New physics search in the LHCb era
Tobias Hurth
我们目前的理论和实验准备间接寻找新的物理使用稀有衰变$\bar B_d \to \bar K^* l^+ l^-$。我们设计了新的观测值，具有很小的理论不确定性和良好的实验分辨率。
We present theoretical and experimental preparations for an indirect search for new physics using the rare decay $\bar B_d \to \bar K^* l^+ l^-$. We design new observables with very small theoretical uncertainties and good experimental resolution.
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These proceedings present the LHCb results on Majorana neutrino searches and direct production of exotic particles using the data collected during Run I of LHC. For the former, Majorana neutrinos are searched for both on-shell and off-shell in $B$ and $D$ decays to final states with two same-sign muons. For the latter, different types of new particles are studied profiting the unique coverage of LHCb with respect to other detectors.
We propose an inclusive search for dark photons $A'$ at the LHCb experiment based on both prompt and displaced di-muon resonances. Because the couplings of the dark photon are inherited from the photon via kinetic mixing, the dark photon $A' \to μ^+ μ^-$ rate can be directly inferred from the off-shell photon $γ^* \to μ^+ μ^-$ rate, making this a fully data-driven search. For Run 3 of the LHC, we estimate that LHCb will have sensitivity to large regions of the unexplored dark-photon parameter space, especially in the 210-520 MeV and 10-40 GeV mass ranges. This search leverages the excellent in…
Rare decays of heavy-flavoured particles provide an ideal laboratory to look for deviations from the Standard Model, and explore energy regimes beyond the LHC reach. Decays proceeding via electroweak penguin diagrams are excellent probes to search for New Physics, and $b \to s \ell^{+}\ell^{-}$ processes are particularly interesting since they give access to many observables such as branching fractions, asymmetries and angular observables. Recent results from the LHCb experiment are reviewed.
Search for Bs,d->mumu at LHCb with 300 pb-1
在欧洲核子研究中心（CERN）的大型强子对撞机（LHCb）实验收集的~300 pb-1的pp碰撞中，在sqrt（s）= 7 TeV的能量下，对Bs->mumu和Bd->mumu衰变进行了研究.在95%置信水平下，Bs->mumu衰变的分支分数的测量极限为BR（Bsmumu）< 1.6 × 10^{-8}，而在95%置信水平下，Bd->mumu衰变的分支分数的测量极限为BR（Bd->mumu）< 5.1 × 10^{-9}。结合2010年LHCb数据集，在95%置信水平下得出BR（Bs->mumu）<1.5 x 10^{-8}的限值。
A Possibility of Search for New Physics at LHCb
在LHCb上寻找标准模型之外的新物理是很有趣的。我们认为双粲重子如$Ξ_{cc}(3520)^+, Ξ_{cc}^{++}$到无粲末态的弱衰变可能是新物理学的一个信号。本文以非粒子模型和$Z'$模型为例，研究了这两种可能性。我们还讨论了尚未观察到的$Ξ^0_{bb}, Ξ_{bb}^-$的情况，但当LHCb开始运行时，人们可以期望找到它们。我们的数值计算结果表明，这两种模型都不能产生足够大的衰变宽度，因此，如果在LHCb上观察到这样的模式，那么除了非粒子模型或$Z'$模型之外，一定还有新的物理机制.
