引入部分子的横向自由度，简化了$B$介子衰变的因子分解。这样就避免了夸克级分析中出现的歧义。根据基于重夸克有效场论的算子乘积展开，构造了一个由$b$夸克的非微扰费米运动产生的普适分布函数，并将分布函数的平均值和宽度与定域算符的强子矩阵元联系起来.给出了$B\to X_u\ellν$衰变的带电轻子谱。我们发现在光谱的端点附近有50%的抑制。自由夸克模型对总衰变率的总体抑制为8%，而使用光滑分布函数对总衰变率的总体抑制小于7%.与我们的预测，它是可以提取Cabibbo-Kobayashi-Maskawa矩阵元素$|V_{ub}|$从实验数据。我们还讨论了我们的分析可能的影响时，面对相当小的观测到的半轻子分支比$B$介子衰变。
We evaluate differential cross sections for production of four jets in multi-Regge kinematics at a hadron collider. The main focus lies on azimuthal angle dependences. As in previous studies, the ratios of correlation functions of products of cosines of azimuthal angle differences among the tagged jets offer us the cleanest quantities to compare with experimental data. The calculations are based on the jet production from a single BFKL ladder with a convolution of three BFKL Green functions where we always have two forward/backward jets tagged in the final state. We also demand the tagging of …
PQCD Analysis of Inclusive Semileptonic Decays of A Polarized Lambda_b Baryon
本文利用修正的包含Sudakov抑制的微扰QCD方法研究了极化Lambda_b重子包含半轻子衰变中的Lambda_b极化问题。根据HQEFT，我们证明了在1/M_b展开的首阶，极化和非极化分布函数成为一个单一的普适分布函数。为了探讨决定极化Lambda_b重子自旋性质的机制，我们构造了四种形式：朴素夸克模型（QM）、修正的夸克模型（MQM）、朴素部分子模型（PM）和修正的部分子模型（MPM），并计算了它们相应的Lambda_b极化，记为P.修正的夸克和部分子模型具有Sudakov抑制。所得P分别为-0.23（QM）、-0.94（MQM）、-0.37（PM）和-0.68（MPM）。我们注意到P_MQM（=-0.94）非常接近Z -> b bar{b}过程中Z顶点处的b夸克极化不对称性A_RL=-0.94，P_MPM（=-0.68）也非常接近由重夸克极限下的碎裂过程估计的λ_b极化（=-0.68）。根据我们的分析，在理论解释的Lambda_b偏振的实验数据不存在任何悖论。
A study of differential cross sections for the production of three and four jets in multi-Regge kinematics is presented. The main focus lies on the azimuthal angle dependences in events with two forward/backward jets are tagged in the final state. Furthermore, the tagging of one or two extra jets in more central regions of the detector with a relative separation in rapidity from each other is requested. It is found that the dependence of the cross sections on the transverse momenta and the rapidities of the central jet(s) can offer new means of studying the onset of BFKL dynamics.
Prompt photon photoproduction at HERA within the framework of the quark Reggeization hypothesis
我们研究的框架内的准多Regge运动学方法，应用夸克Regge化假设的孤立提示光子的包容性生产。本文精确地描述了HERA对撞机光生过程中瞬发光子的横动量谱和赝快度谱。结果表明，γ p碰撞中包含性瞬发光子产生的主要机制是质子的Reggeized夸克（反夸克）和光子的共线反夸克（夸克）通过有效的Reggeon-quark-gamma顶点融合成光子.通过γ-Reggeon-夸克顶点和夸克-Reggeon-夸克顶点产生的夸克碎裂成光子被隔离锥条件强烈抑制，并且仅在大的负赝快度区域中产生显著贡献。在数值计算阶段，我们使用Kimber-Martin-Ryskin处方的未整合的夸克和胶子分布函数，与以下共线部分子密度作为输入：MRST的质子和GRV的光子。
Recently, new observables in LHC inclusive events with three tagged jets were proposed. Here, we extend that proposal to events with four tagged jets. The events are characterised by one jet in the forward direction, one in the backward direction with a large rapidity distance $Y$ from the first one and two more jets tagged in more central regions of the detector. In our setup, non-tagged associated mini-jet multiplicity is present and needs to be accounted for by the inclusion of BFKL gluon Green functions. The projection of the cross section on azimuthal-angle components opens up the opportu…
A study of differential cross sections for the production of four jets in multi-Regge kinematics is presented, the main focus lying on azimuthal angle dependences. The theoretical setup consists in the jet production from a single BFKL ladder with a convolution of three BFKL Green functions, where two forward/backward jets are always tagged in the final state. Furthermore, the tagging of two further jets in more central regions of the detectors with a relative separation in rapidity from each other is requested. It is found, as result, that the dependence on the transverse momenta and the rapi…
Inclusive Direct Photon and Pion Production in Proton Nucleon Collisions
本文研究了强子相互作用中包含直接光子和中性π介子的产生，重点比较了光子和π介子产额的比值与次领先阶微扰QCD（NLO pQCD）的期望值.
