LHC signatures for Z` models with continuously distributed mass
N. V. Krasnikov
本文讨论了质量连续分布的可重正化Z`模型的唯象结果。我们指出，Drell-Yan反应$pp \to Z^{`} \to l^+l^-$中存在宽共振是这种模型的一个可能的LHC特征.
We discuss phenomenological consequences of renormalizable Z` models with continuously distributed mass. We point out that one of possible LHC signatures for such nodel is the existence of broad resonance in Drell-Yan reaction $pp \to Z^{`} \to l^+l^-$.
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We study the Large Hadron Collider (LHC) discovery potential for $Z^`$ models with continuously distributed mass for $\sqrt{s} = 7, 10$ and 14 TeV centre-of-mass energies. One of possible LHC signatures for such models is the existence of broad resonance in Drell-Yan reaction $pp \to Z^` + ... \to l^+l^- + ...$.
We discuss experimental signatures relevant for the LHC domain of energies allowing to discriminate possible asymptotic modes of hadron interactions.
An algorithm is developed which the goal of producing the most statistically significant signature list for distinguishing between two candidate models given a set of LHC observations.
SUSY Signatures at LHC
欧洲核子研究中心（CERN）大型强子对撞机（LHC）的ATLAS和CMS合作组织已经投入了相当大的努力来研究超对称性的签名和测量。这个演讲提供了一个概述，如果TeV级超对称性存在，在LHC可以学到什么。
We present the phenomenology of a supersymmetric model with sneutrino as the next to lightest supersymmetric particle (NLSP) in the gravitino dark matter scenario at the LHC. We focus on the leptonic signatures and study the feasibility of a particular trilepton signature as a possible discovery channel of supersymmetry.
Cascade seesaw mechanism generates neutrino mass at higher dimension (5+4n) operators through tree level diagram which bring the seesaw scale down to TeV and provide collider signatures within LHC reach. In particular, both Type-II scalar and Type-III heavy fermion seesaw signatures exist in such a scenario. Doubly charged scalar decays into diboson is dominant. We perform a thorough study on the LHC signals and the Standard Model background. We draw the conclusion that multilepton final state from interplay of doubly charged scalar and heavy fermion can provide distinguishable signatures from…
We discuss the implications of a gauged Abelian hidden-sector communicating with the Standard Model (SM) fields via kinetic mixing with the SM hypercharge gauge field, or via the Higgs quartic interaction. We discuss signatures of the hidden-sector gauge boson at the LHC in the four-lepton channel. We show that a hidden-sector fermion can be a natural dark-matter candidate with the correct relic-density, discuss direct-detection prospects, and show how Higgs signatures may be altered at the LHC.
Signature of Charged to Neutral Higgs Boson Decay at the LHC in SUSY Models
我们研究了超对称模型中$H^\pm$在LHC上衰变为$h^0W$的特征。它在MSSM中只有边缘可行性。但在单态扩展中，如NMSSM，可以在参数空间的重要域上具有$H^\pm$衰减为$(h^0,A^0)W$的壮观签名。
We investigate the heavier electroweakino sectors in several versions of the MSSM, which has not been explored so far in the light of the LHC data, and obtain new bounds using the ATLAS Run I constraints in the $3l + {E\!\!\!\!/_T}$ channel. We also venture beyond the trilepton events and predict several novel multilepton + ${E\!\!\!\!/_T}$ signatures of these electroweakinos which may show up before the next shutdown of the LHC.
Signatures of soft supersymmetry breaking at the CERN LHC and in dark matter experiments are discussed with focus drawn to light superparticles, and in particular light gauginos and their discovery prospects. Connected to the above is the recent PAMELA positron anomaly and its implications for signatures of SUSY in early runs at the Large Hadron Collider. Other new possibilities for physics beyond the Standard Model are also briefly discussed.
LHC Signatures of MSSM Higgs-sector CP Violation
我们讨论了几个新的特征环诱导MSSM希格斯扇区CP破坏在LHC的基础上的两个方案：（i）CPX和（ii）三混频。
We investigate the rare radiative decays of extra gauge neutral bosons. In particular, we established the theoretical predictions for the production of unparticle in decays of $Z^{\prime}$ - bosons. The implementation of our prediction in the analysis at the LHC experiments should be straightforward and lead to more precise determination or limits of unparticle couplings and/or $Z^{\prime}$ couplings and masses.
