Threshold Resummation in B --> X_c l nu_l Decays
Ugo Aglietti, Leonardo Di Giustino, Giancarlo Ferrera, Alessandro Renzaglia, Giulia Ricciardi, Luca Trentadue
我们计算了B → X_c + l + nu_l衰变到次领先对数近似下的QCD形状因子的计算阈值。我们提出了一个插值公式，包括软以及共线效果软化的非零魅力质量。
We compute the QCD form factor resumming threshold logarithms in B --> X_c + l + nu_l decays to next-to-leading logarithmic approximation. We present an interpolation formula including soft as well as collinear effects softened by the non-vanishing charm mass.
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Effects of threshold resummation
定量研究了Mellin空间中对数修正$\ln N$的阈值重定效应。在大喷流横向能量下，阈值修正导致次领先阶QCD对喷流产生的预测增强，这与实验数据所显示的趋势一致。我们表明，这种增强是完全由阈值重定在小$N$的行为，该区域的层次之间的不同权力的$\ln N$丢失，目前的下一个领先的对数重定是不可靠的。我们的分析表明，更准确的阈值重申形式主义，应发展，以获得令人信服的预测。
Unification of the $k_T$ and threshold resummations
我们导出了一个依赖于$k_T$的部分子分布函数在阈值处的重算公式，其中$k_T$是一个部分子横动量。推导过程要求在柯林斯-索珀再确认框架下计算软胶子发射时，需要考虑纵圈动量和横圈动量的红外截止值。这种统一的再确认在大的$b$下表现出抑制，$b$是$k_T$的共轭变量，这与$k_T$再确认类似，并且在小的$b$下表现出增强，这与阈值再确认类似。
$k_T$ and threshold resummations
我们证明，无论是$k_T$和阈值计算可以在柯林斯-Soper计算形式主义通过评估软胶子发射与红外截止的纵向和横向圈动量，分别进行。部分子分布函数的$k_T$重定导致大$b$区域的抑制，$b$是部分子横向动量$k_T$的共轭变量，而阈值重定导致大$N$极限的增强，$N$是分布函数的矩，这是双对数演化方向相反的结果。高能末态喷流的$k_T$和阈值修正给出了抑制。阈值再确认从增强到抑制的切换归因于非零射流不变质量。在同一框架下，我们推导出统一的$k_T$和阈值计算的部分子分布函数，通过要求红外截止的纵向和横向回路动量。这种统一的再膨胀在大$b$下表现出抑制，类似于$k_T$再膨胀，并且在小$b$下表现出增强，类似于阈值再膨胀。
Threshold Resummation for QCD Hard Scattering
我们描述了重夸克产生中部分子阈值处奇异分布的再确认，推广了Drell-Yan和其他电弱硬散射过程的结果。
Threshold Resummation and Rapidity Dependence
以瞬发光子截面为例，研究了阈值重算对包含单粒子的截面的快度依赖性的影响。我们利用全重算公式在次领先的对数精度，并开发了一种新的技术，用于处理快速重算。我们比较了我们的现象学结果与以前的研究，并讨论了现有的两个重申形式主义的差异和相似之处。
Refining threshold resummations
我们描述了一些最新的改进技术的阈值remation，重点是有用的尺寸正则化时，适用于nonabel指数。对于DIS和电弱湮灭截面，阈值重算现在处于理论控制之下，一直到第四塔的重算，直到由阈值变量的幂抑制的校正。
Combined recoil and threshold resummation for hard scattering cross sections
讨论了软辐射对部分子截面的阈值和反冲增强的同时再确认。我们的方法是基于重构的部分子截面附近的部分子阈值。它避免了重复计算，保存了部分子能量的流动，并在忽略其他增强的情况下再现了阈值或反冲的再激发。
We show that the conventional threshold resummation calculation cannot describe well the low energy Drell-Yan (DY) data without including the non-perturbative correction terms which are deduced from analyzing the asymptotic behavior of the resummation formalism. It is demonstrated that the non-perturbative correction is generally small for the large invariant mass DY pairs produced at the Tevatron and the LHC.