The Scale Dependence of Inclusive ep Scattering in the Resonance Region
我们研究了包含ep散射共振区的尺度依赖性。特别是，我们讨论了Q^2以外的不变量，这些不变量已被提出作为运动学区域中pQCD演化的标度，在该区域中，红外奇异性和功率修正都被认为是最大的。我们表明，目前大部分数据可用的区域，可以描述使用非线性光学pQCD演化在固定不变质量，W^2，加上一个领先的顺序功率校正项。我们发现，在W^2 < 4 GeV^2处的功率修正系数相对较小，即与在大W^2区域中获得的功率修正系数大小相当。
We consider b-jet hadroproduction in the quasi-multi-Regge-kinematics approach based on the hypothesis of gluon and quark Reggeization in t-channel exchanges at high energies. The preliminary data on inclusive b-jet and b anti-b-dijet production taken by the CDF Collaboration at the Fermilab Tevatron are well described without adjusting parameters. We find the main contribution to inclusive b-jet production to be the scattering of a Reggeized gluon and a Reggeized b-quark to a b quark, which is described by the effective Reggeon-Reggeon-quark vertex. The main contribution to b anti-b-pair prod…
NLO inclusive jet production in $k_T$--factorization
利用QCD微扰理论中的$k_T$ -次领先阶因子分解（NLO）研究了快度中心区喷注的包容产生。利用NLO BFKL结果在Regge限值中进行计算。本文引入了射流锥的定义，并对多Regge和准多Regge运动学区域进行了适当的相空间分离。讨论了两种情况：散射的高度虚拟的光子，这需要一个对称的能量尺度分离的胶子格林函数的影响因素，和强子-强子碰撞，其中一个非--对称尺度的选择是必要的。
Hard and Soft Contributions in Diffraction
我们计算了衍射结构函数F_2^D的对数斜率，这是区分衍射结构函数F_2^D和衍射结构函数F_2^D的一个潜在的观测量，它可以用来区分衍射结构函数F_2^D和衍射结构函数F_2^D的Regge域.
Recent PQCD calculations of heavy quark production
本文总结了最近对冷核物质中重夸克产生和衰减的研究结果。在p+p碰撞中，我们研究了微扰QCD中部分子过程对$D$介子产生和$D$介子触发的包含双强子到最低阶的相对贡献.虽然胶子融合主导了大角度$D\bar{D}$对的产生，但光部分子散射的魅力决定了单个包含性$D$介子的产率。$c$夸克到$D$介子的非微扰碎裂与夸克和胶子到轻强子的非微扰碎裂的明显不同导致远离侧的粲触发喷流的反粲含量的强横向动量依赖性。在p+A反应中，我们计算并恢复了介质中末态部分子散射的相干核增强功率修正。我们发现，单和双包容性的开放魅力生产可以抑制一样多的中性π介子从动态高扭曲阴影的产量。在非相干的Bertsch-Gunion极限下，还研究了p+A碰撞中能量损失的影响，并可能导致核衰减的横向动量依赖性明显减弱.