Our community has to apply {\em non}-perturbative QCD on different levels of flavor dynamics in strange, charm \& beauty hadrons and even for top quarks. We need {\em consistent} parameterization of the CKM matrix and describe weak decays of beauty hadrons with {\em many-body} final states. It is crucial to use the {\em Wilsonian} OPE as much as possible and discuss "duality" in the worlds of quarks and hadrons. The pole mass of heavy quarks is {\em not} well-defined on the {\em non}-perturbative level -- i.e., it is {\em not} Borel summable in total QCD. We need a novel team to combine the st…
We propose a search for dark photons $A^{\prime}$ at the LHCb experiment using the charm meson decay $D^*(2007)^0 \!\to D^0 A^{\prime}$. At nominal luminosity, $D^{*0} \!\to D^0 γ$ decays will be produced at about 700kHz within the LHCb acceptance, yielding over 5 trillion such decays during Run 3 of the LHC. Replacing the photon with a kinetically-mixed dark photon, LHCb is then sensitive to dark photons that decay as $A^{\prime}\!\to e^+e^-$. We pursue two search strategies in this paper. The displaced strategy takes advantage of the large Lorentz boost of the dark photon and the excellent v…
We study the potential of the LHCb experiment to discover, for the first time, the $μ^+μ^-$ true muonium bound state. We propose a search for the vector $1^3S_1$ state, $\mathcal{T\!M}$, which kinetically mixes with the photon and dominantly decays to $e^+e^-$. We demonstrate that a search for $η\to γ\mathcal{T\!M}$, $\mathcal{T\!M}\to e^+e^-$ in a displaced vertex can exceed a significance of 5 standard deviations assuming statistical uncertainties. We present two possible searches: an inclusive search for the $e^+e^-$ vertex, and an exclusive search which requires an additional photon and a …
Lepton Flavour Universality tests and Lepton Flavour Violation searches at LHCb
本文综述了 LHCb 合作组在 $b\to s\ell\ell$ 和 $b\to c\ellν$ 衰变中发现偏离轻子味普适性的迹象，以及对轻子味破坏过程的搜寻与未来升级前景。
We comment on the results of the recent search by the LHCb collaboration for the doubly charmed baryon $Ξ_{cc}^+$.
A search is presented for a hidden-sector boson, $χ$, produced in the decay $B^0 \rightarrow K^* (892)^0 χ$, with $K^* (892)^0 \rightarrow K^+ π^-$ and $χ\rightarrow μ^+ μ^-$ . The search is performed using a $pp$-collision data sample collected at $\sqrt{s}=7$ and 8 TeV with the LHCb detector, corresponding to integrated luminosities of 1 and 2 fb$^{-1}$ respectively. No significant signal is observed in the mass range $214 \le m_χ\le 4350$ MeV, and upper limits are placed on the branching fraction product $\mathcal{B}(B^0 \rightarrow K^* (892)^0 χ) \times \mathcal{B}(χ\rightarrow μ^+ μ^- )$ …
We consider $X(3872)$ and $Y(4140)$ as the vector tetraquark states of $X_c^0\equiv c\bar c u\bar u(d\bar d)$ and $c\bar c s\bar s$, respectively. By connecting $Λ_b\to X_c^0Λ$ to $B^-\to X_c^0 K^-$, we predict that the branching ratios of $Λ_b\to Λ(X(3872)^0\to) J/ψπ^+π^-$ and $Λ_b\to Λ(Y(4140)\to) J/ψϕ$ are $(5.2\pm 1.8)\times 10^{-6}$ and $(4.7\pm 2.6)\times 10^{-6}$, which are accessible to the experiments at the LHCb, respectively. The measurements of these $Λ_b$ modes would be the first experimental evidences for the $XYZ$ states in baryonic decays.
New results on the search for $B^0_s\rightarrow μ^+μ^-$ from LHCb
利用LHCb实验，使用在$\sqrt s=8$收集的1.1\，fb $^{-1}$数据，对稀有衰变$B^0_s\rightarrow μ^+μ^-$和$B^0\rightarrow μ^+μ^-$进行搜索，TeV $ and 1.0\,fb$ ^{-1} $ of data collected at $ \sqrt s=7 $\,TeV. An excess of $ B^0_s \rightarrow μ^+μ^- $ candidates with respect to the background expectations is observed with a statistical significance of 3.5 standard deviations. A branching fraction of $ { \cal BR}（B^0_s \rightarrow μ^+μ^-）=（3.2^{+1.5}_{-1.2}）\times 10^{-9} $ is measured with an unbinned maximum likelihood fit. The measured branching fraction is in agreement with the expectation from the Standard Model. The observed n…
The recent results from the LHCb in the context of $(B^+ \rightarrow K^+ l l)$ decay and the CMS analysis in the context of right handed $W$-boson ($W_R$) search show a $2.6σ$ and a $2.8σ$ deviations from the Standard Model expectations respectively. In this work, we address these two seemingly uncorrelated results in the context of \R-parity violating supersymmetry. We found that a particular combination of $LQD^c$-type operators which successfully explain the LHCb result, can also accommodate the CMS excess in the $eejj$ channel of the $W_R$ search.
