Model independent analysis of New Physics effects on $B_c \to (D_s,\,D^{\ast}_s)\,μ^+μ^-$ decay observables

新物理在 $B_{c}\to D_{s}^{\ast}(\to D_{s}γ,(D_{s}π))\ell^{+}\ell^{-}$ 衰变角分布中的足迹

Footprints of New Physics in the angular distribution of $B_{c}\to D_{s}^{\ast}(\to D_{s}γ,(D_{s}π))\ell^{+}\ell^{-}$ decays

本文研究了 $B_{c}\to D^{\ast}_{s}$ 四重衰变的角分布，利用模型无关有效哈密顿量构建角观测量，评估了最新新物理场景的影响，并给出了标准模型与新物理下多种观测量的预测，为未来高能对撞机澄清 $b\to s\ell\ell$ 衰变的新物理结构提供了补充数据。

通过半轻子 $B_{c}^+\to D^{\ast+}\ell^{+}\ell^{-}$ 衰变观测量寻找新物理

Search for New Physics through the Observables of Semileptonic $B_{c}^+\to D^{\ast+}\ell^{+}\ell^{-}$ Decay

本文通过模型无关方法研究稀有半轻子衰变 $B_c^+\to D^{\ast+}\ell^{+}\ell^{-}$，分析微分分支比、前后不对称性等观测量对新物理的敏感性，发现该衰变可作为新物理的互补探针。

Explaining the $B_{d(s)} \rightarrow K^{(\ast)}\bar{K}^{(\ast)}$ puzzle via chiral-flip in $R$-parity violating MSSM with seesaw mechanism

We study the non-leptonic puzzle of $B_{d(s)} \rightarrow K^{(\ast)}\bar{K}^{(\ast)}$ decay in the $R$-parity violating minimal supersymmetric standard model (RPV-MSSM) extended with the inverse seesaw mechanism. In this model, the chiral flip of sneutrinos can contribute to the observables $L_{K\bar{K}}$ and $L_{K^{\ast}\bar{K}^{\ast}}$, that is benefit for explaining the relevant puzzle. We also find that this unique effect can engage in the $B_s$-$\bar{B}_s$ mixing. We utilize the scenario of complex $λ^\prime$ couplings to fulfill the recent stringent constraint of $B_s$-$\bar{B}_s$ mixing…

通过不同的 $B_c\to D_s^{(\ast)} \\,\ell^+\ell^-$ 观测量探索 $b\to s\\,\ell^+\ell^-$ 跃迁中的新物理

Exploring New Physics in transition $b\to s\,\ell^+\ell^-$ through different $B_c\to D_s^{(\ast)} \,\ell^+\ell^-$ observables

本文通过计算B_c→D_s^(∗)ℓ^+ℓ^-衰变的分支比、螺旋度分数、前后不对称性及轻子普适性比率等观测量，探索b→sℓ^+ℓ^-跃迁中的新物理，并区分不同新物理情景。

通过 $B_s \to K^{\ast}(\to K π)μ^{+}μ^{-}$ 衰变的可观测量研究新物理

Investigating New Physics through the Observables of Semileptonic $B_{s}\to K^{\ast}(\to K π)μ^{+}μ^{-}$ Decay

本文基于 $B_s \to K^{\ast}(\to K π)μ^{+}μ^{-}$ 衰变，利用弱有效场论框架，计算了多个关键物理可观测量，并探讨了新物理对这些可观测量的影响，揭示了与标准模型预测的显著差异。

Supersymmetric Dark Matter candidates in light of constraints from collider and astroparticle observables

The Standard Model of particle physics has been strengthened by the recent discovery of the long-awaited Higgs boson. The standard cosmological model has met the challenge of the high precision observations in cosmology and astroparticle physics. However these two standard models face both several theoretical issues, such as the naturalness problem in the Higgs sector of the Standard Model, as well as observational issues, in particular the fact that an unknown kind of matter called Dark Matter accounts for the majority of the matter content in our Universe. Attempts to solve such problems hav…