On the inclusive gluon jet production from the triple pomeron vertex in the perturbative QCD
用正则化胶子方法研究了三重坡密子顶点胶子喷注产生的单包含截面和双包含截面。结果表明，为了满足AGK规则，顶点必须是完全对称的所有四个正则化胶子，形成两个最终的pomeron。对于三重坡密子顶点的不同切割，得到了单包含截面。它们之和为Yu.Kovchegov和K.Tuchin在色偶极图中得到的表达式。所发现的双包容截面满足AGK规则。
We study single jet and prompt-photon inclusive hadroproduction with multi-Regge kinematics invoking the hypothesis of parton Reggeization in t-channel exchanges at high energy. In this approach, the leading contributions are due to the fusion of two Reggeized gluons into a Yang-Mills gluon and the annihilation of a Reggeized quark-antiquark pair into a photon, respectively. Adopting the Kimber-Martin-Ryskin and Bluemlein prescription to derive unintegrated gluon and quark distribution functions of the proton from their collinear counterparts, for which we use the Martin-Roberts-Stirling-Thorn…
Regge Analysis of Diffractive and Leading Baryon Structure Functions from DIS
本文将DIS的H1数据和衍射结构函数作为同一个半包含过程的两个分量进行综合分析。可用的结构函数数据进行了分析，在一系列的配合，其中三个主要的交换考虑：坡密子，reggeon和π介子。对于这些贡献中的每一个，假设相应的结构函数的Regge分解。通过这个过程，我们提取的衍射，pomeron为主，区域和领先的质子光谱，这主要是由二级交换之间的接口信息。主要结果之一是，相对reggeon贡献的半包含结构函数是远远小于从单独的衍射结构函数的分析得到的。
We revisit high energy factorization for gluon mediated inclusive Deep Inelastic Scattering (DIS) for which we propose a new semi-classical approach that accounts systematically for the longitudinal extent of the target in contrast with the shockwave limit. In this framework, based on a partial twist expansion, we derive a factorization formula that involves a new gauge invariant unintegrated gluon distribution which depends explicitly on the Feynman $x$ variable. It is shown that both the Regge and Bjorken limits are recovered in this approach. We reproduce in particular the full one loop inc…
Weak interactions in polarized semi-inclusive DIS
在pQCD部分子模型中，计算了自旋为1/2的强子（典型的是λ重子）在极化半包容DIS中产生的所有可能的弱相互作用情况下的极化P的表达式.我们讨论了如何收集新的信息的碎片和分布函数，并给出数值估计的情况下，数据或将很快可用。
Inclusive 1-jet Production Cross Section at Small x in QCD: Multiple Interactions
本文研究了有限色数的微扰QCD的Regge极限中两个Pomeron交换对包含单喷流产生截面的修正。通过考虑弱束缚双核子系统的深度非弹性散射，我们仔细地遵循AGK切割规则的逻辑，并显示，对于单包含截面，由于胶子的正则化，AGK切割规则的修改出现。作为我们的主要结果，我们调查和计算的射流产生的顶点存在的两个坡密子削减修正。与以往的研究相比，我们发现了一个新的结构，以前没有考虑过的射流顶点。我们讨论了这个新作品的一些含义。
A Kinematically Complete Analysis of the CLAS data on the Proton Structure Function $F_2$ in a Regge-Dual model
最近测量的包容性电子质子截面在核子共振区，在托马斯·杰斐逊实验室进行的CLAS检测器，提供了新的数据的核子结构功能$F_2$与以前无法获得的精度。在本文中，我们提出了一个描述这些实验数据的基础上的Regge对偶模型$F_2$。在模型中的基本输入是非线性复杂的Regge轨迹产生的等压共振和平滑的背景。对实验数据的模型进行了测试，并计算了力矩的$Q^2-$依赖性。结构函数的拟合模型（包括横截面）是更一般的散射振幅的极限情况，同样适用于深虚康普顿散射（DVCS）。两者之间的联系进行了讨论。
Longitudinal Lambda polarization in polarized semi-inclusive DIS
在pQCD部分子模型下，计算了在极化半包容DIS中产生的λ重子的纵向极化率的表达式，并考虑了弱相互作用效应。我们提出了一些数值估计，在少数情况下，数据或将很快提供，并讨论如何收集新的信息极化碎裂功能。
Inclusive Gluon Production in the QCD Reggeon Field Theory: Pomeron Loops Included
通过系统地考虑强子波函数中有限部分子密度的非线性效应以及散射过程中的多次重散射效应，我们继续研究了高能强子散射振幅。本文导出了当所有观测到的胶子的快度相差不大时，单胶子产生振幅和多胶子产生振幅的表达式。我们表明，在领导秩序，这些可观的表现出半经典结构。在半经典结果的基础上，我们发现胶子发射具有不同于JIMWLK和KLWMIJ极限的一些特征，即胶子在快度空间中不是独立发射的，而是具有关联长度为1阶的关联分量（在快度空间中）.我们证明了多胶子观测量的这一特征与QCD Reggeon场论（$H_{RFT}$）的哈密顿量之间的一致性，该哈密顿量是在姊妹论文\cite{rft}中导出的。我们还表明，这些观测量与总的快速的过程中产生的$H_{RFT}$的\cite{rft}。我们讨论是否这种演变是等价的演变与$H_{JIMWLK}$至于这一组的可观的关注。
Identified hadron spectra in Pb-Pb at sqrt(s) = 5.5 TeV: hydrodynamics+pQCD predictions
本文用流体力学+微扰QCD（pQCD）方法预言了LHC上Pb-Pb碰撞中的单包荷强子pT谱。
The inclusive production of light mesons in pp-scattering is considered in the framework of reggeon phenomenology with supercritical Pomeron. Available low-energy data can be explained with three reggeon particles taken into account. With the obtained results rapidity and pseudorapidity distributions for light-meson production at LHC energies are predicted.