SUSY Signatures in ATLAS at LHC
本次演讲总结了欧洲核子研究中心大型强子对撞机上的ATLAS合作研究超对称粒子和希格斯玻色子以及对其性质的可能测量。
Signatures of Dynamical Symmetry Breaking at Tevatron Upgrade and LHC
我们研究了强相互作用电弱对称性破缺扇区的唯象，其中物理学由自旋1共振主导。具体来说，我们将考虑一个有效的描述动力学对称性破缺的基础上，通过所有的低能量精度测试，并给出清晰的信号在大型强子对撞机，但也在Tevatron升级的特定模型。
Identification of the Origin of Monojet Signatures at the LHC
几种新的物理方案可以导致LHC的单喷流特征。如果在高于标准模型背景的情况下观察到此类事件，则识别其来源将是重要的。在本文中，我们比较和对比这些签名中产生的两个非常不同的图片：矢量或标量非粒子生产的标度不变/共形制度和引力子发射的Arkani Hamed，Dimopoulos和Dvali额外的维模型。我们证明，这两种情况下，可以区分在大型强子对撞机的模型参数的合理范围内，通过其各自的单喷流和/或丢失的$E_T$分布的形状。
Signatures of an invisibly decaying Higgs particles at LHC
在Majoron模型中，Higgs粒子可以衰变到一个不可见的通道中。我们已经探索了在大型强子对撞机上通过与胶子、Z或W玻色子的相关产生来检测这样一种希格斯粒子的前景。虽然信号/背景比对于第一个过程来说太小，但后两个过程为检测这样的希格斯粒子提供了可行的特征。
We investigate production and detection prospects of the quintuplet heavy leptons at the LHC in the context of a new model which is proposed as a viable and testable solution to the neutrino masses problem. We classify the signals, carry out a full simulation on the signals and the relevant backgrounds at the 14 TeV LHC. After applying suitable kinematic cuts, the background events are substantially suppressed. The signals of the heavy leptons might be detected at the 14 TeV LHC.
Dictionary of LHC Signatures
我们报告的计划，建立一个“字典的LHC签名”，一个倡议，在2008年1月的WHEPPX研讨会开始。本研究的目的是区分3类暗物质激发的方案，如R-宇称守恒超对称，小希格斯模型与T-宇称守恒和通用额外维度与KK-宇称的实现在广泛的模型空间的一般情况下的策略。鉴别特征已制成表格，需要进一步详细分析。
The advent of the LHC, and the proposal of building future colliders as the ILC, both programmed to explore new physics at the TeV scale, justifies the recent interest in studying all kind of seesaw mechanisms whose signature lies on such energy scale. The natural candidate for this kind of seesaw mechanism is the inverse one. The conventional inverse seesaw mechanism is implemented in an arrangement involving six new heavy neutrinos in addition to the three standard ones. In this paper we develop the inverse seesaw mechanism based on Higgs triplet model and probe its signature at the LHC and …
Signature of the Intermediate Mass Higgs Boson at the LHC With Flavor Tagging
我们重新访问的独家签名$e^\pm (μ^\pm) + b\bar b$在相关生产的中间质量希格斯玻色子与$W$玻色子。我们表明，它是可行的，使用这个签名，以确定希格斯玻色子在较低的中间质量区域（$90$到$130$ GeV）在LHC合理的接受削减假设有效的底喷流识别。我们进一步证明，背景可以减少明智的削减到信号的水平。
We discuss a field theoretical framework to describe the interactions of non-thermal quantum black holes (QBHs) with particles of the Standard Model. We propose a non-local Lagrangian to describe the production of these QBHs which is designed to reproduce the geometrical cross section for black hole production. This model is implemented into CalcHEP package and is publicly available at the High Energy Model Database (HEPMDB) for simulation of QBH events at the LHC and future colliders. We present the first phenomenological application of the QBH@HEPMDB model with spin-0 neutral QBH giving rise…
Leptonic signatures of Dark Matter (DM) are one of the cleanest ways to discover such a secluded form of matter at high energy colliders. We explore the full parameter space relevant to multi-lepton (2- and 3-lepton) signatures at the Large Hadron Collider (LHC) from representative minimal consistent models with scalar and fermion DM. In our analysis, we suggest a new parametrisation of the model parameter spaces in terms of the DM mass and mass differences between DM and its multiplet partners. This parametrisation allows us to explore properties of DM models in their whole parameter space. T…
