B Physics at LHCb
Monica Pepe Altarelli, Frederic Teubert
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。
LHCb is a dedicated detector for b physics at the LHC. In this article we present a concise review of the detector design and performance together with the main physics goals and their relevance for a precise test of the Standard Model and search of New Physics beyond it.
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LHCb: detector performance and first physics results
LHCb是LHC中用于$b$和$c$物理的专用探测器。我将提出一个简洁的审查的探测器的设计和性能，以及早期的物理结果和前景的选择。在2010年收集的$37 \rm{pb}^{-1}$的积分亮度已经允许LHCb进行一些非常重要的测量，而预计2011年的数据有可能揭示$B_s $部门的新物理效应。
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。
We comment on some tensions with the Standard Model predictions in the recent LHCb data.
The new angular analysis of the decay $B \to K^* \ell^+ \ell^-$ recently presented by the LHCb Collaboration still indicates some tensions with the Standard Model predictions. There are several ongoing analyses to solve the problem of separating hadronic and New Physics effects in this decay, but the significance of the observed tensions in the angular observables in $B \to K^* μ^+μ^-$ is still dependent on a theory guesstimate of the hadronic contributions to these decays. Using the new data from LHCb we offer two tests which make a statistical comparison to determine whether the most favoure…
Despite not being designed for it, the LHCb experiment has given world-leading contributions in kaon and hyperon physics. In this contribution I review the prospects for kaon physics at LHCb exploiting the already acquired data and the current and future Upgrade scenarios.
Looking for New Physics in b-decays with LHCb
这篇文章是一个简短的和非详尽的总结的前景，以寻找新的物理与LHCb提出了在多伦多的HCP会议于2010年8月26日。
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。
Top LHCb Physics
我们建议在LHCb实验中可以研究顶级物理，并且可以观察到顶级生产。由于LHCb在前向覆盖了一个很大的赝快度区域，它具有独特的能力来探测顶部扇区的新物理。此外，我们表明，LHCb可能能够测量的t \bar t生产率不对称，从而间接探测异常的前向向后t \bar t不对称的前向区域，增强的前向-后向不对称CDF实验报告的可能性。
LHCb $\bigtriangleup A_{CP}$ of $D$ meson and R-Parity Violation
LHCb合作最近宣布了对$D\rightarrow K^+K^-$和$D \rightarrow π^+π^-$之间的时间积分CP不对称性的差异的测量。这一结果提供了$D$介子大的直接CP破坏的证据，并揭示了一些重要的新物理意义。结果表明，R宇称破缺超对称性能增强$D$介子的直接CP破坏，而抑制$K$和$B$介子的CP破坏，这与以前的实验结果一致.模型参数的约束条件和一些后果也进行了讨论。
We present a Bayesian analysis of the implications for new physics in semileptonic $b\to s$ transitions after including new measurements of $R_K$ at LHCb and new determinations of $R_{K^*}$ and $R_{K^{*+}}$ at Belle. We perform global fits with 1, 2, 4, and 8 input Wilson coefficients, plus one CKM nuisance parameter to take into account uncertainties that are not factorizable. We infer the 68% and 95.4% credibility regions of the marginalized posterior probability density for all scenarios and perform comparisons of models in pairs by calculating the Bayes factor given a common data set. We t…
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…
We present the current status of the comparisons with the respective data of the predictions of our approach of exact amplitude-based resummation in quantum field theory as applied to precision QCD calculations as needed for LHC physics. The agreement between the theoretical predictions and the data exhibited continues to be encouraging.
We analyse the new physics implications of theoretically clean $b \to s$ observables in a model-independent approach and compare their coherence with the implications of other rare $B$-decays. A statistical comparison is done between the New Physics explanation and hadronic contributions as the source of the anomalies in angular observables of the $B\to K^*μμ$ decay. We make projections for future measurements that indicate that LHCb will be in the position to discover lepton non-universality via a single observable using the Run 3 data. The global fit of rare $B$-decays is given within a mult…
On the LHCb anomaly in B -> K* l+ l-
稀有衰变B -> K* mu+ mu-的最新LHCb角分析显示，在3.7 sigma水平上与SM存在一些差异。对这些异常有一个一致的新物理解释，同时也有理由认为这些异常只是统计涨落和/或低估强子不确定性的直接后果。我们简要地讨论了各种假设的可能交叉检查，并根据B工厂Babar和Belle收集的数据以及SuperBelle未来的机会分析了包容性B -> Xs l+ l。我们还提出了一个全球性的最新LHCb数据的假设下，最小的味道违规的分析。后者是新物理模型的重要基准情景。任何超出MFV界限和关系的测量都明确地表明，在标准模型的汤川耦合旁边存在新的味道结构。然而，如果新的物理是负责这些差异，我们表明它是兼容的MFV假设，所以没有新的风味结构是必要的。此外，我们分析了基于蒙特卡罗研究的观测量之间的相关性的影响。
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.
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.