In this letter we demonstrate that our dipole model is successful in describing the inclusive production within the same framework as diffractive physics. We believe that this achievement stems from the fact that our approach incorporates the positive features of the Reggeon approach and CGC/saturation effective theory, for high energy QC
In the Regge kinematics the amplitude for gluon production off three scattering centers is found in the Lipatov effective action technique. The vertex for gluon emission with the reggeon splitting in three reggeons is calculated and its transversality is demonstrated. It is shown that in the sum of all contributions terms containing principal value singularities are cancelled and substituted by the standard Feynman poles. These results may be used for calculation of the inclusive cross-section for gluon production on two nucleons in the nucleus.
Single transverse spin asymmetries for semi-inclusive pion production in DIS
本文提出了一种描述包含强子产生中单横自旋不对称性的唯象方法。通过在自旋相关的夸克分布函数和碎裂函数中引入夸克内禀运动，推广了高能大p_T强子产生过程（A+B -> C+X）的pQCD形式.本文着重研究极化夸克碎裂成强子过程中的自旋和k_T效应，并给出了半包容深度非弹性散射中的STSA预言，l + p -> pion + X和gamma^* + p -> pion + X.
In this paper, we investigate the inclusive diffractive hadroproduction for $\rm η_{c}$ and $\rm η_{b}$ at the LHC energies. Based on the NRQCD factorization formalism and the resolved-Pomeron model for the quarkonium production mechanism, we estimate the rapidity, momentum fraction loss dependence of the cross section. We give prediction ratios for single and central diffractive processes with respect to non diffractive process. These inclusive processes are sensitive to gluon content of Pomeron for small-$x$ and Reggeon for large-$x$, useful to study small and large-$x$ physics and good to t…
Global QCD Analysis, the Gluon Distribution, and High $E_t$ Inclusive Jet Data
我们报告了一个广泛的全球QCD分析新的DIS和强子包容性射流生产数据，强调这些最近的数据对胶子分布的确定的影响，并解释高$E_t$喷流CDF合作强调。这种分析的结果是（i）更好地处理了胶子分布的不确定性范围，（ii）新一代的CTEQ部分子分布包含了这种不确定性，（iii）在传统的pQCD框架中容纳高$E_t$喷流的可行方案，和（四）系统研究了各种硬过程对$α_s$的敏感性以及全球分析中$α_s$测定的一致性。
According to string theory, string ball is a highly excited long string which decays to standard model particles at the Hagedorn temperature with thermal spectrum. If there are extra dimensions, the string scale can be $\sim$ TeV, and we should produce string balls at CERN LHC. In this paper we study top quark production from string balls at LHC and compare with the parton fusion results at NNLO using pQCD. We find significant top quark production from string balls at LHC which is comparable to standard model pQCD results. We also find that $\frac{dσ}{dp_T}$ of top quarks from string balls doe…
We investigate the inclusive top quark pair production in proton-proton and proton-antiproton collisions at high energies in the framework of kt-factorization QCD approach. Our study is based on the off-shell partonic subprocesses g*g* -> QQ and q*q* -> QQ, where the transverse momentum of both incoming quarks and gluons are taken into account. The unintegrated parton densities in a proton are determined by the Kimber-Martin-Ryskin prescription as well as the CCFM evolution equation. The conservative error analisys is performed and comparison with the results of traditional NLO pQCD calculatio…
The partonic interpretation of reggeon theory models
我们回顾了reggeon场论的两个最简单模型的物理内容：即程函模型和Schwimmer模型。利用AGK切割规则得到了包含截面、非弹性截面和衍射截面。写出了这些截面的非线性方程组，并求出了其解的解析表达式。我们推导出了在Schwimmer模型及其等离子化扩展中衍射解离微分截面对快度能隙的依赖关系。从高能相互作用的部分子观点解释了结果。
Inclusive jet cross section measurements from the ATLAS, CDF, CMS, D0, H1, STAR, and ZEUS experiments are explored for determinations of the strong coupling constant $α_{\text{s}}(M_{\text{Z}})$. Various jet cross section data sets are reviewed, their consistency is examined, and the benefit of their simultaneous inclusion in the $α_{\text{s}}(M_{\text{Z}})$ determination is demonstrated. Different methods for the statistical analysis of these data are compared and one method is proposed for a coherent treatment of all data sets. While the presented studies are based on next-to-leading order i…