Little Higgs models are often endowed with a T-parity in order to satisfy electroweak precision tests and give at the same time a stable particle which is a candidate for cold dark matter. This type of models predicts a set of new T-odd fermions in addition to the heavy gauge bosons of the Little Higgs models, which may show interesting signatures at colliders. In this paper, we study the signatures of strong and electroweak pair production of the first two generations of T-odd quarks at the LHC. We focus on the dileptonic signatures (p p to l l j j MET) with (a) opposite-sign dileptons and (b…
In this letter, we investigate the production of light dark matter particles at LHC in light of the model (N = 2 SUSY inspired) proposed in Ref. [1] and demonstrate that they will be copiously produced if the colored messengers Fq are lighter than 1 TeV. We expect up to a million events if the Fq mass is about 500 GeV, assuming a ~1 inverse fb luminosity. In addition, we show that, even if the Fq mass is above a few TeV, searches for Fq production at LHC are promising because a kinematical signature can be used to separate the signal from background. This signature is similar to that expected …
The Hadronic Tau Decay Signature of a Heavy Charged Higgs Boson at LHC
强子τ衰变通道为大型强子对撞机在大$\tanβ$区域寻找重电荷希格斯玻色子玻色子提供了迄今为止最好的信号。通过利用tau的独特极化和它的大横向质量，以及伴随的缺失- $p_T$，人们可以在基本上无背景的环境中探测质量高达约600 GeV的带电希格斯玻色子。τ喷流的横向质量分布也提供了一个相当明确的带电希格斯玻色子质量的估计。
A new signature for color octet pseudoscalars at the LHC
彩色八重态（伪）标量，如果它们存在的话，将在欧洲核子研究中心的大型强子对撞机（LHC）中大量产生。然而，它们的检测可能成为一项非常具有挑战性的任务。特别是，如果它们衰变成一对顶夸克是运动学禁止的，那么主要的衰变通道将是两个喷流，具有非常大的背景。在这份简报中，我们探讨了在大型强子对撞机上利用反常引起的色八重态赝标量衰变为规范玻色子的可能性。
Sharpening up the Charged Higgs Boson Signature using Tau Polarization at LHC
由带电的希格斯玻色子和$W$玻色子衰变产生的$τ$极化的相反状态可以被利用来增强$τ$的包含1-prong强子衰变通道中的$H^\pm$信号。我们提出了利用这个想法来锐化LHC顶夸克衰变中的$H^\pm$特征的实用方法。因此，人们可以在MSSM的整个参数空间上，在父顶夸克质量的$\sim 20 GeV$范围内进行带电希格斯玻色子的搜索。
Signatures of gaugino mass non-universality in cascade Higgs production at the LHC
超对称级联，包括电荷伴子和中性伴子在不同的阶段，有助于在大型强子对撞机的希格斯生产的重要方式。我们探索这种级联的性质，完全放松了高吉诺群众的普遍性。结果发现，从普适的高吉诺质量的情况下的偏差将反映在相对生产率最轻的希格斯和带电的希格斯，两个扩展的希格斯部门的特征粒子。
The di-photon signature of Higgs bosons in GMSB models at the LHC
我们展示了如何研究$γγ$包容希格斯信号可以在大型强子对撞机测试规范介导的超对称破缺的情况下，一个相当重的希格斯玻色子玻色子衰变成两个轻的中性伴子，后者产生两个光子和失踪（横向）的能量
The three-leptons signature from resonant sneutrino production at the LHC
通过三轻子签名研究了在大型强子对撞机上通过R宇称破坏耦合$ł'_{ijk} L_i Q_j D^c_k$共振产生超中微子的过程。使用ATLAS探测器的快速模拟进行详细的粒子水平的研究信号和背景。通过对级联衰变的完全重建，可以对所涉及的超粒子的质量进行与模型无关的精确测量。此外，该签名可以在大部分的超对称参数空间和几个$ł'_{ijk}$耦合常数的大范围的值中被检测到。
We discuss two striking Large Hadron Collider (LHC) signatures of the constrained version of the exceptional supersymmetric standard model (cE6SSM), based on a universal high energy soft scalar mass m_0, soft trilinear coupling A_0 and soft gaugino mass M_{1/2}. The first signature we discuss is that of light exotic colour triplet charge 1/3 fermions, which we refer to as D-fermions. We calculate the LHC production cross section of D-fermions, and discuss their decay patterns. Secondly we discuss the E6 type U(1)_N spin-1 Z' gauge boson and show how it may decay into exotic states, increasing …