Correlating LHCb B_s^0 to μ^+ μ^- Results with the ATLAS-CMS Multijet Supersymmetry Search
我们发现，无标度翻转SU（5）结构与最近的LHCb结果在B_s^0到μ^+ μ^-衰变中是透明一致的，这主要是由于在模型空间中全局强制执行的tanβ~ 20的相当小的值的抑制。这一事实应解释与证明规避质量限制的ATLAS和CMS超对称搜索和更重要的潜在解释小观察到的过量的多射流数据。最适合这些过剩的无标度翻转SU（5）基准模型的高根诺质量标度为M_{1/2} = 708 GeV，它驱动了双主导LSP的质量m_x_1^0 = 143.4 GeV，轻光阑m_t1 = 786 GeV，胶子m_g = 952 GeV，重夸克m_uL = 1490 GeV。相应地，对Br（B_s^0 to μ^+ μ^-）= 3.5 x 10^-9的罕见B衰变的总预测表明，超对称贡献可能确实比在这个框架下从标准模型中得到的预测要小得多，在最近的LHCb测量之后仍然存在的非常严格的约束区域内非常合适。
Non-leptonic charmless Bc decays and their search at LHCb
本文讨论了Bc介子衰变为两个轻介子（π，K^（*），η '，ρ，ω，φ）的过程.所有这些衰变通道都来自一种类型的图，即树湮灭。这使我们能够导出这些过程之间极其简单的SU（3）关系。湮灭贡献的大小是B物理中的一个重要问题，我们提供了两种不同的估计的情况下，非轻子的无粲Bc衰变，无论是与重轻介子的湮灭衰变或微扰模型的QCD因式分解的启发比较。最后，我们讨论了在LHCb可能的搜索这些通道。
Search for $B_c(ns)$ via the $B_c(ns)\to B_c(ms)π^+π^-$ transition at LHCb and $Z_0$ factory
有趣的是，研究整个$B_c$家族的特性，其中包含两种不同的重口味。大型强子对撞机和拟议中的$Z^0$工厂提供了一个机会，因为将实现$B_c$家族的大型数据库。$B_c$及其激发态可以通过它们的衰变模式来识别。实验者认为，$B_c^*(ns)\to B_c+γ$不容易被清楚地测量，相反，在$B_c(ns)\to B_c(ms)+π^+π^-$（$n>m$）的衰变中发生的$π^+$和$π^-$的轨迹可以被明确地识别，因此测量似乎更容易和更可靠，因此这种模式在LHCb和拟议的$Z^0$工厂的早期运行阶段更有利。本文用QCD多极展开方法计算了$B_c(ns)\to B_c(ms)+π^+π^-$的速率，数值结果表明用LHC和$Z^0$工厂的光度进行实验测量是可行的。
CP violation in charm and beauty decays at LHCb
LHCb是LHC的一个专用重味物理精密实验，通过研究非常罕见的美丽和魅力味强子的衰变以及CP破坏观测值的精密测量，寻找超越标准模型（SM）的新物理（NP）。在这篇评论中，我将介绍一个选择最近的精确测量CP违反观测的衰变的美丽和魅力味强子。这些测量是基于LHCb在2011年收集的高达$1.0 \rm{fb}^{-1}$的积分亮度。
We present the prospects of an angular analysis of the $Λ_b \to Λ(1520)\ell^+\ell^-$ decay. Using the expected yield in the current dataset collected at the LHCb experiment, as well as the foreseen ones after the LHCb upgrades, sensitivity studies are presented to determine the experimental precision on angular observables related to the lepton distribution and their potential to identify New Physics. The forward-backward lepton asymmetry at low dilepton invariant mass is particularly promising. NP scenarios favoured by the current anomalies in $b\to s\ell^+\ell^-$ decays can be distinguished …
The Run 2 data taking period of the Large Hadron Collider (LHC) at CERN in years 2015-2018 has presented a great opportunity to search for physics beyond the standard model (BSM). It will be followed by the Run 3 period starting in 2022, and by the High-Luminosity LHC (HL-LHC) era starting in late 2020s, where the latter promises an unprecedented wealth of physics prospects due to very high expected integrated luminosity and improved detector features. The ATLAS, CMS and LHCb experiments pursued a rich physics program in Run 2, and are already assessing the physics expectations at the HL-LHC e…