Model independent analysis of $b \to (c,\,u)\,τν$ leptonic and semileptonic decays

Latest measurement of the ratio of branching ratios $R_D = \mathcal B(B \to D\,τ\,ν)/\mathcal B(B \to D\,l\,ν)$ and $R_{D^{\ast}} = \mathcal B(B \to D^{\ast}\,τ\,ν)/\mathcal B(B \to D^{\ast}\,l\,ν)$, where $l$ is either an electron or muon, differs from the standard model expectation by $1.9σ$ and $3.3σ$, respectively. Similar tension has been observed in purely leptonic $B \to τν$ decays as well. In this context, we consider the most general effective Lagrangian in the presence of new physics and perform a model independent analysis to explore various new physics couplings. Motivated by the r…

Possible Astrophysical Observables of Quantum Gravity Effects near Black Holes

Recent implications of results from quantum information theory applied to black holes has led to the confusing conclusions that requires either abandoning the equivalence principle (e.g. the firewall picture), or the no-hair theorem (e.g. the fuzzball picture), or even more unpalatable options. The recent discovery of a pulsar orbiting a black hole opens up new possibilities for tests of theories of gravity. We examine possible observational effects of semiclassical quantum gravity in the vicinity of black holes, as probed by pulsars and event horizon telescope imaging of flares. Pulsar radiat…

精密缪子相关观测量作为约束新物理模型的工具

Precision Muon-Related Observables as a Tool to Constrain New Physics Models

提出精密缪子观测量，利用LEP的Z玻色子极点测量约束新物理，影响解决g-2反常和暗物质候选的模型。

New Strategies to Obtain Insights into CP Violation Through $B_s\to D_s^{\pm}K^\mp, D_s^{\ast\pm}K^\mp, ...$ and $B_d\to D^{\pm}π^\mp, D^{\ast\pm}π^\mp, ...$ Decays

Decays of the kind $B_s\to D_s^{\pm}K^\mp, D_s^{\ast\pm}K^\mp, ...$ and $B_d\to D^{\pm}π^\mp, D^{\ast\pm}π^\mp, ...$ allow us to probe $ϕ_s+γ$ and $ϕ_d+γ$, respectively, involving the angle $γ$ of the unitarity triangle and the $B^0_q$--$\bar B^0_q$ mixing phases $ϕ_q$ ($q\in\{d,s\}$). Analysing these modes in a phase-convention-independent way, we find that their mixing-induced observables are affected by a subtle $(-1)^L$ factor, where $L$ denotes the angular momentum of the $B_q$ decay products, and derive bounds on $ϕ_q+γ$. Moreover, we emphasize that ``untagged'' rates are an important in…

Searching for New Physics with Flavor Violating Observables

In this talk, I review the status and prospects of several low energy flavor observables that are highly sensitive to New Physics effects. In particular I discuss the implications for possible New Physics in b --> s transitions coming from the recent experimental results on the B_s mixing phase, the branching ratio of the rare decay B_s --> mu+mu-, and angular observables in the B --> K* mu+mu- decay. Also the recent evidence for direct CP violation in singly Cabibbo suppressed charm decays and its interpretation in the context of New Physics models is briefly discussed.

New physics reach of CP violating observables in the decay B to K* l+ l-

We discuss theoretical and experimental preparations for an indirect new physics search using the rare decay B to K*0 (to K pi) l+ l- focusing on CP violating observables. The separation of new physics effects and hadronic uncertainties is the key issue when using flavour observables in a new-physics search. Our analysis is based on QCD factorization and soft-collinear effective theory and critically examines the new physics reach of those observables via a detailed error analysis due to scale dependences, form factors, and other input parameters; we also explore the experimental sensitivities…

Sensitivity of Low-Energy Parity-Violation To New Physics

I review the new physics sensitivity of low-energy parity-violating (PV) observables. I concentrate on signatures of new tree-level physics in atomic PV with a single isotope, ratios of atomic PV observables, and PV electron scattering. In addition to comparing the new physics sensitivities of these observables with those of high-energy colliders, I also discuss the theoretical issues involved in the extraction of new physics limits from low-energy PV observables.