Like Sign Dilepton Signature for Gluino Production at LHC with or without R Conservation
在大强子对撞机能量下，研究了$R$守恒以及$L$和$B$破坏SUSY模型下的孤立类符号双轻子产生.对于$R$守恒和$L$违反模型，人们得到了300和600 GeV的胶子质量的可行信号，而对于$B$违反的情况则不太有希望。对于1000 GeV的胶子，$L$破坏信号应该仍然是可行的;但是$R$守恒信号变得太小了，至少对于LHC的低光度选择来说是这样。
We have examined the dijet production at the LHC as a hint to discovery of string Regge excitations of Standard Model particles. If the fundamental string mass scale is in the TeV range, the influence of string effects on the $pp$ interaction can arise as new resonances in the dijet invariant mass distribution. Near the first resonant pole we investigate the impact of the subprocesses with quark-gluon and four-gluon separately. We show that the LHC is able to probe the string mass scale $\sim$5 TeV with only 2 pb$^{-1}$ of integrated luminosity at $E_{CM}=14$ TeV.
The process $pp \to W^+W^+jj$ gives rise to an exotic Standard Model signature at the LHC, involving high-$p_{\perp}$ like-sign leptons, missing energy and jets. In this brief article the motivation for study, along with selected results from the computation of NLO QCD corrections to the QCD-mediated part of this process\cite{us} are presented. It is shown that the corrections reduce the dependence of the cross-section on renormalisation and factorisation scales, and produce a relatively hard third jet in a significant fraction of events.
The study of multiparticle dynamics in hadron-hadron collisions at Tevatron and LHC could provide useful information on new physics in addition to the expected signatures on the transverse plane. We suggest that an analysis of inclusive correlations between emitted particles in $pp$ inelastic collisions, and factorial moments of multiplicity distributions, may be helpful in uncovering (un)particles from Hidden Sectors, using underlying events tagged by hard products like high $p_T$ leptons and photons, and applying stringent selection criteria like event shape variables, etc
In this paper, we discuss the potential of observing heavy neutrino ($ν_h$) signatures of a $U(1)_{B-L}$ enlarged Standard Model (SM) encompassing three heavy Majorana neutrinos alongside the known light neutrino states at the Large Hadron Collider (LHC). We exploit the theoretical decay via a pair of heavy (non-SM-like) Higgs boson and $Z'$ production followed by $ν_h \rightarrow l^\pm W^{\mp (*)}$ and $ν_h \rightarrow ν_l Z^{(*)}$ decays, ultimately yielding a $3l+2j+E_{T}^{\rm{miss}}$ signature and, depending upon how boosted the final state objects are, we define different possible selecti…
We study the signature of dilepton and a hard jet ($\ell^+\ell^-j$) via heavy new gauge boson production in split universal extra dimension scenario where the Kaluza-Klein parity is conserved but the Kaluza-Klein number is not. A hard cut to the jet energy effectively removes virtually all possible backgrounds and provides a handle to search of new physics involving new neutral heavy states as the Kaluza-Klein $Z$ boson. The signature can be more generically used in search of other new states such as graviton and radion in warped extra dimension models.