Screening Corrections in Photo and DIS Production of $J/Ψ$
照片和DIS生产的$J/Ψ$进行了调查，并与计算的基础上pQCD在LLA近似没有和屏蔽校正。计算中考虑了产生振幅的实部、偏态（非对角）胶子结构函数和粲偶素系统中的相对论费米运动引起的修正。我们的pQCD结果也比较了从Regge型2 Pomeron模型得到的预测。我们的研究结果表明，我们的筛选模型有一定的偏好，但现有的数据并不能使我们排除任何三个模型，我们已经检查。当外推到低能量和非常高的能量时，这些模型的属性可以提供不同参数化之间的更有效的区分。
We study the inclusive hadroproduction of D^0, D^+, D^star+, and D_s^+ mesons at leading order in the parton Reggeization approach endowed with universal fragmentation functions fitted to $e^+e^-$ annihilation data from CERN LEP1. We have described $D$-meson transverse momentum distributions measured in the central region of rapidity by the CDF Collaboration at Tevatron (|y|<1) and ALICE Collaboration at LHC (|y|<0.5) within uncertainties and without free parameters, using Kimber-Martin-Ryskin unintegrated gluon distribution function in a proton. The forward D-meson production (|y|>2.0) measur…
Heavy quarkonium production in the framework of the non-relativistic quantum chromodynamics and leading order of the parton Reggeization approach at the Tevatron and LHC is discussed. In this note, we compare our predictions for the bottomonium production at the LHC due to the color-singlet approximation of the non-relativistic quantum chromodynamics with CMS and LHCb data. It is found, that in the production of Upsilon(1S) states, the color-singlet mechanism is dominating, whereas to describe the data for the inclusive Upsilon(2S) and Upsilon(3S) production, the color- octet contributions sho…
Leading order pQCD hadron production and nuclear modification factors at RHIC and the LHC
本文评述了主序pQCD中的强子产生。单包容粒子谱的形状很好地描述了$p_T \geq 2-3$ GeV的质心能量从20 GeV到2 TeV。发现现象学K因子随着$\sqrt{s}$而系统地降低。对于超相对论重离子反应，考虑了初始多部分子散射和末态辐射能量损失的影响，计算得到了扩充。基线CERN-LHC预测的强子生产的$p+p$和抑制在中央$Pb+Pb$反应在$\sqrt{s} = 5.5$ TeV的给出在BNL-RHIC和CERN-SPS能量的相应结果进行比较。
We investigate the inclusive Higgs boson production in proton-proton collisions at high energies in the framework of kt-factorization QCD approach. The attention is focused on the dominant off-shell gluon-gluon fusion subprocess, where the transverse momentum of incoming gluons are taken into account. The transverse momentum dependent (or unintegrated) gluon densities of the proton are determined using the CCFM evolution equation as well as the Kimber-Martin-Ryskin prescription. We study the theoretical uncertainties of our calculations and perform the comparison with the results of traditiona…
We study the inclusive hadroproduction of $B^0$, $B^+$, and $B_s^0$ mesons at leading order in the parton Reggeization approach using the universal fragmentation functions extracted from the combined $e^+e^-$ annihilation data from CERN LEP1 and SLAC SLC colliders. We have described $B$-meson transverse momentum distributions measured in the central region of rapidity by the CDF Collaboration at Fermilab Tevatron and CMS Collaboration at LHC within uncertainties and without free parameters, applying Kimber-Martin-Ryskin unintegrated gluon distribution function in a proton. The forward $B$-meso…
Application of the effective action formalism is studied for processes in which the reggeons may split. It is shown that the gluon production on two centers is described by the contribution of the Reggeon-to-two-Reggeons-plus-Particle vertex supplemented by certain singular contributions from the double gluon exchange. The rules for longitudinal integrations are established from the comparison to perturbative QCD amplitude. Convenient expressions for application to the inclusive gluon production are derived.
