Hye-Sung Lee
A new Abelian gauge symmetry U(1)' is well motivated to extend the standard model or supersymmetric standard model. Leptonic Z' resonances are clean signals even at the hadron colliders. We discuss how 4-lepton and 6-lepton Z' resonances can help the search for Supersymmetry and Higgs, respectively, at the LHC.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
继续探索
Composite Higgs models generically predict the existence of heavy spin-1 resonances with the same quantum numbers as electroweak gauge bosons. The effective lagrangian description of these resonances is presented, pointing out the origin of their interactions with SM matter fields and the resulting LHC phenomenology. Search strategies for spin-1 resonances are discussed, mentioning possible advantages offered by boosted decay products. The impact of interactions between spin-1 resonances and fermion resonances, crucial for the proper interpretation of LHC searches, is pointed out.
Dileptons and four leptons at Z' resonance in the early stage of the LHC
LHC时代才刚刚开始。LHC实验的第一个发现可以说是TeV级的新共振极，如果它存在的话。虽然Z'的发现本身就令人兴奋，但它也可能表明在LHC实验仍处于早期阶段时应该寻找其他新的物理信号。我们认为，Z'极的四轻子共振是一个很有意义的信号，特别是在超对称性框架下，它甚至可以作为LHC实验早期的超对称性搜索方案。
Search for new heavy resonances at the LHC
在这篇文章中，我们进行了分析的LHC潜力，寻找新的双μ子共振态从扩展规范模型和Randall-Sundrum方案的TeV规模的重力。
A model for exclusive diffractive resonance production in proton-proton collisions at LHC energies is presented. This model is based on the convolution of the Donnachie-Landshoff parameterisation of Pomeron flux in the proton with the Pomeron cross section for resonance production. The hadronic cross section for f$_{0}$(980) and f$_{2}$(1270) production at midrapidity is given differentially in mass and transverse momentum of the resonance. The proton fractional longitudinal momentum loss is presented.
Resonance Production of Three Neutral Supersymmetric Higgs Bosons at LHC
在未来的高能对撞机上，多重产生希格斯粒子对于研究希格斯粒子的自耦合是必不可少的。本文计算了LHC胶子聚变中三个最轻的中性超对称希格斯玻色子玻色子产生的共振贡献。三线性希格斯耦合的截面是相当大的，但四次耦合的测量似乎是不可能的。
A model for Pomeron-Pomeron total cross section in the resonance region $\sqrt{M^{2}} \le$ 5 GeV is presented. This model is based on Regge poles from the Pomeron and two different $f$ trajectories, and includes the isolated f$_{0}(500)$ resonance in the region $\sqrt{M^{2}}\lesssim 1$ GeV. A slowly varying background is included. The presented Pomeron-Pomeron cross section is not directly measurable, but is an essential ingredient for calculating exclusive resonance production at the LHC.
We study the constraints implied by partial wave unitarity on new physics in the form of spin-zero di-boson resonances at LHC. We derive the scale where the effective description in terms of the SM supplemented by a single resonance is expected to break down depending on the resonance mass and signal cross-section. Likewise, we use unitarity arguments in order to set perturbativity bounds on renormalizable UV completions of the effective description. We finally discuss under which conditions scalar di-boson resonance signals can be accommodated within weakly-coupled models.
Composite Higgs models predict the existence of resonances. We study in detail the collider phenomenology of both the vector and fermionic resonances, including the possibility of both of them being light and within the reach of the LHC. We present current constraints from di-boson, di-lepton resonance searches and top partner pair searches on a set of simplified benchmark models based on the minimal coset $SO(5)/SO(4)$, and make projections for the reach of the HL-LHC. We find that the cascade decay channels for the vector resonances into top partners, or vice versa, can play an important rol…
Resonance searches generally focus on narrow states that would produce a sharp peak rising over background. Early LHC running will, however, be sensitive primarily to broad resonances. In this paper we demonstrate that statistical methods should suffice to find broad resonances and distinguish them from both background and contact interactions over a large range of previously unexplored parameter space. We furthermore introduce an angular measure we call ellipticity, which measures how forward (or backward) the muon is in eta, and allows for discrimination between models with different parity …
If the di-photon excess at 750 GeV hinted by the 2015 data at the LHC is explained in terms of a scalar resonance participating in the breaking of the electro-weak symmetry, this resonance must be accompanied by other scalar states for perturbative unitarity in vector boson scattering to be preserved. The simplest set-up consistent with perturbative unitarity and with the data of the di-photon excess is the Georgi-Machacek model.
