Searching and identifying leptoquarks through low-energy polarized scattering processes $e^{-}p\to e^{-}{\Lambda }_c$

Abstract

We investigate the potential for searching and identifying the leptoquark (LQ) effects in the charm sector through the low-energy polarized scattering processes ${\vec{e}}^{-}p\to e^{-}{\Lambda }_c$, $e^{-}\vec{p}\to e^{-}{\Lambda }_c$, and ${\vec{e}}^{-}\vec{p}\to e^{-}{\Lambda }_c$. Considering only the longitudinally polarized processes, we show that the different LQ models can be disentangled from each other by measuring the four spin asymmetries, $A_L^e$, $A_L^p$, $A_{L3}^{ep}$, and $A_{L6}^{ep}$, constructed in terms of the polarized cross sections. Although it is challenging to accomplish the same goal with transversely polarized processes, we find that investing them in future experiments is especially beneficial, since they can directly probe into the imaginary part of the Wilson coefficients in the general low-energy effective Lagrangian. With our properly designed experimental setups, it is also demonstrated that promising event rates can be expected for all these processes and, even in the worst-case scenario -- no LQ signals are observed at all, they can still provide a competitive potential for constraining the new physics, compared with those from the conventional charmed-hadron weak decays and the high-$p_T$ dilepton invariant mass tails at high-energy colliders.

arXiv comment24 pages, 11 tables, and 7 figures; more discussions and references added, final version published in the journal

References in corpus (91)