Tests of the parametrizations of Fragmentation Functions using data on inclusive pion and kaon production in unpolarized $pp$ collisions from the STAR collaboration and at the NICA project
本研究在NLO pQCD框架下检验了多种π和K介子碎裂函数与STAR数据的符合程度，发现LSS-15、DSEHS-14和DSEHS-17表现最佳，并指出在NICA低能标下需考虑初态软胶子辐射高阶效应。
On the inclusive gluon jet production off the nucleus in the perturbative QCD
在微扰QCD方法中，从相应的正则化胶子图出发，研究了胶子产生的单、双包含截面。发现了对应于三重Pomeron顶点胶子发射的各种项，其中Kovchegov和Tuchin导出的项是从衍射顶点到有效高能顶点跃迁的结果。然而，它并没有穷尽所有顶点对包含截面的贡献。在双包含截面中发现了一个违反朴素AGK规则的贡献，其中一个胶子从顶点发射，另一个胶子从顶点以下的一个坡密子发射。但是，这种贡献在高能量下是次显性的，考虑它似乎是值得怀疑的。
QCD-Gravity double-copy in the Regge regime: shock wave propagators
本研究在超相对论核碰撞胶子辐射与超普朗克引力冲击波引力子辐射的双重拷贝关系基础上，计算广义相对论下引力冲击波传播子，验证其与胶子传播子的双重拷贝关系，为黑洞遭遇高频辐射谱计算提供关键输入。
To obtain more precise parton distribution functions (PDFs) it is important to include data on inclusive high transverse energy jet production in the global parton analyses. These data have high statistics and the NNLO terms in the perturbative QCD (pQCD) description are now available. Our aim is to reduce the uncertainty in the comparison of the jet data with pQCD. To ensure the best convergence of the pQCD series it is important to choose the appropriate factorization scales, $μ_F$. We show that it is possible to absorb and resum in the incoming PDFs and fragmentation function ($D$) an essen…
NLO jet production in k_T factorization
本文在次领先阶kT分解（next-to-leading order，NLO）的背景下讨论了中心快度区喷流的包容产生。利用NLO BFKL结果在Regge限值中进行计算。我们引入了喷流锥的定义，并进行了适当的相空间分离到多Regge和准多Regge运动区域。我们讨论两种情况：高度虚光子的散射，这需要一个对称的能量尺度来分离胶子格林函数的影响因子，以及强子-强子碰撞，其中需要一个非对称的尺度选择。
We revisit the evaluation of the pionic mechanism of the $\bar{u}-\bar{d}$-asymmetry in the proton structure function. Our analysis is based on the extended AGK unitarity relation between contributions of different mechanisms to the inclusive particle production and the total photoabsorption cross-section (i.e. the proton structure function). We reanalyze the role of isovector reggeons in inclusive production of nucleons and Delta isobars in hadronic reactions. We find rather large contribution of reggeon-exchange induced production of Delta isobars. This leaves much less room for the pion-exc…
NLO jet production at central rapidities in $k_T$ factorization
在这篇文章中，我们讨论了在$k_T$ -因式分解的情况下，在下一个领先的顺序（NLO）的快速中心区域的射流的包容性生产。我们在QCD的Regge极限下工作，并使用NLO BFKL结果。提出了射流锥的定义，并将相空间分离为多Regge运动学和准多Regge运动学。我们讨论了高虚光子的散射，用对称的能量尺度将影响因子与胶子格林函数分开，以及强子-强子碰撞，用非对称的尺度选择。
Gluon production on two scattering centers is studied in the formalism of reggeized gluons. Different contributions to the inclusive cross-section are derived with the help of the Lipatov effective action. The AGK relations between these contributions are established. The found inclusive cross-section is compared to the one in the dipole picture and demonstrated to be the same.
We discuss the interplay of low-x physics and QCD scaling violations by extending the unified approach describing inclusive structure functions and diffractive production in $γ* p$ interactions proposed in previous papers, to large values of Q2. We describe the procedure of extracting, from the non-perturbative model, initial conditions for the QCD evolution that respect unitarity. Assuming Regge factorization of the diffractive structure function, a similar procedure is proposed for the calculation of hard diffraction. The results are in good agreement with experimental data on the proton str…
The Process gamma* + p -> eta_c + X: A Test for the Perturbative QCD Odderon
在三重Regge区计算了eta_c介子：gamma* + p -> eta_c + X的光生和电生速率，并对衍射质量X积分.对于Regge交换，我们使用硬Pomeron和Odderon，两者都是在微扰QCD的框架下计算的。积分截面取决于BFKL坡密子与两个$C=-1$奇子的耦合，光生的积分截面为60 pb，在Q ^2 =25 GeV ^2时为1.5 pb。
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