Recently reported diboson excesses at LHC are interpreted to be connected with heavy $WW$ resonance with weak isotopic spin 2. The resonance appears due to the wouldbe anomalous triple interaction of the weak bosons, which is defined by well-known coupling constant $λ$. We obtain estimates for the effect, which qualitatively agree with ATLAS data. Effects are predicted in inclusive production of $W^+W^+, W^+ (Z,γ), W^+ W^-, (Z,γ) (Z,γ), W^- (Z,γ), W^-W^-$ resonances with $M_R \simeq 2\,TeV$, which could be reliably checked at the upgraded LHC with $\sqrt{s}\,=\,13 TeV$. In the framework of an …
In composite Higgs models (CHMs), electroweak precision data generically push colourless composite vector resonances to a regime where they dominantly decay into pairs of light top partners. This greatly attenuates their traces in canonical collider searches, tailored for narrow resonances promptly decaying into Standard Model final states. By reinterpreting the CMS same-sign dilepton (SS2$\ell$) analysis at the Large Hadron Collider (LHC), originally designed to search for top partners with electric charge $5/3$, we demonstrate its significant coverage over this kinematical regime. We also sh…
Distinguishing Kaluza-Klein Resonances From a $Z'$ in Drell-Yan Processes at the LHC
我们探讨的能力的LHC区分卡鲁扎-克莱因（KK）激发的Drell-Yan碰撞从一个普通的$Z'$在LHC的情况下，额外的维度与费米子本地化的orbifold不动点的生产。特别是，我们证明了这种能力是依赖于质量的KK状态，以及是否夸克和轻子位于相同的固定点。
We conjecture that a 125 GeV resonance $ζ^0$ with $J^{PC}=0^{-+}$ composed of a quark-antiquark state may have been observed at the LHC. The decay modes of this pseudoscalar particle are determined using the non-relativistic quark model. The leading order partial decay widths for the decays of the pseudoscalar quarkonium resonance $ζ^0\rightarrow γγ$ and $ζ^0\rightarrow gg$ are compared to the standard model Higgs particle decays $H^0\rightarrow γγ$ and $H^0\rightarrow gg$. An experimental analysis at the LHC of the observed production cross sections for the $ζ^0$ and the Higgs particle could …
We present the implementation of an effective lagrangian via FeynRules, featuring bosons X(J^P) with various assignments of spin/parity J^P = 0^+, 0^-, 1^+, 1^-, or 2^+, that allows one to perform characterisation studies of the boson recently discovered at the LHC, for all the relevant channels and in a consistent, systematic and accurate way.
The mechanism of electroweak symmetry breaking (EWSB) will be directly scrutinized soon at the CERN Large Hadron Collider (LHC). We analyze the LHC potential to look for new vector bosons associated with the EWSB sector. We present a possible model independent approach to search for these new spin--1 resonances. We show that the analyses of the processes pp --> l^+ l^- Emiss_T, l^\pm j j Emiss_T, l^\pm l^+ l^- Emiss_T, and l^+ l^- j j (with l=e or μand j=jet) have a large reach at the LHC and can lead to the discovery or exclusion of many EWSB scenarios such as Higgsless models.
We consider a model where the electroweak symmetry breaking is driven by strong dynamics, resulting in an electroweak doublet scalar condensate, and transmitted to the standard model matter fields via another electroweak doublet scalar. At low energies the effective theory therefore shares features with a type-I two Higgs doublet model. However, important differences arise due to the rich composite spectrum expected to contain new vector resonances accessible at the LHC. We carry out a systematic analysis of the vector resonance signals at LHC and find that the model remains viable, but will b…
We discuss the possibility to observe new resonances at the early LHC using a phenomenological approach. We show predictions for the production of a scalar in the gg-channel and an heavy quark in the qg-channel and we compare them with the recent results of the ATLAS and CMS experiments in the di-jet channel, setting upper limits on the relevant couplings. We finally discuss the importance of the final states containing at least one photon making sensitivity predictions for the corresponding couplings.