Threshold resummation for double-deeply virtual Compton scattering
本文针对双重深度虚康普顿散射的阈值区域，在味道非单态情形下利用（重）因子化定理推导了部分子阈值对数的重求和公式，并得到与显式计算一致的双圈系数函数领头项，实现了非平凡交叉检验。
Threshold resummation $S$-factor in QCD: the case of unequal masses
在量子色动力学中，得到了新的相对论类库仑阈值重算因子$S$。考虑的框架内的准势方法的量子场论，制定在相对论性的配置表示为两个粒子的质量不等。
Resummation for Heavy Quark Production Near Partonic Threshold
本文综述了在强子散射和部分子阈附近的电产生中重夸克产生的重化技术，并讨论了重化截面中因子化标度依赖性的降低。
Crossed Threshold Resummation
我们表明，某些一般性质的阈值和联合的Drell-Yan截面的假设，以及它们的交叉类似物在半包容的深度非弹性散射和双包容轻子湮灭。我们发现，所有的加分布校正阈值附近显示相同的结构，并确定所有对数阶由两个异常的尺寸，其中之一是一个推广的D-项先前在Drell-Yan。我们还讨论了普遍性的可能性，在权力的修正所暗示的重申。
Threshold Resummation Effects in the polarized Drell-Yan process at GSI and J-PARC
本文研究了横向极化pp和\bar{p} p散射中双轻子产生的QCD修正。特别地，我们简要地讨论了NNLL阈值重定对轻子对快度分布的影响。
Threshold resummation for high-transverse-momentum Higgs production at the LHC
本文研究了当希格斯玻色子H在高横动量下产生时，对过程pp ->H+ X的大对数QCD修正的重新确认.这些修正产生于部分子反应的阈值附近，并来源于软胶子辐射。我们执行的所有顺序remation在下一个领先的对数精度和匹配的结果与下一个领先的顺序微扰预测。本文讨论了在LHC中重校准对Higgs横动量分布的影响。
Threshold resummation for gluon fusion $ZH$ production at the LHC
本文通过QCD框架内的阈值重求和方法，提高了LHC上ZH生产截面和不变量质量分布的计算精度。
Resummation of Threshold Corrections for Single-Particle Inclusive Cross Sections
我们推导出单粒子和单射流包容性截面的阈值方程，从而将以前的结果在固定不变质量下推广到更广泛的一类具有唯象意义的截面。我们通过与直接光子和重夸克的显式单圈计算的比较，确认了我们的图解表达式的结构。
We demonstrate that theoretical predictions using current resummation techniques for the lepton pair production (LPP) rapidity and $x_F$ distributions can be inconsistent with data in high rapidity and $x_F$ kinematic regions by observing their effect in global fits of parton distribution functions (PDFs). We present an enhanced resummation technique for the LPP rapidity and $x_F$ distributions that agrees with LPP data. The enhanced resummation method is used in conjunction with threshold resummation in deep inelastic scattering (DIS) to perform two global fits of PDFs using the minimal and B…
We present a phenomenological study of Drell-Yan pair production at hadron colliders based on the NNLO fixed order calculation and on NNLL resummation of threshold logarithms. We give an argument to prove that resummation effects are relevant also for values of x=M^2/s far from threshold. We compare different prescriptions for the calculation of resummed quantities, emphasizing the differences coming from subleading terms, which are important when x is small. We present phenomenological predictions for Drell-Yan rapidity distributions at the LHC, we study the ambiguity related to the resummati…
Approximate NNLO Threshold Resummation in Heavy Flavour Decays
我们提出了一个近似的NNLO评估QCD形状因子表示大对数微扰的贡献，在半包含重味衰变。
We present a combined resummation for the transverse momentum distribution of a colorless final state in perturbative QCD, expressed as a function of transverse momentum pt and the scaling variable x. Its expression satisfies three requirements: it reduces to standard transverse momentum resummation to any desired logarithmic order in the limit pt-> 0 for fixed x, up to power suppressed corrections in pt; it reduces to threshold resummation to any desired logarithmic order in the limit x-> 1 for fixed pt, up to power suppressed correction in 1-x; upon integration over transverse momentum it re…