New physics search via CP observables in $B^0_s \rightarrow ϕϕ$ decays with left- and right-handed Chromomagnetic operators
本文通过含左右手色磁算符的 $B_s^0 \ ightarrow ϕϕ$ 时间依赖角分析提出新的 CP 破坏搜寻方案，并利用 LHCb 伪数据研究灵敏度，同时结合 Belle(II) 测量以确定新物理手征性。
B Physics in the LHC Era: Selected Topics
通过对B介子衰变的高精度测量，我们刚刚进入了对标准模型味道部分的新一轮测试。一个特别令人兴奋的方面是在LHCb上对B_s介子系统的探索。我们关注两个特别有希望的新物理探测器，它们可能为我们在LHC上的新物理提供第一个确凿的证据：在B_s^0 -> J/psi phi通道中强烈抑制的稀有衰变B_s^0-> mu^+mu^-和CP破坏效应。我们将讨论与这些测量相关的最新理论发展，并将勾勒出LHC时代B物理计划的其他亮点。
Constraining new physics with B to K* mu+ mu- in the early LHC era
我们调查的可观测量的角分布B到K* mu+ mu-确定那些适合在头几年的大型强子对撞机数据采集测量。由于实验的不确定性将占主导地位，我们专注于易于测量的可观测量，同时最大限度地提高发现的潜力。存在三个可观测量，其可通过对作为一个或两个衰减角的函数的信号事件进行计数来提取，并且对应于标准模型中的全角度分布的大特征：Afb、Fl和S5。其中两个在实验界是众所周知的，然而，我们表明，测量S5增加了物理学的互补灵敏度超出了标准模型。像Afb，它具有一个零交叉点，减少强子的不确定性，在领先的顺序和大反冲限制。我们探讨了实验的灵敏度，这一点在LHCb，并表明，它可以测量精度高，由于陡峭的S5分布。目前的实验模型独立的参数空间上的约束和预测的值的Afb和S5零交叉点。评估了LHCb测量Afb、F1和S5的相对影响，其中积分亮度为2 fb^（-1）。这些问题的探讨与一个新的模型的衰减，可以使用标准的模拟工具，如EVTGEN。
$B$ anomalies in the post $R_{K^{(*)}}$ era
本研究结合LHCb与CMS的最新测量数据，对后$R_{K^{(*)}}$时代的$b \to s \tau^+\tau^-$衰变开展模型无关分析，约束新物理的轻子味普适性，并对比不同维度新物理场景的拟合显著性。
Heavy flavour physics provides excellent opportunities to indirectly search for new physics at very high energy scales and to study hadron properties for deep understanding of the strong interaction. The LHCb experiment has been playing a leading role in the study of heavy flavour physics since the start of the LHC operations about ten years ago, and made a range of high-precision measurements and unexpected discoveries, which may have far-reaching implications on the field of particle physics. This review highlights a selection of the most influential physics results on CP violation, rare dec…
New physics search via CP observables in $B_s^0 \rightarrow ϕϕ$ decay with Chromomagnetic operators
本文通过 $B_s^0 \rightarrow \phi\phi$ 衰变中的CP破坏可观测量，利用包含左右手色磁偶极算符的新物理模型，提出新的实验搜索方案，并基于LHCb数据评估了灵敏度。
Observation in astronomy suggests that our Universe contains an abundance of matter over antimatter, which can only be explained if the combined CP symmetry is violated. Studies of CP violation have driven the flavor physics with the aim of testing the Standard Model of particle physics and searching for physics beyond. CP violation is discovered in strange, beauty and charm meson systems, however no conclusive sign of CP violation in baryon decays has been observed yet. This review summarizes CP violation studies performed by the LHCb experiment in charmless decays and rare decays of beauty b…