Unique Signatures of Unparticle Resonances at the LHC
非粒子与标准模型（SM）希格斯玻色子的耦合导致共形对称破缺，从而在非粒子传播子中产生有效质量项。同时，非粒子与其他SM场的耦合通过单圈自能图产生有效的非粒子衰变宽度。由此产生的非粒子传播子，然后导致一个相当独特的外观形状的非粒子共振，而不是通常的布赖特-维格纳品种时，他们形成在高能量碰撞。在本文中，我们探讨是否这样的共振，出现在Drell-Yan通道在大型强子对撞机，可以区分从更传统的$Z'$的结构，这是典型的Breit-Wigner线型的代表。我们将证明，即使在大型强子对撞机的高积分亮度，它可能很难区分这两种类型的共振结构的非粒子模型参数的相当大的范围。
We explore the possibility of indirectly observing the effects of $Z'$-like particles with electroweak strength couplings in the Drell-Yan channel at the LHC with masses above the resonance direct search reach. We find that, mostly due to statistical limitations, this is very unlikely in almost all classes of models independently of the spin of the resonance. Not unexpectedly, the one possible exception to this general result is the case of degenerate Kaluza-Klein (KK) excitations of the photon and $Z$ that occur in some extra-dimensional models. In this special case, the strong destructive in…
A resonance peak in the invariant mass spectrum has been the main feature of a particle at collider experiments. However, broad resonances not exhibiting such a sharp peak are generically predicted in new physics models beyond the Standard Model. Without a peak, how do we discover a broad resonance at colliders? We use machine learning technique to explore answers beyond common knowledge. We learn that, by applying deep neural network to the case of a $t\bar{t}$ resonance, the invariant mass $M_{t\bar{t}}$ is still useful, but additional information from off-resonance region, angular correlati…
A narrow resonance decaying to dijets could be discovered at the 14 TeV run of the LHC. To quickly identify its color structure in a model-independent manner, we introduced a method based on a color discriminant variable, determined from the measurements of the resonance's production cross section, mass and width. This talk introduces a more transparent theoretical formulation of the color discriminant variable that highlights its relationship to the branching ratios of the resonance into incoming and outgoing partons and to the properties of those partons. The formulation makes it easier to p…
TeV resonances in top physics at the LHC
我们考虑了在TeV尺度上研究新粒子的可能性，通过在LHC和VLHC上产生顶夸克对来增强与顶夸克的耦合。特别是我们讨论的情况下，中性标量和矢量共振与强相互作用的电弱对称性破缺部门。我们通过施加适当的分波么正性条件和已知的低能量约束来约束这些共振的耦合。在不对初态W玻色子进行近似的情况下，我们通过WW -> tt~对各种模型的新物理信号进行了评估，并优化了信号观测的接受截断。我们的结论是，QCD背景压倒了LHC和200 TeV VLHC中的信号，使得不可能在这些机器上研究TT~通道中的这种类型的物理。
Vector boson scattering is (together with the production of multiple electroweak gauge bosons) the key process in the current run 2 of LHC to probe the microscopic nature of electroweak symmetry breaking. Deviations from the Standard Model are generically parameterized by higher-dimensional operators, however, there is a subtle issue of perturbative unitarity for such approaches for the process above. We discuss a parameter-free unitarization prescription to get physically meaningful predictions. In the second part, we construct simplified models for generic new resonances that can appear in v…
The tree-level partonic angular distribution of Standard Model $Wγ$ production possesses a feature known as the Radiation Amplitude Zero (RAZ) where destructive interference causes the cross section to vanish. At the proton level the exact cancellation disappears, however, one can find a dip in the central region of the angular distributions, here called the Radiation Valley (RV). In this paper, we show how the sensitivity for $W(\ellν)γ$ resonances can be significantly improved if one focuses on events in the RV region. Using this technique, we find that the LHC could probe a larger range of …
Top-antitop and Top-top Resonances in the Dilepton Channel at the CERN LHC