Flavour Physics at LHCb -- 50 years of the KM paradigm
本文回顾 KM 范式提出 50 年来 LHCb 在味物理中的高精度 KM 矩阵测量，讨论确定理论参数或发现其局限的现状。
The LHCb experiment is designed to study properties and decays of heavy flavored hadrons produced from $pp$ collisions at the LHC. During Run~1, it has recorded the world's largest data sample of beauty and charm hadrons, enabling precision spectroscopy studies of such particles. Several important results obtained by LHCb, such as the discovery of the first pentaquark states and the first unambiguous determination of the $Z_c(4430)^-$ as an exotic state, have dramatically increased the interest on spectroscopy of heavy hadrons. An overview of the latest LHCb results on the subject, including t…
First minimum bias physics results at LHCb
我们报告的LHCb实验的第一次测量，从$pp$碰撞在$\sqrt{s} = 0.9$ TeV和7 TeV记录使用最小偏置触发。特别是测量的绝对$K^0_S$生产截面在$\sqrt{s} = 0.9$ TeV和$\barΛ/Λ$的比例都在$\sqrt{s} = 0.9$ TeV和7 TeV进行了讨论，并提出了初步的结果。
Exotic Hadrons at LHCb
本文综述了LHCb探测器五年间在奇特强子谱学上的重大发现及相关唯象学解释，并探讨了2024年升级后该项目在奇特强子物理领域的研究潜力。
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。
New physics search in the LHCb era
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。
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。
A range of flavour physics observables show tensions with their corresponding Standard Model expectations: measurements of leptonic flavour-changing neutral current processes and ratios of semi-leptonic branching fractions involving different generations of leptons show deviations of the order of four standard deviations. If confirmed, either would be an intriguing sign of new physics. In this manuscript, we analyse the current experimental situation of such processes and for the first time estimate the combined impact of the future datasets of the Belle II and LHCb experiments on the present …
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。
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…
LHCb potential to discover long-lived new physics particles with lifetimes above 100 ps
本文提出利用 LHCb 的新型 Downstream 算法重建无顶点探测器击中信息的径迹，证明其可成为寿命前沿实验，并在多种长寿命粒子模型中达到与主 LHC 外拟建实验相当的灵敏度。
Time dependent measurements of the CKM angle Gamma at LHCb
大型强子对撞机的启动开辟了许多新的前沿，在精确的味道物理学，特别是扩展领域的精确时间依赖CP破坏测量的$B^0_s$系统。这篇文章回顾了在大型强子对撞机的专用味道物理实验，LHCb的CKM角$γ$的时间依赖性测量的状态。特别注意的是$γ$的测量从衰减模式\DsK，一个理论上干净和精确的方法，这是唯一的LHCb。LHCb探测器的性能，这种模式和相关模式的审查，在早期的数据采集，发现接近标称模拟性能，并在2011年这些测量的前景简要触及。
New Physics in B-Bbar mixing in the light of recent LHCb data
我们进行独立于模型的统计分析的三个方案，容纳新物理（NP）在三角洲F=2变味中性电流振幅。在B_d-B_d-bar和B_s-B_s-bar中的NP不相关的情况下，我们发现代表标准模型的参数点被2.4个标准差所不利。然而，最近关于B_s中性介子混合的LHCb数据禁止对半轻子CP不对称性A_SL的D 0数据进行很好的调节。我们引入第四种情况，NP在M_12^d，s和Gamma_12^d，s中，它可以容纳所有数据。我们讨论了这种可能性的可行性，并强调了在半轻子B_d和B_s衰变中分别测量CP不对称性的重要性。所有结果都是使用CKMfitter分析软件包获得的，该软件包采用频率统计方法，并使用Rfit处理理论不确定性。
The LHCb experiment measured the time-dependent CP asymmetries $C_{KK}$ and $S_{KK}$ in $B_s\to K^+K^-$ decay. Combining with the corresponding CP asymmetries $C_{ππ}$ and $S_{ππ}$ in $B\to π^+π^-$ decay, we find that the size of $U$-spin breaking in this system is of order $20\%$. Moreover, the data suggest that these effects are dominated by factorizable contributions. We further study the constraints on new physics contributions to $b\to u\bar uq$ ($q=s,d$). New physics that is minimally flavor violating (MFV) cannot be distinguished from the Standard Model (SM) in these decays. However, ne…
$b\to{}s\ell\ell$ 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。
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.
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…
We study an extended Standard Model with a gauged U(1)$^{\prime}$ flavor symmetry, motivated not only by the fermion mass hierarchy but also by the excesses in $B \to K^{(*)} l l$ reported by the LHCb collaborations. The U(1)$^{\prime}$ charges are assigned to quarks and leptons in a flavor-dependent manner, and flavored Higgs doublets are also introduced in order to detail the Yukawa couplings at the renormalizable level. Then, the fermion mass hierarchy is realized by the vacuum alignment of the Higgs doublets. In this model, flavor-changing currents involving the gauge boson of U(1)$^{\prim…
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 LHC is the new b-hadron factory and will be dominating flavour physics until the start of Belle II, and beyond in many decay modes. While the $B$ factories and Tevatron experiments are still analysing their data, ATLAS, CMS and LHCb are producing interesting new results in CP violation and rare decays, that set strong constraints on models beyond that SM and exhibit some discrepancies with the SM predictions. The LHCb collaboration used the LHC 50 ns ramp-up period of July 2015 to measure the double-differential $J/ψ$, $J/ψ$-from-$b$-hadron and charm cross-sections at $\sqrt{s} = 13$ TeV. …
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。
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。
A concise review on some Higgs-related new physics models in light of current experiments
本文简要评述了低能超对称、小希格斯、双希格斯二重态及单重态扩展等希格斯相关新物理模型，重点分析它们解释缪子g-2、W玻色子质量与暗物质的能力，并讨论单重态扩展中的宇宙相变、暗物质遗迹密度和真空稳定性。
Over the last few years LHCb with present energies found some discrepancies in $b\to s\ell^+\ell^-$ FCNC transitions including anomalies in the angular observables of $B\to K^*μ^+μ^-$, particularly in $P_5^\prime$, in low dimuon mass region. Recently, these anomalies are confirmed by Belle, CMS and ATLAS. As the direct evidence of physics beyond-the-SM is absent so far, therefore, these anomalies are being interpreted as indirect hint of new physics. In this context, we study the implication of non universal family of $Z^\prime$ model to the angular observables $P_{1,2,3}$, $P^{\prime}_{4,5,6}…
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