• The anomalous magnetic moment of the muon in the Standard Model
• Physics of leptoquarks in precision experiments and at particle colliders
• The COMPASS Experiment at CERN
• B-physics anomalies: a guide to combined explanations
• One Leptoquark to Rule Them All: A Minimal Explanation for $R_{D^{(\ast )}}$, $R_K$ and $(g-2{)}_{\mu }$
• The theory and phenomenology of polarized deep inelastic scattering
• Model independent constraints on leptoquarks from rare processes
• Model-independent description of $B\to \pi l\nu$ decays and a determination of $|V_{ub}|$
• Simultaneous Explanation of $R(D^{(\ast )})$ and $b\to s{\mu }^{+}{\mu }^{-}$: The Last Scalar Leptoquarks Standing
• Anomalies in $B$-decays and $U(2)$ flavour symmetry
• Search for a new gauge boson in the $A^{\prime }$ Experiment (APEX)
• Spin Structure of the Proton from Polarized Inclusive Deep-Inelastic Muon-Proton Scattering
• Closing the window on single leptoquark solutions to the $B$-physics anomalies
• Baryon Number and Lepton Universality Violation in Leptoquark and Diquark Models
• Leptoquark model to explain the $B$-physics anomalies, $R_K$ and $R_D$
• Rare Charm Decays in the Standard Model and Beyond
• Scalar leptoquarks from GUT to accommodate the $B$-physics anomalies
• Review of Lepton Universality tests in B decays
• Search for resonant and nonresonant new phenomena in high-mass dilepton final states at $\sqrt{s}=$ 13 TeV
• Renormalization-group evolution of new physics contributions to (semi)leptonic meson decays
• The Leptoquark Hunter's Guide: Pair Production
• On the single leptoquark solutions to the $B$-physics anomalies
• Unification without supersymmetry: neutrino mass, proton decay and light leptoquarks
• Reading the footprints of the B-meson flavor anomalies
• A Comprehensive Study of Leptoquark Bounds
• B physics Beyond the Standard Model at One Loop: Complete Renormalization Group Evolution below the Electroweak Scale
• Measurements of absolute hadronic branching fractions of ${\Lambda }_c^{+}$ baryon
• An Electron Fixed Target Experiment to Search for a New Vector Boson A' Decaying to e+e-
• Excesses of muon $g-2$, $R_{D^{(\ast )}}$, and $R_K$ in a leptoquark model
• Revisiting the vector leptoquark explanation of the B-physics anomalies
• Towards a unified explanation of $R_{D^{(\ast )}}$, $R_K$ and $(g-2{)}_{\mu }$ anomalies in a left-right model with leptoquarks
• Constraints on two-lepton, two quark operators
• Form Factors for Lambda_b -> Lambda Transitions in SCET
• Combined Explanations of the $b\to s{\mu }^{+}{\mu }^{-}$ and $b\to c{\tau }^{-}\bar{\nu }$ Anomalies: a General Model Analysis
• Phenomenology of scalar leptoquarks
• Low-energy signatures of the ${\mathrm{PS}}^3$ model: from $B$-physics anomalies to LFV
• Prospects of discovering new physics in rare charm decays
• Beta decays as sensitive probes of lepton flavor universality
• Flavor & new physics opportunities with rare charm decays into leptons
• Low-energy phenomenology of scalar leptoquarks at one-loop accuracy
• Explaining the $R_K$ and $R_{D^{(\ast )}}$ anomalies with vector leptoquarks
• Simple derivation of general Fierz-type identities
• Constraints on scalar leptoquarks from lepton and kaon physics
• New Precision Limit on the Strange Vector Form Factors of the Proton
• One Leptoquark to unify them? Neutrino masses and unification in the light of $(g-2{)}_{\mu }$, $R_{D^{(\star )}}$ and $R_K$ anomalies
• The Leptoquark Hunter's Guide: Large Coupling
• Measurement of the Branching Fraction Br(Lambda_c+ -> p K- pi+)
• Searches for scalar leptoquarks in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• $B$ Flavour Anomalies: 2021 Theoretical Status Report
• ${\Lambda }_c\to N$ form factors from lattice QCD and phenomenology of ${\Lambda }_c\to n{\ell }^{+}{\nu }_{\ell }$ and ${\Lambda }_c\to p{\mu }^{+}{\mu }^{-}$ decays
• Addressing $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$, muon $g-2$ and ANITA anomalies in a minimal $R$-parity violating supersymmetric framework
• Unified Framework for $B$-Anomalies, Muon $g-2$, and Neutrino Masses
• Charm Physics Confronts High-$p_T$ Lepton Tails
• Searches for Rare or Forbidden Semileptonic Charm Decays
• Semitauonic $b$-hadron decays: A lepton flavor universality laboratory
• Leptoquarks meet ${\epsilon }^{\prime }/\epsilon$ and rare Kaon processes
• Combined explanations of $(g-2{)}_{\mu }$, $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ anomalies in a two-loop radiative neutrino mass model
• On $D\to X_u{l}^{+}{l}^{-}$ within the Standard Model and Frameworks like the Littlest Higgs Model with T Parity
• Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Combined Constraints on First Generation Leptoquarks
• Lepton Flavor Violation and Dilepton Tails at the LHC
• Standard Model prediction and new physics tests for D0 -> h+h-l+l- (h=π,K; l=e,μ)
• A Minimal Explanation of Flavour Anomalies: B-Meson Decays, Muon Magnetic Moment, and the Cabibbo Angle
• Bounds on Vector Leptoquarks
• Search for leptoquarks coupled to third-generation quarks in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• The New Physics Reach of Null Tests with $D\to \pi \ell \ell$ and $D_s\to K\ell \ell$ Decays
• Flavor Anomalies in Heavy Quark Decays
• Null tests from angular distributions in $D\to P_1{P}_2{l}^{+}{l}^{-}$, $l=e,\mu$ decays on and off peak
• Search for leptonic decays of D0 mesons
• Search for the lepton-flavour violating decay $D^0\to e^{\pm }{\mu }^{\mp }$
• Rare charm $\mathbf{c}\to \mathbf{u}\mathbf{\nu }\bar{\mathbf{\nu }}$ dineutrino null tests for ${\mathbf{e}}^{+}{\mathbf{e}}^{-}$-machines
• Model independent New Physics analysis in ${\Lambda }_b\to \Lambda {\mu }^{+}{\mu }^{-}$ decay
• Theoretical and experimental status of rare charm decays
• From B-meson anomalies to Kaon physics with scalar leptoquarks
• Searching for heavy leptoquarks at a muon collider
• Coloured Scalars Mediated Rare Charm Meson Decays to Invisible Fermions
• Processes that break baryon number by two units and the Majorana nature of the neutrino
• Weak production of strange and charm ground-state baryons in nuclei
• Rare ${\Lambda }_c\to p{\ell }^{+}{\ell }^{-}$ decay in the relativistic quark model
• A comparative study of the $S_1$ and $U_1$ leptoquark effects in the light quark regime
• Distinguishing Leptoquarks at the LHC/FCC
• Lepton flavor non-universality in the B-sector: a global analyses of various new physics models
• Exploring leptoquark effects in hyperon and kaon decays with missing energy
• Exploring charm decays with missing energy in leptoquark models
• Pinning down $|\Delta c|=|\Delta u|=1$ couplings with rare charm baryon decays
• Search for lepton-flavor violating decays $D^0\to X^0{e}^{\pm }{\mu }^{\mp }$
• Physics with CEBAF at 12 GeV and Future Opportunities
• Hunting for Contact Interactions at HERA with polarized lepton and proton beams
• Prospects for discovering new physics in charm sector through low-energy scattering processes $e^{-}p\to e^{-}({\mu }^{-}){\Lambda }_c$
• Search and identification of Scalar and Vector Leptoquarks at HERA with polarization
• A flavor-inspired radiative neutrino mass model