We study the power corrections for electroweak boson production that are implied by threshold resummation, which we have extended to massive particles produced at measured transverse momentum, $p_T$, and rapidity. Power corrections in the resulting expressions arise from ambiguities in the low-scale behavior of the perturbative running coupling. Arguing for the relevance of the eikonal approximation, we show that such power corrections begin at order $1/p_T^2$ in full QCD, consistent with fixed-order, massive-gluon analysis. For large-$N$ Mellin moments, the leading behavior is $N^2/p_T^2$, wh…
We extend the threshold resummation of the large logarithms $\ln x$ which appear in factorization formulas for exclusive $B$ meson decays, $x$ being a spectator momentum fraction, to the next-to-leading-logarithm (NLL) accuracy. It is shown that the NLL resummation effect provides suppression in the end-point region with $x\sim 0$ stronger than the leading-logarithm (LL) one, and thus improves perturbative analyses of the above processes. We revisit the $B\to Kπ$ decays under the NLL resummation, and find that it induces 20-25\% variation of the direct CP asymmetries compared to those from the…
I derive an all-order resummation formula for the logarithmically enhanced contributions proportional to $\frac{α_s^n}{x \pm ξ} \log (\frac{ξ\pm x}{2ξ})^k$ in the quark coefficient function of deeply-virtual-Compton scattering and the pion-photon transition form factor in momentum space. The resummation is performed at the next-to-next-to-leading logarithmic accuracy. The key observation is that the quark coefficient function itself factorizes in the $x \rightarrow \pm ξ$ limit, which allows for a resummation using renormalization group equations. A preliminary numerical analysis suggests that…
Leptoquark Pair Production in γγScattering: Threshold Resummation
讨论了在光子-光子碰撞中成对产生细夸克的可能性。QCD阈值修正导致产生截面的强烈增强。适当长寿命的轻夸克（$Γ_Φ\lsim 100 \MeV$）可以形成轻夸克偶素态。
We present precision calculations of the invariant-mass and transverse-momentum distributions of gaugino pairs produced at hadron colliders. We implement the threshold and transverse-momentum resummation formalisms at next-to-leading order accuracy and match the obtained result to the perturbative prediction at O(alpha_s). We compare the various resummed cross sections with the perturbative results and Monte Carlo predictions. The theoretical uncertainties coming from renormalisation and factorisation scale variations are also discussed.
Threshold Resummation in Semi-Inclusive B decays
本文讨论了辐射和无粲半轻子B衰变的阈重算。为了处理大的非微扰效应，我们引入了一个基于解析QCD耦合的NNLL图形化形状因子模型。用这个模型可以很好地再现实验数据。最后，我们简要地提出了一个改进的阈值计算公式来处理半轻子粲衰变中由大质量夸克引发的喷注。
The QCD predictions for single-inclusive jet production are computed with joint resummation of threshold and jet radius logarithms. The results are compared to those based on fixed order perturbation theory up to next-to-next-to-leading order and to data by the CMS collaboration measured in proton-proton collisions at the LHC at $\sqrt{S}=8$ TeV. The joint resummation results are in remarkable agreement with the data.