We consider non-abelian kinetic mixing between the Standard Model SU(2$)_L$ and a dark sector U(1$)^\prime$ gauge group associated with the presence of a scalar SU(2$)_L$ triplet. The magnitude of the resulting dark photon coupling $ε$ is determined by the ratio of the triplet vacuum expectation value, constrained to by $\lsim 4$ GeV by electroweak precision tests, to the scale $Λ$ of the effective theory. The corresponding effective operator Wilson coefficient can be $\mathcal{O}(1)$ while accommodating null results for dark photon searches, allowing for a distinctive LHC dark photon phenomen…
We discuss our recent progress on improving the theoretical description of the $pp \to t\bar{t}W^\pm$ process with particular focus on fiducial signatures that include top-quark decays. We employ a wide range of techniques from parton shower matching, narrow width approximation to full off-shell computations to assess the importance of the different modeling approaches.
Possible experimental signatures at the LHC of strongly interacting electro-weak symmetry breaking
如果电弱对称性被一个新的强相互作用扇区打破，新的物理学可能会在LHC的规范玻色子散射中显现出来。相关的动力学很好地描述了一个有效的拉格朗日。我们讨论了可能的大小的系数的相关运营商的模型独立的约束条件和合理的假设的基础上的两个模型的强相互作用的部门相结合。我们将这些值与LHC灵敏度进行比较，并认为它们太小而无法看到。因此，酉性所要求的矢量和标量共振的存在将是唯一的特征签名。我们分析了这些共振的最可能的质量和宽度。
pp Elastic Scattering at LHC and Signature of Chiral Phase Transition at Large |t|
本文将一个先前用来分析ISR和SPS对撞机数据的$pp$和$\bar{p}p$弹性散射模型推广到计算LHC在c. m时的$pp$弹性微分截面。能量为14 TeV，动量转移范围为$|t|=0$ - 10 GeV $^2$。讨论了规范线性$σ$模型作为描述核子结构和弹性散射的基本场论模型的作用。指出了在LHC的TOTEM计划中发现大$|t|$手性相变的可能性。
If supersymmetry is broken at TeV scale, particles from sector responsible for supersymmetry breaking - goldstino and sgoldstinos - can reveal themselves already at the LHC experiments. We discuss bounds on supersymmetry breaking scale from the LHC searches for events with a jet plus missing momentum signature focusing on the case of TeV scale sgoldstinos. We show that contribution of light sgoldstinos to the cross section of of gravitino pair production with a jet can be sizable and the bounds on the gravitino mass can be stronger by up to a factor of 2 as compared to those obtained in the he…
Flavored Dark Matter: Freeze-out Scenarios and LHC Signatures
该研究在暗最小风味破坏框架下提出简化暗物质模型，探索其参数空间，发现转换驱动冻结等新情景，并研究LHC信号，展示比单风味暗物质更丰富的唯象学。
We study the Singlet-Doublet dark matter model in the regime of feeble couplings, where the dark matter abundance is obtained via the freeze-in mechanism. As a consequence of the small couplings, the heavier particles in the model are long-lived with decay length at typical scales of collider experiments. We analyse the collider signatures of the model, characterised by displaced $h$ and $Z$ bosons plus missing momentum, employing current LHC searches for displaced vertices and missing energy to significantly constrain the parameter space of the model. We also take into account the cosmologica…
We study the LHC signature of the minimal supersymmetric standard model with non-universal sfermion masses. In the model, soft masses of gauginos and the 3rd generation of 10 of SU(5) are around the weak scale, while other sfermion soft mass is universal and around a few TeV. Such sfermion mass spectrum is motivated not only from flavor, CP and naturalness constraints but also from E_6 grand unified model with non-Abelian horizontal (flavor) symmetry. The characteristic signature of the model at the LHC is the dominance of the events with 4 b partons in the final state together with high rate …
Supersymmetry Signatures at the CERN LHC
这些讲座，在1997年TASI暑期学校给出，描述了发现超对称性（SUSY）和研究其性质在大型强子对撞机（LHC）在欧洲核子研究中心的前景。如果超对称性存在于小于1- 2 TeV的质量尺度上，那么在大型强子对撞机上应该很容易观察到与标准模型的特性偏差。由于在大多数模型中，每个事件中都有两个丢失的粒子\tilde χ_1^0，因此确定超对称质量更加困难。然而，可以使用各种运动学分布来精确测量超对称质量和其他与超对称物理学相关的量的组合。在有利的情况下，这样的测量在大型强子对撞机可以确定参数的基础超对称模型具有良好的精度。
Like-sign dilepton signature for gluino production at LHC including top quark and higgs boson effects