The LHCb detector provides accurate vertex reconstruction and hadronic particle identification, which make the experiment an ideal place to look for light long-lived particles (LLP) decaying into Standard Model (SM) hadrons. In contrast with the typical search strategy relying on energetic jets and a high multiplicity of tracks from the LLP decay, LHCb can identify LLPs in exclusive, specific hadronic final states. To illustrate the idea, we study the sensitivity of LHCb to an exotic Higgs decay $h\to SS$, followed by the displaced decay of GeV-scale scalars into charged kaons $S\to K^+K^-$. W…
New Strategy for B_s Branching Ratio Measurements and the Search for New Physics in B^0_s -> mu^+ mu^-
欧洲核子研究中心（CERN）大型强子对撞机（LHCb）实验的成功将使我们对B_s衰变的研究进入一个新的时代。B^0_s -> mu^+ mu^-是寻找“新物理学”的一个特别有希望的通道。影响这个测量的系统关键不确定性--实际上是所有B_s衰变分支比--是碎裂函数f_d/f_s的比值。由于目前可用的确定f_d/f_s的方法不足以满足LHCb的高精度要求，我们提出了一种新的策略，使用\bar B^0_s -> D ^+ pi^-和\bar B^0_d -> D^+ K^-。它使我们能够得到BR（B^0_s -> mu^+ mu^-）的一个较低的实验界限，为新物理学提供了一个强有力的探索。为了超越这个界限，并使f_d/f_s的理论精度与实验精度相匹配，只需知道SU（3）破缺对非微扰法的形状因子比的修正为20%。由于我们的策略，我们可以在LHCb上以5 σ检测到B^0_s -> mu^+ mu^-中的新物理，其分支比小到标准模型值的两倍，这表示新物理达到了当前LHCb预期的两倍。
LHCb status and early physics prospects
LHCb是LHC中b和c物理的专用探测器。我将提出一个简洁的审查的检测器设计和预期的性能，以及一些第一批结果的基础上交付的宇宙数据和粒子束的LHC在2008年夏天的不同子系统的调试。实验已经准备好利用LHC预期的第一批数据。在物理运行的第一年收集到的~0.3fb-1的积分亮度，将使LHCb能够进行许多非常重要的测量，具有揭示新物理效应的潜力，例如测量B_s混合相phi_{\Jpsiϕ}，或搜索超出CDF和D 0设定的极限的衰变B_s->mumu。
With the first data being recorded at Belle II, we are at the brink of a new era in quark flavour physics. The many exciting new opportunities for Belle~II include a full angular analysis of inclusive ${\bar B \to X_{s} \, \ell^+\ell^-}$ which has the potential to reveal new physics, in particular by its interplay with the exclusive $b \to s \ell^+\ell^-$ counterparts studied extensively at LHCb. In this paper, we present fully updated Standard Model predictions for all angular observables necessary for this endeavour. These predictions are tailored to Belle II and include an elaborate study o…
B Physics at LHCb
LHCb是LHC中用于b物理的专用探测器。在这篇文章中，我们提出了一个简洁的审查检测器的设计和性能，以及主要的物理目标和它们的相关性的精确测试的标准模型和搜索的新物理超越它。
$b\to{}s\ell\ell$ decays at LHCb
针对$B^{0}\to{}K^{\ast{}0}\mu^{+}\mu^{-}$衰变测量与标准模型预期的偏差可能源自长程贡献的问题，首次开展该衰变的振幅分析以甄别相关效应，为新物理寻找提供更可靠的实验依据。
Invited "News & Views" for the journal, SCIENCE CHINA: Physics, Mechanics & Astronomy, on a recently new search for the doubly charmed baryon $Ξ_{cc}^+$ at the LHC, which is done by the LHCb Collaboration, arXiv:1909.12273.