Threshold Resummation for the Inclusive-Hadron Cross-Section in pp Collisions
本文研究了强子h的高横动量下pp->h X过程的部分子截面的大对数微扰修正的重新表示。这些修正出现在部分子反应的阈值附近，并与软胶子发射有关。我们执行重算以达到仅次于领先的对数精度。我们提出了固定目标制度的数值结果，并发现增强下一个领先的顺序截面，这显着提高了理论预测和数据之间的协议。我们也适用于RHIC运动学的重新表述，并发现subleading条款似乎在这里发挥了相当重要的作用。
Threshold resummation for $ZZ$ production
本文回顾了Standard Model中两个大质量$Z$玻色子的阈值重和研究现状，并讨论了在NNLO+NNLL精度下$Z$玻色子对产生的最新结果。
Threshold resummation for the prompt-photon cross section revisited
本文研究了在光子的高横动量下，对pp-> gamma X过程的部分子截面的大对数微扰修正的再确认，这些修正出现在部分子反应的阈值附近，并与软胶子发射有关。我们特别关注的是，在射流碎裂过程中，光子产生的截面的贡献，是由于再膨胀效应。在固定阶微扰理论中，以前的计算已经确定这种贡献是截面的次主导部分。然而，我们发现，它是受到更大的再确认效果比直接（非碎裂）一块，因此似乎是一个显着的贡献，在固定目标制度，没有太多的抑制相对于直接的一部分。包括阈值重建的碎片导致一些改进的理论计算和实验数据之间的比较。
We perform a systematic comparison of soft-gluon resummation in SCET and in a standard "direct" QCD (dQCD) approach, both from an analytical and a phenomenological point of view. In particular, we concentrate on Higgs boson production in gluon-gluon fusion at a hadron collider. Using specifically a saddle point argument, we arrive at a detailed understanding of the quantitative differences between these two approaches.
Threshold Resummation for W-Boson Production at RHIC
在BNL相对论重离子对撞机（RHIC）上，研究了pp -> W^+- X过程部分子截面的大对数微扰修正的重新计算。在RHIC，极化质子是可用的，这一过程的自旋不对称性将用于精确测量质子中的上下夸克和反夸克分布。修正出现在部分子反应的阈值附近，并与软胶子发射有关。对于快速微分截面，我们进行了重新计算，以达到仅次于领先的对数精度。我们发现，再结晶导致相对温和的截面和自旋不对称性的影响。
The precise knowledge of parton distribution functions (PDFs) is indispensable to the accurate calculation of hadron-initiated QCD hard scattering observables. Much of our information on PDFs is extracted by comparing deep inelastic scattering (DIS) and lepton pair production (LPP) data to convolutions of the PDFs with the partonic cross sections of these processes. It is known that partonic cross sections receive large corrections in regions of phase space near partonic thresholds that can be resummed using threshold resummation techniques. The effect of threshold resummation on DIS and LPP d…
We explore the effects of the resummation of large logarithmic perturbative corrections to double-longitudinal spin asymmetries for inclusive and semi-inclusive deep inelastic scattering in fixed-target experiments. We find that the asymmetries are overall rather robust with respect to the inclusion of the resummed higher-order terms. Significant effects are observed at fairly high values of x, where resummation tends to decrease the spin asymmetries. This effect turns out to be more pronounced for semi-inclusive scattering. We also investigate the potential impact of resummation on the extrac…
Threshold resummation of Drell-Yan rapidity distributions
本文推导了Drell-Yan快度分布的阈值重算公式。我们的论证对所有快度值和微扰QCD中的所有阶数都有效，并且可以以普遍的方式应用于所有Drell-Yan过程，即既适用于虚光子γ^{*}的产生，也适用于矢量玻色子W^{ \pm }，Z^{0}的产生。我们表明，对于固定目标实验E866/NuSea在目前的部分子拟合，NLL重校准校正是可比的NLO固定阶校正，是至关重要的，以获得与数据的协议。
Threshold Resummation of Soft Gluons in Hadronic Reactions -- An Introduction
我讨论的动机重申的初始状态软胶子辐射的影响，在强耦合强度的所有订单，在其中的近阈值区域的部分子能量是重要的过程。总结了“微扰重算”方法及其在强子对撞机顶夸克产生总截面计算中的应用。评论包括在这种方法和其他方法中的子领导对数项的治疗之间的差异。
We investigate the QCD effects in the production of neutral Higgs bosons via bottom quark fusion in both the standard model and the minimal supersymmetric standard model at the CERN Large Hadron Collider. We include the next-to-leading order (NLO) QCD corrections (including supersymmetric QCD) and the threshold resummation effects. We use the soft-collinear effective theory to resum the large logarithms near threshold from soft gluon emission. Our results show that the resummation effects can enhance the total cross sections by about 5% compared with the NLO results.