Polarized tops from new physics: signals and observables

Top quarks may be produced in large numbers in association with new physics at the LHC. The polarization of these top quarks probes the chiral structure of the new physics. We discuss several kinematic distributions which are sensitive to the polarization of single top quarks and can be used without full event reconstruction. For collimated tops we construct polarization-sensitive observables for both hadronic and leptonic decay modes and plot their distributions. We compute the observable polarization signals from top quarks produced in the on-shell cascade decay of a stop squark into a top q…

Observable n - anti-n Oscillations with New Physics at LHC

We explore extensions of the MSSM in which TeV scale vector-like multiplets can mediate observable n-anti-n oscillations, without causing conflict with the proton decay experiments, with a U(1) symmetry playing an important role. The colored vector-like particles, in particular, may be found at the LHC through some decay modes arising from their direct couplings to quarks.

Two charged strangeonium-like structures observable in the $Y(2175) \to ϕ(1020)π^{+} π^{-}$ process

Via the Initial Single Pion Emission (ISPE) mechanism, we study the $ϕ(1020)π^{+}$ invariant mass spectrum distribution of $Y(2175) \to ϕ(1020)π^{+} π^{-}$. Our calculation indicates there exist a sharp peak structure ($Z_{s1}^+$) close to the $K\bar{K}^\ast$ threshold and a broad structure ($Z_{s2}^+$) near the $K^\ast\bar{K}^\ast$ threshold. In addition, we also investigate the $ϕ(1680) \to ϕ(1020)π^{+} π^{-}$ process due to the ISPE mechanism, where a sharp peak around the $K\bar{K}^\ast$ threshold appears in the $ϕ(1020)π^{+}$ invariant mass spectrum distribution. We suggest to carry out t…

Interplay of Electroweak Precision Observables and B Physics Observables

Indirect information about the possible scale of supersymmetry (SUSY) breaking is provided by B physics observables (BPO) as well as electroweak precision observables (EWPO). We review the combination of the constraints imposed by recent measurements of the BPO BR(b -> s gamma), BR(B_s -> mu+ mu-), BR(B_u -> tau nu_tau) and Delta M_{B_s} with those obtained from the experimental measurements of the EWPO M_W, sin^2 theta_eff, Gamma_Z, (g-2)_mu and M_h. We perform a chi^2 fit to the parameters of the constrained minimal supersymmetric extension of the Standard Model (CMSSM), in which the SUSY-br…

Non-diagonal flavour observables in B and Collider Physics

Until now the focus within the direct search for supersymmetry has mainly been on flavour diagonal observables. Recently lepton flavour violating signals at future electron positron colliders have been studied. There is now an opportunity to analyse the relations between collider observables and low-energy observables in the hadronic sector. In a first work in this direction, we study flavour violation in the squark decays of the second and third generations taking into account results from B physics, in particular from the rare decay b ->s gamma. Correlations between various squark decay mode…

$B\to K^\ast_2(1430)\ell^+\ell^-$ distributions in Standard Model at large recoil

We study the rare decay $B\to K_2^\ast(1430)(\to Kπ)\ell^+\ell^-$ in the Standard Model and beyond. Working in the transversity basis, we exploit the relations between the heavy-to-light form factors in the limit of heavy quark ($m_b\to \infty$) and large energy ($E_{K_2^\ast}\to \infty$) of the $K^\ast_2$ meson. This allows us to construct observables where at leading order in $Λ_{\rm QCD}/m_b$ and $α_s$ the form factor dependence involving the $B\to K^\ast_2$ transitions cancels. Higher order corrections are systematically incorporated in the numerical analysis. In the Standard Model the dec…

Probing Neutrino Flavor Transition Mechanism with Ultra High Energy Astrophysical Neutrinos