在考虑顶夸克和希格斯玻色子级联衰变效应的$R$ -守恒最小超对称标准模型中，系统地分析了LHC产生胶子的类号双子特征.我们考虑两个代表性的值的胶子质量，300和800 GeV，以及其他超对称参数。前一种情况下，顶夸克的贡献在运动学上被抑制了，而后一种情况下，顶夸克的贡献则非常重要。讨论了从背景中分离信号的方法。人们期望在LHC的低（高）光度选择下，在MSSM的实际整个参数空间上，LSD信号的可行性高达$\sim 800$（1200）GeV的胶子质量。
We study the possible LHC collider signatures in the next-to-minimal supersymmetric Standard Model (NMSSM). The general NMSSM consists of 29 supersymmetric (SUSY) particles which can be mass ordered in $29! \simeq 9 \cdot 10^{30}$ ways. To reduce the number of hierarchies to a more manageable amount we assume a degeneracy of the sfermions of the first two generations with the same quantum numbers. Further assumptions about the neutralino and chargino masses leave 15 unrelated parameters. We check all $15! \approx 10^{12}$ relevant mass orderings for the dominant decay chains and the correspond…
GMSB SUSY models with non pointing photons signatures in ATLAS at the LHC
非指向光子的重构是研究LHC规范介导超对称破缺（GMSB）模型的一个重要特征。在这篇文章中，角分辨率的ATLAS电磁量能器的特点是从详细的模拟检测器。由此产生的性能是用来重建GMSB事件的快速模拟程序，考虑到重建效果。最后，估计了提取s粒子质量和最轻中性伴子寿命的灵敏度。
In this manuscript, we study the LHC signatures of a non-standard heavy neutral Higgs boson H at the 14 TeV LHC model-independently by taking the anomalous HVV coupling constants in the possible range obtained in our previous paper, Ref.[1]. We suggest WW scattering and VH associated production as two sensitive processes for detecting H, and the latter is more sensitive than the former. The study is at the hadron level with signals and backgrounds carefully calculated. Certain kinematic cuts are proposed to suppress the backgrounds effectively. We take several values of the heavy Higgs masses …
We study the possibility of observing the stau signal at LHC in case that the gravitino is the lightest supersymmetric particle and the stau is the next lightest supersymmetric particle in high reheating temperature scenario. We show that a number of stau signals can be observed at LHC for $\sqrt{s}=7 {\rm TeV}$ and an integrated luminosity of $1 {\rm fb}^{-1}$ in most of the parameter region for the reheating temperature $T_R\gsim{\cal O}(10^8) {\rm GeV}$. We also show that the parameter region with $T_R\gsim2\times10^9 {\rm GeV}$, which is consistent with the thermal leptogenesis, is all cov…
The neutrinophilic two-Higgs-doublet model ($ν$2HDM) provides a natural way to generate tiny neutrino mass from interactions with the new doublet scalar $Φ_ν$ ($H^\pm,~H,~A$) and singlet neutrinos $N_R$ of TeV scale. In this paper, we perform detailed simulations for the lepton number violating (LNV) signatures at LHC arising from cascade decays of the new scalars and neutrinos with the mass order $m_{N_R}<m_{Φ_ν}$. Under constraints from lepton flavor violating processes and direct collider searches, their decay properties are explored and lead to three types of LNV signatures: $2\ell^\pm 4j+…
In this paper, we perform a detailed analysis on the same-sign dilepton signature in the inert doublet model. Focusing on the low dark matter mass region, we randomly scan the corresponding parameter space. Viable samples allowed by various constraints are obtained, among which twenty benchmark points are selected for further collider signature study. At hadron colliders, the same-sign dilepton signature is produced via $pp\to W^{\pm *}W^{\pm *}jj \to H^\pm H^\pm jj$ with the leptonic decay mode $ H^\pm \to HW^\pm (\to l^\pm ν)$, where $H$ is the dark matter candidate. We investigate the testa…
We discuss the possible enhancement of the tau lepton events at LHC when the left-handed stau doublet becomes light (which can be even lighter than the right-handed stau). This is illustrated in the constrained supersymmetric seesaw model where the slepton doublet mass is suppressed by the effects of a large neutrino Yukawa coupling. We study a few representative parameter sets in the sneutrino coannihilation regions where the tau sneutrino is NLSP and the stau coannihilation regions where the stau is NLSP both of which yield the thermal neutralino LSP abundance determined by WMAP.