我们在大型强子对撞机上对双轻子通道中的顶-反顶和顶-顶共振进行了独立于模型的研究。在这个通道中，我们可以求解运动学系统，以获得包括两个中微子在内的所有粒子的动量，从而获得共振质量和自旋。对于发现顶-反顶共振，由于双轻子通道具有良好的轻子动量测量分辨率和小的标准模型背景，因此与半轻子通道相比具有竞争力。此外，两个轻子的电荷可以被识别，这使得双轻子通道有利于发现顶顶共振和区分共振自旋。我们讨论并提供解决方案的困难与重共振和高度提升顶夸克。
Strong WW scattering and resonances at LHC
一般强相互作用对称破缺扇区的低能动力学可以用有效手征拉格朗日量很容易地描述。事实上，在LHC的WW散射的增强，这将意味着这样的强相互作用的存在，可以描述只有两个手征参数。这些技术已经被证明可以很好地再现低能π介子-π介子散射数据，这些数据遵循类似的形式。在这项工作中，我们首先审查的LHC的灵敏度，这两个手性参数（在最困难的情况下，非共振低能量WW散射）。随后，它表明我们如何能够预测的一般共振谱的强相互作用对称性破缺部门。为此，我们使用的逆振幅方法，这也是非常成功的再生最轻的强子共振的数据在低能非共振区。因此，我们提出了一个研究的区域中的参数空间，其中一个，两个或没有共振可能出现。
A plausible explanation of the recent experimental indication of a resonance in the two-photon spectrum at LHC is that it corresponds to the CP-odd Higgs boson. We explore such a possibility in a generic framework of the two Higgs doublet models (2HDM), and combine $m_A \approx 750$GeV with the known $m_h =125.7(4)$~GeV to show that the charged Higgs boson and the other CP-even scalar masses become bounded from bellow and from above. We show that this possibility is also consistent with the electroweak precision data and the low energy observables, which we test in a few leptonic and semilepto…
Resonances and Unitarity in Weak Boson Scattering at the LHC
对标准模型的一个关键检验是对电弱规范玻色子散射的测量。在本文中，我们描述了一个通用的参数化，旨在现实的模拟弱玻色子散射在大型强子对撞机。参数化实现所有可能的自旋和同位旋组合的共振，适当匹配的低能量有效（手征）拉格朗日，包括领先的高阶效应，并包含一个最小的unitarization计划。我们实现的参数化的蒙特卡罗事件发生器WHIZARD和目前的结果完整的部分子截面积分和事件生成。我们提供了一个比较有效的W近似，以前已被用于大多数WW散射研究在强子对撞机。
The LHC is the perfect environment for the study of new physics in the top quark sector. We study the possibility of detecting signals of heavy color-octet vector resonances, through the charge asymmetry, in top-antitop+jet events. Besides contributions with the top-antitop pair in a color-singlet state, the asymmetry gets also contributions which are proportional to the color factor f_{abc}^2. This process is particularly interesting for extra-dimensional models, where the inclusive charge asymmetry generated by Kaluza-Klein excitations of the gluon vanishes at the tree level. We find that th…
Constraints on models which predict resonant top-quark pair production at the LHC are provided via a reinterpretation of the Standard Model (SM) particle level measurement of the top-anti-top invariant mass distribution, $m(t\bar{t})$. We make use of state-of-the-art Monte Carlo event simulation to perform a direct comparison with measurements of $m(t\bar{t})$ in the semi-leptonic channels, considering both the boosted and the resolved regime of the hadronic top decays. A simplified model to describe various scalar resonances decaying into top-quarks is considered, including CP-even and CP-odd…
In this paper, we derive the mass exclusion limits for the hypothetical vector resonances of a strongly interacting extension of the Standard model using the most recent upper bounds on the cross sections for various resonance production processes. The $SU(2)_{L+R}$ triplet of the vector resonances under consideration is embedded into the effective Lagrangian based on the non-linear sigma model with the $125$-GeV $SU(2)_{L+R}$ scalar singlet. No direct interactions of the vector resonance to the SM fermions are assumed. We find that among eleven processes considered in this paper only those wh…
We describe some of the future measurements to be performed by the CMS, TOTEM and ATLAS collaborations on hard diffraction in order to understand better the structure of the Pomeron. We also describe the prospects concerning the search for quartic $γγγγ$ anomalous couplings and discuss a possible interpretation for the existence of a new particle decaying into two photons at a mass of about 750 GeV.
