Charged lepton flavor violation (cLFV) processes, potentially important for various Beyond the Standard Model Physics scenarios are analyzed in the Standard Model Effective Field Theory (SMEFT) framework. We consider the most relevant 2 quark-2 lepton $(2q2\ell)$ operators for the leptonic and semi-leptonic LFV B-decay (LFVBD) processes $B_s\to μ^+e^- , B^+\to K^+μ^+e^-, B^0\to K^{*0}μ^+ e^-, {\rm and}~ B_s\to ϕμ^-e^+$. We analyse the interplay among the Wilson coefficients responsible for these LFVBDs and other cLFV processes like $\rm CR (μ\to e)$, $\ell_i \to \ell_j γ$, $\ell_i \to\ell_j\ell_k\ell_m$ and $Z \to \ell_i \ell_j$, to find the maximal possible LFV effects in $B$-meson decays. We probe the scale of new physics in relation to the constraints imposed by both classes of the LFV decays while considering both the present bounds and future expectations. In view of proposed experiments at LHCb-II and Belle II to study charged LFV processes, we have also provided the upper limits on the indirect constraints on such LFVBDs. For the processes where $B$ meson is decaying to $μ^{\pm}$ and $e^{\mp}$, we show that new physics can be constrained by an enhancement of 2-4 orders of magnitude on the current sensitivities of the BRs of $B^+\to K^+μ^+e^-, B^0\to K^{*0}μ^+ e^- {\rm and}~ B_s\toϕμ^{\pm}e^{\mp}$.
Indian Association for the Cultivation of Science(印度科学培养协会);Institute of Physics(物理研究所);Homi Bhabha National Institute(霍米·巴巴国立学院);Acharya Institute of Technology(阿查里亚理工学院)
Baryon-number-violating nucleon decays in SMEFT extended with a light scalar
State Key Laboratory of Nuclear Physics and Technology, Institute of Quantum Matter, South China Normal University(华南师范大学量子物质研究所核物理与技术国家重点实验室);Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, Guangdong Provincial Key Laboratory of Nuclear Science(广东省基础研究中心物质结构与基本相互作用卓越中心广东省核科学重点实验室);Sydney Consortium for Particle Physics and Cosmology, School of Physics, The University of New South Wales(新南威尔士大学物理学院悉尼粒子物理与宇宙学联盟)
Sensitivity prospects for lepton-trijet signals in the $ν$SMEFT at the LHeC
Instituto de Física de Mar del Plata (IFIMAR) CONICET, UNMDP(马德普拉塔物理研究所 (IFIMAR) 阿根廷国家科学研究委员会,马德普拉塔国立大学);Instituto de Física La Plata (IFLP) CONICET, UNLP(拉普拉塔物理研究所 (IFLP) 阿根廷国家科学研究委员会,拉普拉塔国立大学);Instituto de Física, Facultad Ingeniería, Universidad de la República(共和国大学工程学院物理研究所);Departamento de Física, Universidad Nacional de Mar del Plata(马德普拉塔国立大学物理系);Instituto de Física, Facultad de Ciencias, Universidad de la República(共和国大学理学院物理研究所)
Is the $(g-2)_μ$ anomaly a threat to Lepton Flavor Conservation?
虽然$(g-2)_μ$异常可以用只涉及μ子的新物理学(NP)来解释,但在标准模型(SM)有效场论(SMEFT)中,NP算符通常具有更一般的结构。特别地,如果想要提供几个超出SM效应的组合解释,如轻子味普适性(LFU)违反,如B异常所指示的,则需要味空间中NP算子的强对齐以满足来自具有轻子味违反(LFV)的可观测量的界限,如$μ\to e γ$。我们在带电轻子质量基下,导出了$10^{-5}$在偶极算符中味角的紧束缚。通过对SMEFT的重整化群演化(RGE)的分析,我们发现在高尺度下多个算子的不对准会破坏低尺度下的对准。特别是,它对一些4-费米子算子施加了限制。我们探讨了动力学机制以及风味对称性来解释这种风味对齐,并说明了在显式NP模型中达到它的困难。如果$(g-2)_μ$异常被证实,唯一的自然解释似乎在于单个轻子数守恒。如果SM的这种偶然对称性在SMEFT的高阶项中也存在,我们就可以得出结论,夸克和轻子扇区在SM之外的行为完全不同。本程序基于arXiv:2111.13724。
Flavorful Lepton-Number-Violating SMEFT: Loop Mixing, $0νββ$ and Rare Meson Decays
Institute of Particle and Nuclear Physics (IPNP), Faculty of Mathematics and Physics, Charles University in Prague(布拉格查理大学数学物理学院粒子与核物理研究所);Institute of Physics, Silesian University in Opava(奥帕瓦西里西亚大学物理研究所);Instituto de Física Corpuscular (IFIC), Universitat de València–CSIC(巴伦西亚大学-西班牙国家科学研究委员会粒子物理研究所);Department of Physics, University of California, Berkeley(加州大学伯克利分校物理学系)
Cartography of LNV dim-9 SMEFT: Implications for Radiative Neutrino Masses and $0νββ$
Institute of Particle and Nuclear Physics (IPNP), Faculty of Mathematics and Physics, Charles University(查尔斯大学数学物理学院粒子与核物理研究所);Institute of Physics, Silesian University in Opava(俄帕瓦西里西亚大学物理研究所);Instituto de Física Corpuscular (IFIC), Universidad de Valencia-CSIC(巴伦西亚大学-西班牙国家科学研究委员会粒子物理研究所)
Impact of dim-6 $ν$SMEFT operators on low-scale leptogenesis
KEK Theory Center, IPNS, KEK(高能加速器研究机构理论中心);Theoretical Division, Los Alamos National Laboratory(洛斯阿拉莫斯国家实验室理论部);Johannes Gutenberg-Universität Mainz(美因茨约翰内斯古腾堡大学)