Observation of ultra-high energy astrophysical neutrinos and identification of their flavors have been proposed for future neutrino telescopes. The flavor ratio of astrophysical neutrinos observed on the Earth depends on both the initial flavor ratio at the source and flavor transitions taking place during propagations of these neutrinos. The flavor transition mechanisms are well-classified with our model-independent parametrization. We find a new parameter R=ϕ_e/(ϕ_μ + ϕ_τ) can probe directly the flavor transition in the framework of our model-independent parametrization, without the assumpti…

在模型无关情形与轻子夸克模型中重新研究半轻衰变 $B\to D^{(\ast)}τ\barν_τ$

Reinvestigating the semileptonic $B\to D^{(\ast)}τ\barν_τ$ decays in the model independent scenarios and leptoquark models

本文利用Belle数据与格点QCD联合拟合的形状因子，结合最新实验数据对新物理威尔逊系数进行全局拟合，并在模型无关情形和三种轻子夸克模型中对 $R_{D^{(\ast)}}$、极化量及角系数等可观测量作出预言。

$D^{\ast}$ polarization vs. $R_{D^{(\ast)}}$ anomalies in the leptoquark models

Polarization measurements in $\bar{B} \to D^{(\ast)} τ\overlineν$ are useful to check consistency in new physics explanations for the $R_{D}$ and $R_{D^{\ast}}$ anomalies. In this paper, we investigate the $D^{\ast}$ and $τ$ polarizations and focus on the new physics contributions to the fraction of a longitudinal $D^{\ast}$ polarization ($F_{L}^{D^{\ast}}$), which is recently measured by the Belle collaboration $F_{L}^{D^{\ast}} = 0.60 \pm 0.09$, in model-independent manner and in each single leptoquark model (${\rm R}_2$, ${\rm S}_1$ and ${\rm U}_1$) that can naturally explain the $R_{D^{(\a…

在LHCb上对$B\to D^{\ast}\mu\nu$衰变中CP破坏进行精密测量

Towards the precision measurement of CP violation in $B\to D^{\ast}μν$ decays at LHCb

本文提出一种模型无关方法，在LHCb上通过$B\to D^{\ast}\mu\nu$衰变测量宇称和$CP$奇观测量，以抵消宇称偶项及理论不确定性，并通过赝实验评估了灵敏度与系统效应控制方案。

New Physics constraints from optimized observables in B -> K*ll at large recoil

B -> K*ll angular observables have become a key ingredient in global model-independent analyses of b->s transitions. However, as experimental precision improves, the use of theoretically clean quantities becomes a crucial issue. Global analyses that use clean observables integrated in small bins are already a reality, opening up a new chapter in our quest for New Physics.

Angular distributions of $\bar B \to D^{(\ast)}\ell\bar ν_\ell$ decays and search of New Physics

We derive the expressions for the full angular distributions of $\bar B\to D\ell\bar ν_\ell$ and $\bar B\to D^{\ast }\ell\bar ν_\ell$ decays and discuss the spectra on each angle separately. The coefficient functions, depending on helicity amplitudes, can then be combined in an ensemble of observables which can then be used to check for the presence of New Physics. We examine the sensitivity of each of these observables on the presence of non-Standard Model interaction terms at low energies. The expressions presented here are general and can be used for studying any other semileptonic pseudosc…

Beyond the Standard Model of Physics with Astronomical Observations

There has been significant recent progress in observational cosmology. This, in turn, has provided an unprecedented picture of the early universe and its evolution. In this review I will present a (biased) view of how one can use these observational results to constraint fundamental physics and in particular physics beyond the standard model.

Testing BSM physics through correlations between flavor observables

I provide an overview of the connections between flavor violating observables in the K and B meson systems beyond the Standard Model (BSM). Model independent correlations, both in and beyond the MFV framework, as well as results obtained in specific models are discussed.

Working Group Report on the "TeV Particle Astrophysics and Physics Beyond the Standard Model"

This working group focused mainly on the complementarity among particle physics and astrophysics. The analysis of data from both fields will better constrain theoretical models. Much of the discussion focused on detecting dark matter and susy particles, and on the potential of neutrino and gamma-ray astrophysics for seeking or constraining new physics.