Theoretical arguments and lattice simulations suggest that, beside the known resonance of mass $m_h=$ 125 GeV, the Higgs field might exhibit a second resonance with a larger mass $(M_H)^{\rm theor} = 690 \pm 10 ~({\rm stat}) \pm 20 ~({\rm sys})~ {\rm GeV}$ which, however, would couple to longitudinal W's with the same typical strength as the low-mass state at 125 GeV and thus represent a relatively narrow resonance mainly produced at LHC by gluon-gluon fusion. By looking for some evidence in the LHC data, we argue that the existence of a new resonance in the predicted mass region finds support…
We explore the possibility that the left-handed third generation quark doublet $q_L$ is fully composite in composite Higgs models. The signature of the model is the presence of broad spin-1 resonances strongly interacting with the third generation quark doublet $q_L$. In this case, The $t\bar{t}$ resonance search channel is comparable in sensitivity to the di-lepton channel. In addition, the same-sign di-lepton channel in the $t\bar{t}ρ$ associate production can probe the large $g_ρ$ parameter space and complementary to the Drell-Yan production channels.
The ATLAS and CMS collaborations recently presented evidence of a resonance decaying to pairs of photons around 750 GeV. In addition, the BaBar, Belle, and LHCb collaborations have evidence of lepton non-universality in the semileptonic decays of $B$ mesons. In this work, we make a first step towards a unified explanation of these anomalies. Specifically, we extend the Standard Model by including vector leptoquarks and a scalar singlet that couples linearly to pairs of the leptoquarks. We find there is parameter space that gives the correct cross section for a putative 750 GeV resonance decayi…
We investigate the discovery potential of singly produced top-philic resonances at the high luminosity (HL) LHC in the four-top final state. Our analysis spans over the fully-hadronic, semi-leptonic, and same-sign dilepton channels where we present concrete search strategies adequate to a boosted kinematic regime and high jet-multiplicity environments. We utilize the Template Overlap Method (TOM) with newly developed template observables for tagging boosted top quarks, a large-radius jet variable $M_J$ and customized b-tagging tactics for background discrimination. Our results show that the sa…
Simulation of single diffraction dissociation in resonance region at LHC energies
本文回顾低缺失质量下单衍射解离对偶模型，通过非线性Regge质子轨迹解释共振对截面的贡献，研究小$M_x$共振区微分截面行为并结合新数据优化参数，助力理解质子激发态能谱及粒子内部结构。
Motivated by what is possibly the first sign of new physics seen at the LHC, the diphoton excess at $750$ GeV in ATLAS and CMS, we present a model that provides naturally the necessary ingredients to explain the resonance. The simplest phenomenological explanation for the diphoton excess requires a new scalar state, $X(750)$, as well as additional vector-like (VL) fermions introduced in an ad-hoc way in order to enhance its decays into a pair of photons and/or increase its production cross-section. We show that the requiered VL quarks and their couplings can emerge naturally from a complete fr…
Trials Factor for Semi-Supervised NN Classifiers in Searches for Narrow Resonances at the LHC
本文通过频率学派方法量化半监督神经网络分类器在LHC窄共振搜索中优化阈值时引入的“别处观察”效应，并以模拟Zγ数据验证该效应可控。
The era of charmed resonance searches at the LHC
本文研究LHC上利用粲标记喷注搜索双喷注共振的可行性，通过模拟预测灵敏度，表明在宽松工作点下可提升对粲夸克对共振的探测能力，为粲标记器性能提供目标。
We present a complete next-to-leading order (NLO) QCD calculation to a heavy resonance production and decay into a top quark pair at the LHC, where the resonance could be either a Randall-Sundrum (RS) Kaluza-Klein (KK) graviton $G$ or an extra gauge boson $Z'$. The complete NLO QCD corrections can enhance the total cross sections by about $80\%- 100\%$ and $20\%- 40\%$ for the $G$ and the $Z'$, respectively, depending on the resonance mass. We also explore in detail the NLO corrections to the polar angle distributions of the top quark, and our results show that the shapes of the NLO distributi…
