Search for resonance-enhanced $CP$ and angular asymmetries in the ${\Lambda }_c^{+}\to p{\mu }^{+}{\mu }^{-}$ decay at LHCb

Abstract

The first measurement of the $CP$ asymmetry of the decay rate ($A_{CP}$) and the $CP$ average ($\Sigma A_{\text{FB}}$) and $CP$ asymmetry ($\Delta A_{\text{FB}}$) of the forward-backward asymmetry in the muon system of ${\Lambda }_c^{+}\to p{\mu }^{+}{\mu }^{-}$ decays is reported. The measurement is performed using a data sample of proton-proton collisions, recorded by the LHCb experiment from 2016 to 2018 at a center-of-mass energy of 13$\text{ TeV}$, which corresponds to an integrated luminosity of 5.4${\text{ fb}}^{-1}$. The asymmetries are measured in two regions of dimuon mass near the $\varphi$-meson mass peak. The dimuon-mass integrated results are \begin{align*} A_{CP} &= (-1.1 \pm 4.0 \pm 0.5)\%,\\ ΣA_{\text{FB}} &= (\phantom{-}3.9 \pm 4.0 \pm 0.6)\%,\\ ΔA_{\text{FB}} &= (\phantom{-}3.1 \pm 4.0 \pm 0.4)\%, \end{align*} where the first uncertainty is statistical and the second systematic. The results are consistent with the conservation of $CP$ symmetry and the Standard Model expectations.

arXiv commentAll figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/3473/ (LHCb public pages)

References in corpus (34)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• LHCb Detector Performance
• Boosted Decision Trees as an Alternative to Artificial Neural Networks for Particle Identification
• Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2
• Prospects of discovering new physics in rare charm decays
• Measurement of $CP$ asymmetry in $D^0\to K^{-}{K}^{+}$ and $D^0\to {\pi }^{-}{\pi }^{+}$ decays
• Flavor & new physics opportunities with rare charm decays into leptons
• ${\Lambda }_c\to N$ form factors from lattice QCD and phenomenology of ${\Lambda }_c\to n{\ell }^{+}{\nu }_{\ell }$ and ${\Lambda }_c\to p{\mu }^{+}{\mu }^{-}$ decays
• The LHCb upgrade I
• ReDecay: A novel approach to speed up the simulation at LHCb
• Searches for Rare or Forbidden Semileptonic Charm Decays
• Measurement of the mass difference between neutral charm-meson eigenstates
• Standard Model prediction and new physics tests for D0 -> h+h-l+l- (h=π,K; l=e,μ)
• Effects of Littlest Higgs model in rare D meson decays
• The New Physics Reach of Null Tests with $D\to \pi \ell \ell$ and $D_s\to K\ell \ell$ Decays
• Null tests from angular distributions in $D\to P_1{P}_2{l}^{+}{l}^{-}$, $l=e,\mu$ decays on and off peak
• Exploiting CP-asymmetries in rare charm decays
• Resonance catalyzed CP asymmetries in D -> P l+ l-
• Observation of $D^0$ meson decays to ${\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ final states
• On CP Asymmetries in Two-, Three- and Four-Body D Decays
• Measurement of the time-integrated $CP$ asymmetry in $D^0\to K^{-}{K}^{+}$ decays
• Theoretical and experimental status of rare charm decays
• Manifestations of Warped Extra Dimension in Rare Charm Decays and Asymmetries
• Measurement of angular and CP asymmetries in $D^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $D^0\to K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ decays
• Disentangling QCD and New Physics in $D^{+}\to {\pi }^{+}{\ell }^{+}{\ell }^{-}$
• Rare ${\Lambda }_c\to p{\ell }^{+}{\ell }^{-}$ decay in the relativistic quark model
• Angular analysis of $D^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $D^0\to K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ decays and search for $CP$ violation
• Effective field theory analysis of rare $|\Delta c|=|\Delta u|=1$ charm decays
• $S$-wave contribution to rare $D^0\to {\pi }^{+}{\pi }^{-}{\ell }^{+}{\ell }^{-}$ decays in the Standard Model and sensitivity to New Physics
• Rare ${\Lambda }_c$ decays and new physics effects
• Search for the rare decay of charmed baryon ${\Lambda }_c^{+}$ into $p{\mu }^{+}{\mu }^{-}$ final state
• Search for $D^0$ meson decays to ${\pi }^{+}{\pi }^{-}{e}^{+}{e}^{-}$ and $K^{+}{K}^{-}{e}^{+}{e}^{-}$ final states

Cited by in corpus (2)

• Implications of recent LHCb data on CPV in b-baryon four body decays
• New opportunities for rare charm from $Z\to c\bar{c}$ decays