We parameterize the enhancement of threshold effects away from hadronic endpoint that arise due to the steeply falling nature of parton distribution functions, within the context of soft-collinear effective theory. This is accomplished in a process-independent way by directly linking the charac- teristic scale of soft and collinear radiation, λ, to the shape of the pdfs. This allows us quantify the power corrections to partonic threshold resummation as a function of the invariant mass and rapidity of the final state. In the context of SCET, being able to compute λin a process-independent manne…
We explore similarities and differences between widely-used threshold resummation formalisms, employing electroweak boson production as an instructive example. Resummations based on both full QCD and soft-collinear effective theory (SCET) share common underlying factorizations and resulting evolution equations. The formalisms differ primarily in their choices of boundary conditions for evolution, in moment space for many treatments based on full QCD, and in momentum space for treatments based on soft-collinear effective theory. At the level of factorized hadronic cross sections, these choices …
We perform the threshold resummation for WZ and ZZ pair production at the next-to-next-to-leading logarithmic accuracy in Soft-Collinear Effective Theory at the LHC. Our results show that the resummation effects increase the total cross sections by about 7% for ZZ production and 12% for WZ production with$\sqrt{S}= 7,~8,~13 and 14 TeV, respectively, and the scale uncertainties are significantly reduced. Besides, our numerical results are well consistent with experimental data reported by the ATLAS and CMS collaborations.
Threshold resummation for electroweak annihilation from DIS data
我们表明，高阶系数需要执行阈值remmation的电弱湮灭过程，如Drell-Yan或希格斯生产通过胶子融合，可以计算使用微扰的结果来自深非弹性散射。作为一个例子，我们计算三圈系数D_3，产生的大部分的第四塔的阈值谱的Drell-Yan截面的MSbar计划，使用最近的三圈分裂函数和夸克形状因子的结果，以及一类指数的双圈贡献的Drell-Yan过程。
We consider the resummation of soft and Coulomb gluons for pair-production processes of heavy coloured particles at hadron colliders, and discuss recent results on the construction of a basis in colour space that diagonalizes the soft function to all orders in perturbation theory and the determination of the two-loop soft anomalous dimension needed for NNLL resummations. We present results for the combined NLL resummation of soft gluon and Coulomb-gluon effects for squark-antisquark production at the LHC.
