We present a new program (iHixs) which computes the inclusive Higgs boson cross-section at hadron colliders. It incorporates QCD corrections through NNLO, real and virtual electroweak corrections, mixed QCD-electroweak corrections, quark-mass effects through NLO in QCD, and finite width effects for the Higgs boson and heavy quarks. iHixs can be used to obtain the most precise cross-section values in fixed order perturbation theory in the Standard Model. In addition, it allows for a consistent evaluation of the cross-section in modified Higgs boson sectors with anomalous Yukawa and electroweak interactions as required in extensions of the Standard Model. iHixs is interfaced with the LHAPDF library and can be used with all available NNLO sets of parton distribution functions.
Using the standard Balitsky-Fadin-Kuraev-Lipatov (BFKL) approach, with partial inclusion of next-to-leading order effects, we propose the inclusive hadroproduction of a Higgs boson and of a jet, featuring large transverse momenta and well separated in rapidity, as a new channel to probe the BFKL dynamics. Predictions are presented for cross-sections and azimuthal angle correlations in different kinematics configurations for the final-state transverse momenta. We find that the large energy scales provided by the emission of a Higgs boson stabilize the BFKL series.
We calculate the one-loop corrections to the soft anomalous dimension matrices for the production of a top-antitop quark pair in association with a jet at hadron colliders. This is a step forward towards implementing a procedure for the resummation of soft-gluon emission logarithms for the $t\bar{t}j + X$ hadroproduction process, that will enable the improvement of the accuracy of the $t\bar{t} j + X$ cross sections, beyond the current degree of knowledge. The latter, so far, has reached the next-to-leading order (NLO) level, complemented by the accuracy of the Shower Monte Carlo approaches us…
Threshold Resummation for Top-Pair Hadroproduction to Next-to-Next-to-Leading Log
利用最近关于运动学极限下大质量夸克偶产生的软反常维数矩阵的研究进展,我们导出了强子碰撞中重夸克产生的阈值化总截面,精确到次领先对数。我们还导出了固定对运动学的重夸克阈近似与包含截面之间的关系。作为我们的结果的检查,我们已经验证了,他们再现的所有极点的颜色平均q \bar{q} -> t \bar{t}振幅在两个循环,注意到后者是不敏感的软异常尺寸的颜色反对称项。
Probing anomalous Higgs couplings in $H \to Z V$ decays
本文分析了在稀有衰变$H \to Z V$中探测反常Higgs耦合的可能性,其中$V$是一种矢量夸克偶素态.这些罕见的衰变涉及规范以及汤川部门,他们中的任何一个都可能是异常的。我们发现标准模型中$H \to Z V$衰变的分支分数很小,这使得它成为一个灵敏的探针,用于研究源于标准模型之外的物理现象的异常希格斯耦合。此外,由于$V$和$Z$都可以衰变成带电轻子对,它们提供了实验上干净的通道,未来的LHC运行应该会观察到这样的衰变。我们进行了一个独立的模型分析,并显示如何角不对称性可以用来探测这些异常的希格斯耦合,考虑到进一步衰变的$V$和$Z$对带电轻子。角不对称性可以提供重要的信息异常希格斯耦合在规范和汤川部门。
Intrinsic Charm Contribution to Double Quarkonium Hadroproduction
双$J/ψ$生产已被观察到的NA 3合作的$πN$和$p N$碰撞的横截面的数量级为20-30 pb。在150和280 GeV $/c$的$π^- $核相互作用中测量的$ψψ$对在实验室框架中被观察到携带非常大比例的抛射体动量,$x_{ψψ} \geq 0.6$在150 GeV $/c$和$\geq 0.4$在280 GeV $/c$。我们假设这些正向$ψψ$对是由包含两对内禀$c \overline c$夸克的抛射体中的Fock态物质化产生的。我们计算了粲偶素态与$|\overline u d c \overline c c \overline c \rangle$ Fock态的重叠,发现$π^- N \rightarrow ψψ$的纵动量分布和不变质量分布都很好地再现了。我们还讨论了$pN$相互作用中的双$J/ψ$产生以及对QCD中其他重夸克偶素产生通道的影响。
We calculate the next-to-leading order correction to the impact factor (vertex) for the production of a forward Higgs boson, obtained in the infinite top-mass limit. We present the result both in the momentum representation and as superposition of the eigenfunctions of the leading-order BFKL kernel. This impact factor is a necessary ingredient for the description of the inclusive hadroproduction of a forward Higgs in the limit of small Bjorken $x$, as well as for the study of inclusive forward emissions of a Higgs boson in association with a backward identified object.
Can the Two-Higgs-Doublet Model Survive the Constraint from the Muon Anomalous Magnetic Moment as Suggested?
需要两个希格斯偶极子模型II,以适应3 $σ$偏差的μ子异常磁矩希格斯谱施加特定的限制。我们分析了模型参数空间上所有相关的、可用的约束的组合。从$b\to s γ$,精确的电弱测量的$R_b$,和$ρ$参数,连同排除在LEP直接搜索的约束条件的使用,给出了非常严格的限制模型参数。这“几乎足以”完全杀死该模型。如果直接搜索可以被优化以补充其他约束,则排除将更强,如将在本工作中详细讨论的。
The future Large Hadron Electron Collider (LHeC) would enable collisions of an intense electron beam with either protons or heavy ions at the High Luminosity-Large Hadron Collider (HL- LHC). With a center of mass energy greater than a TeV and a high luminosity, the LHeC would be a new-generation collider for deep-inelastic scattering (DIS) and a significant facility for precise Higgs physics, complementing pp and electron-positron colliders. Anomalous hadronic decay signatures of the Higgs Boson, such as those into three or more partons, are challenging to detect at the LHC due to high backgro…
We present a study of Higgs boson production in vector boson fusion and in association with a vector boson and its decay to two vector bosons, with a focus on the treatment of virtual loops and virtual photons. Our analysis is performed with the JHU generator framework. Comparisons are made to several other frameworks, and the results are expressed in terms of an effective field theory. New features of this study include a proposal on how to handle singularities involving Higgs boson decays to light fermions via photons, calculation of the partial Higgs boson width in the presence of anomalous…
The inclusive hadroproduction of a Higgs boson and of a jet, featuring large transverse momenta and well separated in rapidity, is proposed as a novel probe channel for the manifestation of the Balitsky-Fadin-Kuraev-Lipatov (BFKL) dynamics. Using the standard BFKL approach, with partial inclusion of next-to-leading order effects, predictions are presented for azimuthal Higgs-jet correlations and other observables, to be possibly compared with experimental analyses at the LHC and with theoretical predictions obtained in different schemes.
We combine the NNLO QCD description of Higgs boson production in association with an electroweak vector boson $V = W~{\rm or}~Z$ with a similarly-precise description of Higgs boson decays into a pair of massive $b$ quarks and with the anomalous couplings that modify interactions of the Higgs and electroweak vector bosons. The resulting numerical code provides the most advanced theoretical tool to investigate such anomalous couplings in the associated Higgs boson production process. We study the impact of anomalous couplings on fiducial cross sections and differential distributions and argue th…