Signatures of Strong Electroweak Symmetry Breaking in pp -> b \bar{b} t \bar{t} + X at LHC
我们研究了LHC中强电弱对称破缺扇区可能产生的$ρ$共振。由于$ρ$与顶夸克和底夸克的耦合可能增强，我们将重点放在过程pp -> b \bar{b} t \bar{t}上，其中b \bar{b}或t \bar{t}是$ρ$衰变的产物。
LHC Signature of the Minimal SUGRA Model with a Large Soft Scalar Mass
由于焦点现象，最小SUGRA模型具有大于1 TeV的大软标量质量是很自然的{ \it}。这个模型的一个显著特征是一个倒置的层次结构，其中较轻的停止具有比其他方星和slepton小得多的质量。因此，预测的胶子衰变主要通过停止交换到一个通道包含2b和2 W随着LSP。我们利用这一特性，在LHC上，在具有3-4个b-标签和大的缺失-E_T的轻子通道中，为该模型构建了一个鲁棒的签名。
In the framework of the RSII-n model with n compact and one infinite extra dimensions, we study the production of Z-bosons and photons, which escape into the bulk, in association with a jet in pp collisions at the LHC energies. This would show up as the process pp -> jet+bulk. We calculate the distributions in the jet transverse momentum and rapidity and compare them with the Standard Model background pp->jet +ν\barν.We find that the models with n>3 can be probed at the collision energy 14 TeV, while searches at 7 TeV are sensitive to models with n>5 only.
We present a sensitivity study for the pair-production of supersymmetric particles which decay through R-parity violating channels. As the scope of possible RPV signatures is very broad, the reach of several selected signatures spanning a representative variety of possible final states is considered. Preference in representation is given to spectra motivated by naturalness, i.e. light higgsinos, stops and gluinos. The sensitivity studies are presented for proton-proton collisions at 14 TeV with an integrated luminosity of 300 and 3000 fb^-1, as well as at 33 TeV with an integrated luminosity o…
In this work we give a comprehensive analysis on the phenomenology of a specific $\mathbb{Z}_3$ dark matter (DM) model in which neutrino mass is induced at two loops by interactions with a DM particle that can be a complex scalar or a Dirac fermion. Both the DM properties in relic density and direct detection and the LHC signatures are examined in great detail, and indirect detection for gamma-ray excess from the Galactic Center is also discussed briefly. On the DM side, both semi-annihilation and co-annihilation processes play a crucial role in alleviating the tension of parameter space betwe…
Hadrons as Signature of Black Hole Production at the LHC
在具有几个大的额外维度和1 TeV量级的基本普朗克尺度的模型中，黑洞可以在LHC能量下大量产生。本文计算了LHC上p-p碰撞和Pb+Pb碰撞产生的黑洞衰变的带电强子谱。结果表明，与通常的QCD过程相比，在横动量p_T>30-100 GeV/c时，黑洞衰变产生的强子占主导地位，并且在强子横动量谱中容易识别出黑洞产生的信号.此外，我们表明，测量的带电强子谱探针普朗克尺度高达~5 TeV的任何数量的额外的维度。
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