The direct searches for Beyond Standard Model (BSM) particles have been constraining their mass scale to the extent where it is now becoming consensual that such particles are likely to be above the energy reach of the LHC. Meanwhile, the studies of indirect probes of BSM physics, with all their diversity, have been progressing both in accurracy and in setting up observables with reduced theoretical uncertainties. The observation of flavour anomalies in $b$ hadron decays represents an important part of the program of indirect detection of BSM physics. Several benchmark analyses involving lepto…
In this talk, we briefly report the investigations of the mass spectra for the $cc\bar c\bar c, bb\bar b\bar b$, $bc\bar b\bar c$ and $cc\bar b\bar b$ tetraquark states by using the QCD moment sum rule method. The calculations for the fully-charm $cc\bar c\bar c$ tetraquarks have been successfully predicted the existence of di-$J/ψ$ resonances including $X(6900)$ in LHCb's observation. The quantum numbers for these resonance structures are also suggested. More efforts are still needed in both theoretical and experimental aspects to study the properties of these fully-heavy tetraquark states. T…
New physics search with flavour in the LHC era
本文根据B工厂和LHC的最新数据，介绍了夸克味物理的现状，并讨论了最新实验结果对MFV框架下新物理的影响。我们还展示了一些超对称性的影响的例子。
We perform a quantitative analysis of the $bb\bar{b}\bar{b}$ tetraquark decays into hidden- and open-bottom mesons and calculate, for the first time, the $bb\bar{b}\bar{b}$ tetraquark total decay width. On the basis of our results, we propose the $bb\bar{b}\bar{b} \to B^{+} B^{-} (B^0 \bar{B}^0) (B_s^0 \bar{B}_s^0) \to l^{+} l^{-}+\text{X}$ decays as the most suitable channels to observe the $bb\bar{b}\bar{b}$ tetraquark states, since the calculated two-lepton cross section upper limit, $\simeq 39 $ fb, is so large as to be potentially detectable with the 2018 LHCb sensitivity, paving the way …
Inspired by the observation of the fully-charm tetraquark $X(6900)$ state at LHCb, the production of $X(6900)$ in $\bar{p}p\rightarrow J/ψJ/ψ$ reaction is studied within an effective Lagrangian approach and Breit-Wigner formula. The numerical results show that the cross section of $X(6900)$ at the c.m. energy of 6.9 GeV is much larger than that from the background contribution. Moreover, we estimate dozens of signal events can be detected by D0 experiment, which indicates that searching for the $X(6900)$ via antiproton-proton scattering may be a very important and promising way. Therefore, rel…
Squark flavor mixing and CP asymmetry of neutral $B$ mesons at LHCb
中性$B$介子的CP破坏是寻找新物理的重要现象。D $Ø$合作组观测到的同号双μ子电荷不对称性表明了$B_s-\bar B_s$混合中CP破坏的新物理。另一方面，LHCb在$B_s^0\to J/ψϕ$和$B_s^0\to J/ψf_0(980)$中观察到CP破坏不对称性，这与SM预测一致。然而，CP破坏的新物理学仍有空间。CKMfitter已经给出了考虑LHCb数据的新物理参数的允许区域。在此基础上，我们讨论了夸克味混合对$B_d$和$B_s$介子CP破坏的影响。我们预言了非轻子衰变$B_d^0\to ϕK_S$、$B_d^0\to η'K^0$、$B_s^0\to ϕϕ$和$B_s^0\to ϕη'$的不对称性。
Feebly Interacting Particles: FIPs at LHCb