Threshold Resummation for Drell-Yan Process in Soft-Collinear Effective Theory
我们考虑了在软胶子辐射导致的阈值区$z\to 1$中的Drell-Yan过程。我们提出了一种软共线有效理论方法来重新求和这些Sudakov型方程，其结果与先前通过微扰QCD因子化得到的结果一致
Threshold Resummation Effects in the Associated Production of Chargino and Neutralino at Hadron Colliders
我们研究了在费米实验室Tevatron和CERN大型强子对撞机（LHC）上最小超对称标准模型（MSSM）中电荷伴子和中性伴子$\tildeχ^\pm_{1}$和$\tildeχ^0_{2}$的伴随产生中的QCD效应.我们考虑了次领先阶（NLO）QCD修正（包括超对称QCD）和阈值重算效应。我们的结果表明，与非线性光学预测相比，阈值再确认效应可以使LHC上$\tildeχ^+_{1}\tildeχ^0_{2}$和$\tildeχ^-_{1}\tildeχ^0_{2}$的总截面分别增加3.6%和3.9%，而Tevatron上$\tildeχ^\pm_{1}\tildeχ^0_{2}$的总截面增加4.7%。在不变质量分布中，当不变质量较大时，重算效应显著。阈值重算将LHC（Tevatron）的总截面对重整化/因式分解尺度的依赖性从NLO的7%（11%）降低到5%（4%）。
Transverse-momentum, threshold and joint resummations for slepton pair production at hadron colliders
本文对强子对撞机上产生的slepton对的横动量谱和不变质量分布进行了精确计算。我们实现的横向动量，阈值和联合重申形式主义在次领先的对数精度，并始终匹配所获得的结果与纯微扰结果在一阶强耦合常数，即在顺序alpha_s。我们给出了选择子和Stau对产生的数值预测，并将各种计算的截面与微扰结果进行了比较。
Resummation of threshold double logarithms in hadroproduction of heavy quarkonium
针对重夸克偶素遍举产生中固定阶微扰理论因大辐射修正导致大横动量截面可能为负的失效问题，通过重整化阈值双对数解决该问题，证实其对描述大横动量下$J/ψ$快产生速率的必要性。
Threshold Resummation for Slepton-Pair Production at Hadron Colliders
本文首次对强子对撞机上超对称粒子产生的阈重增效应进行了广泛的研究，重点研究了Drell-Yan类slepton-pair和slepton-sneutrino的产生.在确认了已知的次领先阶（NLO）QCD修正并将NLO SUSY-QCD修正推广到虚圈贡献中混合方的情况下，我们采用了通常的Mellin N空间重构形式，并通过对1/N抑制的和N独立的普适贡献的重构，改进了Mellin N空间重构形式。数值上，我们的研究结果增加了理论截面的5%至15%的非线性光学预测和稳定他们通过减少规模的依赖性从高达20%的非线性光学阈值remation小于10%。
Coulomb resummation for $b \bar b$ system near threshold and precision determination of $\al_s$ and $m_b$.
在非相对论库仑近似下，分析了具有阈值效应的$Υ$系统的求和规则。我们发现底夸克的极质量$m_b=4.75\pm 0.04 GeV$和强耦合常数$\al_s(M_Z)=0.118\pm 0.006$。澄清了在同一正式框架内获得的两个最近的估计之间的矛盾的起源。
We derive precision predictions for the production of dark-matter particles recoiling against a jet with large transverse momentum at the LHC. The dark-matter fermions are described within a simplified model and couple to the Standard Model via a vector mediator. Our predictions for the mono-jet signature include the resummation of the leading and next-to-leading threshold logarithms. The corresponding matching coefficient is evaluated at NLO. The resummed result is matched to the fixed-order NLO cross section obtained from the MadGraph framework. We discuss numerical results for several bench…
We study the cross section for the photoproduction process $γN\rightarrow h X$ where the incident photon and nucleon are longitudinally polarized and a hadron $h$ is observed at high transverse momentum. Specifically, we address the "direct" part of the cross section, for which the photon interacts in a pointlike way. For this contribution we perform an all-order resummation of logarithmic threshold corrections generated by soft or collinear gluon emission to next-to-leading logarithmic accuracy. We present phenomenological results relevant for the COMPASS experiment and compare to recent COMP…
Threshold Resummation and the Total Cross Section for Top Quark Production
我们讨论的动机重申的初始状态软胶子辐射的影响，在强耦合强度的所有订单，在其中的近阈值区域的部分子能量是重要的过程。总结了强子对撞机上顶夸克产生总截面的计算结果。评论包括我们的治疗subleading对数项和其他方法之间的差异。
We derive the threshold-resummed total cross section for heavy quark production in hadronic collisions accurate to next-to-next-to-leading logarithm, employing recent advances on soft anomalous dimension matrices for massive pair production in the relevant kinematic limit. We also derive the relation between heavy quark threshold resummations for fixed pair kinematics and the inclusive cross section. As a check of our results, we have verified that they reproduce all poles of the color-averaged q\bar{q} -> t\bar{t} amplitudes at two loops, noting that the latter are insensitive to the color-an…