We present a study of the production of vector resonances at the LHC via $W^+Z$ vector boson scattering and explore the sensitivities to these resonances for expected LHC luminosities. We work in the framework of the electroweak chiral Lagrangian, where these resonances can be generated dynamically by unitarizing the scattering amplitudes. We implement all these features into a model adapted for MonteCarlo, the IAM-MC, that allows us to give predictions for the sensitivity to these resonances and to the relevant parameters involved for $pp \to W^+Zjj$, $pp\to \ell_1^+\ell_1^-\ell_2^+νjj$, and …
The LHC is actively searching for narrow dijet resonances corresponding to physics beyond the Standard Model. Among the many resonances that have been postulated (e.g., colored vectors, scalars, and fermions) one that would have a particularly large production rate at the LHC would be a scalar diquark produced in the s-channel via fusion of two valence quarks. In previous work, we introduced a color discriminant variable that distinguishes among various dijet resonances, drawing on measurements of the dijet resonance mass, total decay width and production cross-section. Here, we show that this…
We study the Drell-Yan process mediated by a new bosonic resonance at the LHC. The bosons of spin-0, 1, and 2 with the most general leading-order couplings to Standard Model fermions and gluons are considered, which provide a model-independent formulation for future exploration of the resonance properties, such as its spin, mass and couplings. In the case of neutral resonances, we demonstrate how the shapes of the kinematical distributions change as one varies the chiral couplings of the quarks and leptons, and show how to analyze the couplings by making use of the forward-backward asymmetry. …
We explore the possibility of explaining the recent $\sim 750$ GeV excesses observed by ATLAS and CMS in the $γγ$ spectrum in the context of a compelling theory of Naturalness. The potential spin-zero resonance responsible for the excesses also requires the existence of new heavy charged states. We show that both such features are naturally realized in a see-saw Composite Higgs model for EWSB, where the new pseudo-Goldstone bosons are expected to be comparatively heavier than the SM Higgs, and the new fermions have masses in the TeV range. If confirmed, the existence of this new resonance coul…
The scalar color octet contribution to the resonance $t\bar{t}$-pair production at the LHC is calculated and analysed with account of the one loop effective two gluon vertex. It is shown that this contribution from the scalar color octet $F_2$ predicted by the minimal model with the four color quark-lepton symmetry is for $\sqrt{s}=13$ TeV of about a few percents for $750 < m_{F_2} < 1800$ GeV and can exceed 10% for $400 < m_{F_2} < 750$ GeV. It is also pointed out that the search for the scalar octet $F_2$ as the resonance in the dijet mass spectra seems to be difficult because of the smallne…
We consider the collider signals of spin-one resonances present in full-hierarchy quiver theories of electroweak symmetry breaking. These four-dimensional theories result from the deconstruction of warped extra dimensional models and have very distinct phenomenological features when the number of sites is small. We study a class of generic scenarios in these theories where the color gauge group as well as the electroweak sector, propagate in the quiver diagram. These scenarios correspond to various specific models of electroweak symmetry breaking and fermion masses. We focus on the minimum res…
Higgs Effective Field Theory (HEFT) is deployed to study elastic vector-boson scattering at the high LHC energies. The interaction is strong over most of the parameter space, with the minimal Standard Model being a remarkable exception. One-loop HEFT complemented with dispersion relations and the Equivalence Theorem leads to two different unitarization methods which produce analytical amplitudes corresponding to different approximate solutions to the dispersion relations: the Inverse Amplitude method (IAM) and the N/D method. The partial waves obtained can show poles in the second Riemann shee…