本文探讨了LHCb利用新触发器技术搜索轻量微弱相互作用粒子的可能性，并更新了相关基准参数空间。
Exploration of the LHCb $P_c$ states and possible resonances in a unitary coupled-channel model
本文在幺正耦合道模型中引入$J/ψp$道并拟合LHCb数据，动力学生成四个与隐粲五夸克态对应的$1/2^-$和$3/2^-$共振态，并给出耦合强度及更高分波中新共振态的迹象。
Direct and indirect searches for New Physics
本文综述了味物理对超对称模型的间接约束。我们特别研究了Bs -> mu+mu-和B -> K* mu+mu-的限制，强调新的LHCb结果。我们表明，这些罕见的过渡提供了有价值的信息，在寻找新的物理和补充的直接搜索。
In this paper, we describe the potential of the LHCb experiment to detect Stealth physics. This refers to dynamics beyond the Standard Model that would elude searches that focus on energetic objects or precision measurements of known processes. Stealth signatures include long-lived particles and light resonances that are produced very rarely or together with overwhelming backgrounds. We will discuss why LHCb is equipped to discover this kind of physics at the Large Hadron Collider and provide examples of well-motivated theoretical models that can be probed with great detail at the experiment.
Indirect search for New Physics: complementarity to direct searches
我们提出了一个概述的直接搜索新的物理在LHC和间接约束的味道部门之间的相互作用，强调最近的LHCb结果的影响。与希格斯粒子搜索结果的互补性也将得到解决。我们展示了超对称性中几个具体例子的背景下，不同部门之间的相关性和互补性。
Flavour data constraints on new physics and SuperIso
我们讨论了B_s -> mu+mu-和B -> K*mu+mu-衰变在间接寻找新物理中的意义，强调了LHCb的新结果。特别是，我们得出的后果的MFV假设和讨论的重要性的MFV预测。最近的LHCb测量的背景下，MSSM的影响也将得到解决，和超级ISO计划将简要介绍。
We investigate $B_sπ^+$ scattering in s-wave using lattice QCD in order to search for an exotic resonance X(5568) with flavor $\bar b s \bar d u$; such a state was recently reported by D0 but was not seen by LHCb. If X(5568) with $J^P=0^+$ exists, it can strongly decay only to $B_sπ^+$ and lies significantly below all other thresholds, which makes a lattice search for X(5568) cleaner and simpler than for other exotic candidates. Both an elastic resonance in $B_sπ^+$ as well as a deeply bound $B^+\bar K^0$ would lead to distinct signatures in the energies of lattice eigenstates, which are not s…
Search for Majorana Neutrino Signal in $B_c$ Meson Rare Decay
为了寻找Majorana中微子信号，我们研究了$B_C$介子稀有衰变.结果表明，相应的衰变率对Majorana中微子质量和混合角敏感。在LHCb中可以观察到质量区$m_π<m_n<m_B$内的马约拉纳中微子诱导的$B_C^\pm\to l_1^\pm l_2^\pm M^\mp $信号。
Beta decays in the LHC era: from ultracold neutrons to colliders
在这次演讲中，我回顾了半轻子β衰变实验的新物理学范围，以及它们与LHC搜索的相互作用。假设新粒子足够重，我们可以使用有效场论方法来分析LHC搜索，这使我们能够与低能实验进行直接和独立的比较。
We use a combination of quark-antiquark and $B^{(*)}K$ interpolating fields to predict the mass of two QCD bound states below the $B^*K$ threshold in the quantum channels $J^P=0^+$ and $1^+$. The mesons correspond to the b-quark cousins of the $D_{s0}^*(2317)$ and $D_{s1}(2460)$ and have not yet been observed in experiment, even though they are expected to be found by LHCb. In addition to these predictions, we obtain excellent agreement of the remaining p-wave energy levels with the known $B_{s1}(5830)$ and $B_{s2}^*(5840)$ mesons. The results from our first principles calculation are compared…
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