We derive a general expression for the threshold resummation of transverse momentum distributions for processes with a colorless final state, by suitably generalizing the renormalization-group based approach to threshold resummation previously pursued by two of us. The ensuing expression holds to all logarithmic orders, and it can be used to extend available results in the literature, which only hold up to the next-to-leading log (NLL) level. We check agreement of our result with the existing NLL result, as well as against the known fixed next-to-leading order results for the Higgs transverse …
We advance the threshold resummation formalism for semi-inclusive deep-inelastic scattering (SIDIS) to next-to-next-to-next-to-leading logarithmic (N$^{3}$LL) order, including the three-loop hard factor. We expand the results in the strong coupling to obtain approximate next-to-next-to-next-to-leading order (N$^{3}$LO) corrections for the SIDIS cross section. In Mellin moment space, these corrections include all terms that are logarithmically enhanced at threshold, or that are constant. We also consider a set of corrections that are suppressed near threshold. Our numerical estimates show modes…
We derive a factorization formula for the production of pairs of heavy coloured particles in hadronic collisions near the production threshold that establishes factorization of soft and Coulomb effects. This forms the basis for a combined resummation of Coulomb and soft corrections, including the non-trivial interference of the two effects. We develop a resummation formalism valid at NNLL accuracy using the momentum-space approach to soft gluon resummation. We present numerical results for the NLL resummed squark-antisquark production cross section at the LHC and Tevatron, including also the c…
On next-to-eikonal corrections to threshold resummation for the Drell-Yan and DIS cross sections
研究了软胶子能量的一次方对Drell-Yan截面和Deep非弹性结构函数的阈能的修正。虽然没有一般的因式分解定理是已知的这些次程函（NE）的修正，它是明确的，至少有一个子集将指数，随着在领先的权力产生的矩阵。在这里，我们开发了一些通用的工具来研究NE的修正，我们构建了一个阈值修正，其中包括各种来源的NE修正，在这种情况下，实施改进的共线演化最近提出的Dokshitzer，Marchesini和萨拉姆（DMS）。我们比较我们的ananterior现有的确切结果在两个和三个循环，寻找证据的指数领先NE的numberms和确认DMS演化的预测性。
We investigate threshold resummation effects in the production of a color sextet (antitriplet) scalar at next-to-next-to-leading logarithmic (NNLL) order at the LHC in the frame of soft-collinear effective theory. We show the total cross section and the rapidity distribution with NLO+NNLL accuracy, and we compare them with the NLO results. Besides, we use recent dijet data at the LHC to give the constraints on the couplings between the colored scalars and quarks.
We study the resummation of large logarithmic perturbative corrections to the partonic cross sections relevant for di-hadron production in hadronic collisions, H1 H2 -> h1 h2 X, at high invariant mass of the produced hadron pair. These corrections arise near the threshold for the partonic reaction and are associated with soft-gluon emission. We perform the resummation to next-to-leading logarithmic accuracy, and show how to incorporate consistently cuts in rapidity and transverse momentum of the observed particles. We present numerical results for fixed-target and ISR regimes and find enhancem…
Threshold resummation of rapidity distributions at fixed partonic rapidity
本文研究了在部分子中心系框架中固定快速性分布的阈值重组合成，通过通用化之前的重整化群方法，推导出通用表达式，并通过Drell-Yan过程的NNLO结果确定重组合成系数至NNLL精度。
The Sommerfeld rescattering formula is compared to the e+e- -> ppbar BaBar data at threshold and above. While there is the expected Coulomb enhancement at threshold, two unexpected outcomes have been found: |G^p (4M_p^2)|= 1, like for a pointlike fermion, and moreover data show that the resummation factor in the Sommerfeld formula is not needed. Other e+e- -> baryon-antibaryon cross sections show a similar behavior near threshold.
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