论文标题
在$λ_b\ toλ（\ topπ^ - ）\ ell^+\ ell^ - $ nipper^ - 通过模型独立方法探测新物理效果
Probing new physics effects in $Λ_b \to Λ(\to pπ^-)\ell^+\ell^-$ decay via model independent approach
论文作者
论文摘要
The New Physics (NP) effects are studied in the rare baryonic decay $Λ_b \to Λ(\to pπ^-)\ell^{+}\ell^{-}$, with unpolarized $Λ_b$ using most general model independent approach by introducing new axial(vector), (pseudo)scalar and tensor operators in the weak effective Hamiltonian corresponding to $b\to S $过渡。最近，以$λ_b\ \至λ（\ topπ^ - ）μ^{+}μ^{ - } $衰减的LHCB协作测量了分支比（D \ Mathcal {b}/ds）$，lepton-和lepton-和hadron-side tofforn-side tofforn-side-side-side-side asmemties $ a________________ $ a_ {fb}^λ$，分别在低和高回路区域中的纵向极化分数$ f_l $。要查看新的$ va $，$ sp $和$ t $耦合是否可以容纳这些可观察物的可用实验数据，首先，我们检查了它们对这些可观察物的影响，后来我们已经检查了这些新耦合的烙印，却没有衡量的可观察力。已经发现，与$ va $相比，$ sp $耦合有利于所有四个可观察到的实验数据，但仍然没有单独的耦合能够同时容纳所有可用的数据。为了实现这一目标，采用新的WC来检查它们的范围，同时满足$ b $ - 物理的约束和可用的LHCB数据，并在$ d \ Mathcal {b}/ds $，$ f_l $，$ a_ {fb}^{fb}^{\ ell} $和$ a_和$ a__ {fb} $ nide decred for for for bins for bins for bins for bins for bins for bins上。我们发现，大多数可用数据可以通过$ va $和$ sp $ wcs的不同对来容纳，从而对这些WC的参数空间产生了更严重的约束，这些限制仍然对$ b $ - 物理学数据感到满意。
The New Physics (NP) effects are studied in the rare baryonic decay $Λ_b \to Λ(\to pπ^-)\ell^{+}\ell^{-}$, with unpolarized $Λ_b$ using most general model independent approach by introducing new axial(vector), (pseudo)scalar and tensor operators in the weak effective Hamiltonian corresponding to $b\to s$ transitions. Recently, for $Λ_b \to Λ(\to pπ^-)μ^{+}μ^{-}$ decay the LHCb collaboration has measured the branching ratio $(d\mathcal{B}/ds)$, lepton- and hadron-side forward-backward asymmetries, denoted by $A_{FB}^{\ell}$ and $A_{FB}^Λ$, respectively, and the longitudinal polarization fraction $F_L$ both in the low- and high-recoil regions. To see whether the new $VA$, $SP$ and $T$ couplings can accommodate the available experimental data of these observables, first we have examined their influence on these observables and later we have checked the imprints of these new couplings on a number of interesting but yet not measured observables. It is found that compared to the $VA$ the $SP$ couplings favor experimental data for all the four observables but still no individual coupling is able to accommodate all of the available data simultaneously. To achieve this goal, the pairs of new WCs are taken to check their range that simultaneously satisfy constraints of $B$-Physics and available LHCb data on $d\mathcal{B}/ds$, $F_L$, $A_{FB}^{\ell}$ and $A_{FB}^Λ$ in several bins for the decay channel under consideration. We find that most of the available data could be accommodated by the different pairs of $VA$ and $SP$ WCs giving more severe constraints on the parametric space of these WCs that is still satisfied with the $B$-physics data.