LHC sensitivity to the resonance spectrum of a minimal strongly interacting electroweak symmetry breaking sector
我们提出了一个统一的分析在大型强子对撞机，VV融合和qqbar湮灭，在一个最小的强相互作用的电弱对称性破缺部门的两个主要生产过程的矢量玻色子对。本文采用统一的电弱手征拉格朗日形式，用形状因子模拟最终的V_L V_L强再散射效应，用控制弹性V_L V_L散射的两个手征参数描述qqbar湮灭过程.根据这两个手征参数的不同，在不同的角动量-同位旋通道中，幺正化振幅可能呈现共振增强。扫描这两个参数的空间，我们产生的一般共振谱的最小强相互作用的电弱对称性破缺部门，并确定可以探测在大型强子对撞机的区域。
We investigate, within the type-II two-Higgs-doublet extension of the standard model (SM), the impact of heavy neutral Higgs boson resonances with unsuppressed Yukawa couplings to top quarks on top-quark pair production at the LHC at next-to-leading order (NLO) in the strong coupling constant. We take into account the resonant Higgs boson contributions, the non-resonant SM $t\bar{t}$ continuum and the interference of these two contributions. The NLO QCD corrections to heavy Higgs production and the interference contributions are calculated in the large top-quark mass ($m_t$) limit, including a…
We present a phenomenological analysis of the recent Tevatron results on the $t \bar t$ forward-backward asymmetry and invariant-mass spectrum assuming a new contribution from an s-channel gluon resonance with a mass in the range from 700 to 2500 GeV. In contrast to most of the previous works, this analysis shows that for masses below ~1 TeV resonant New Physics could accommodate the experimental data. In general, we find that axial-like couplings are preferred for light and top quark couplings, and that only top quark couples strongly to New Physics. We find that composite model scenarios ari…
New massive resonances at the LHC
本文研究复合希格斯模型中自旋-1共振态的LHC唯象学，发现两个中性和一个带电共振态与SM规范玻色子混合，可在Drell-Yan过程中单举产生，质量可低至1.5 TeV且与现有数据一致。
Measuring Electroweak Quantum Numbers of Color Sextet Resonances at the LHC
本文研究如何在13 TeV LHC上通过同号顶夸克对衰变中底夸克和轻子的角分布及能量分布，区分颜色六重态标量和矢量共振的电弱量子数。
We introduce a simplified low-energy effective Lagrangian description of the phenomenology of heavy vector resonances in the minimal composite Higgs model, based on the coset SO(5)/SO(4), analysing in detail their interaction with lighter top partners. Our construction is based on robust assumptions on the symmetry structure of the theory and on plausible natural assumptions on its dynamics. We apply our simplified approach to triplets in the representations (3, 1) and (1, 3) and to singlets in the representation (1, 1) of SO(4). Our model captures the basic features of their phenomenology in …
Neutral $Z$ boson pair production due to radion resonance in the Randall-Sundrum model: prospects at the CERN LHC
在大型强子对撞机（LHC）上，由于Radion共振而产生的中性$Z$玻色子对是探索扭曲几何（Randall-Sundrum模型）概念的一个有趣过程。由于迹线异常和顶（夸克）环增强了镭子与一对胶子的耦合，镭子可以提供比任何新物理效应更大的事件率可能性。使用适当的放射性顶-反顶（夸克离壳）耦合，我们得到了正确的Radion生产率在大型强子对撞机和探索的几个特点，较重的Radion衰变成一对真正的$Z$玻色子，随后衰变成带电的$4 l (l=e, μ)$轻子（镀金模式）。使用信号和背景事件率，我们得到了在$5σ$，$10σ$发现水平上的Radion质量$m_ϕ$和Radion vev $\vphi$的界限。
Higgs mass saturation effect and the LHC discovery potential
鉴于最近的微扰和非微扰的证据表明，随着耦合的增加，希格斯共振的峰值饱和，我们研究了未来的大型强子对撞机的潜力，发现一个沉重的希格斯共振胶子融合。
The impact of the fourth Standard Model family on Higgs boson search at Tevatron and LHC is reviewed.
Searching for two-body resonance decays is a central component of the high energy physics energy frontier research program. While many of the possibilities are covered when the two bodies are Standard Model (SM) particles, there are still significant gaps. If one or both of the bodies are themselves non-SM particles, there is very little coverage from existing searches. We review the status of two-body searches and motivate the need to search for the missing combinations. It is likely that the search program of the future will be able to cover all possibilities with a combination of dedicated …
Prospects for sgoldstino search at the LHC
在本文中，我们估计的LHC sgoldstino发现的潜力与伽玛和ZZ的签名在一个最终的状态。
扫码添加微信好友，提出您的宝贵建议 👇
💡 备注请填写：网站反馈
发表机构由 AI 从论文文本抽取，如发现错误，欢迎反馈修正建议。