Precision measurement of the $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ cross section near threshold

Abstract

The Born cross section of the $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ process is measured with unprecedented precision using data collected with the BESIII detector at $\sqrt{s}=4574.5$, $45580.0$, $4590.0$ and $4599.5$ $\mathrm{MeV}$. The non-zero cross section near the ${\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ production threshold is discerned. At center-of-mass energies $\sqrt{s}=4574.5$ and $4599.5$ $\mathrm{MeV}$, the higher statistics data enable us to measure the ${\Lambda }_c$ polar angle distributions. From these, the ratio between the ${\Lambda }_c$ electric and magnetic form factors ($|G_E/G_M|$) is measured for the first time. They are found to be $1.14\pm 0.14\pm 0.07$ and $1.23\pm 0.05\pm 0.03$ respectively, where the first uncertainties are statistical and the second are systematic.

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• Measurement of the center-of-mass energies at BESIII via the di-muon process
• Observation of a cross-section enhancement near mass threshold in $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$
• Measurement of the proton form factor by studying $e^{+}{e}^{-}\to p\bar{p}$
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• Luminosity measurements for the R scan experiment at BESIII
• On the strong energy dependence of the e^+e^- to ppbar amplitude near threshold
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• Tuning and validation of hadronic event generator for $R$ value measurements in the tau-charm region
• Measurement of Singly Cabibbo Suppressed Decays ${\Lambda }_c^{+}\to p{\pi }^{+}{\pi }^{-}$ and ${\Lambda }_c^{+}\to p{K}^{+}{K}^{-}$
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• The BESIII Physics Programme
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• Measurement of the Energy-Dependent Electromagnetic Form Factors of a Charmed Baryon
• Measurement of cross-section for $e^{+}{e}^{-}\to {\Xi }^{-}{\bar{\Xi }}^{+}$ near threshold at BESIII
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• Measurements of Weak Decay Asymmetries of ${\Lambda }_c^{+}\to p{K}_S^0$, $\Lambda {\pi }^{+}$, ${\Sigma }^{+}{\pi }^0$, and ${\Sigma }^0{\pi }^{+}$
• Electromagnetic Transition Form Factors of Baryon Resonances
• Are the $Y$ states around 4.6 GeV from $e^{+}{e}^{-}$ annihilation higher charmonia?
• Observation of a vector charmoniumlike state in $e^{+}{e}^{-}\to D_s^{+}{D}_{s1}(2536{)}^{-}+c.c.$
• Hyperon electromagnetic timelike elastic form factors at large $q^2$
• Re-examining the $X(4630)$ resonance in the reaction $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$
• Probing the internal structure of baryons
• Direct CP violation in beauty and charm hadron decays
• Discussions on the Line-shape of $X(4660)$ Resonance
• Electromagnetic form factors of spin 1/2 doubly charmed baryons
• Vector mesons and electromagnetic form factor of the $\Lambda$ hyperon
• A possible explanation of the threshold enhancement in the process $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$
• Observation of a near-threshold enhancement in the $\Lambda \bar{\Lambda }$ mass spectrum from $e^{+}{e}^{-}\to \varphi \Lambda \bar{\Lambda }$ at $\sqrt{s}$ from 3.51 to 4.60 GeV
• Measurement of the absolute branching fractions of ${\Lambda }_c^{+}\to \Lambda \eta {\pi }^{+}$ and $\Sigma (1385{)}^{+}\eta$
• $N\bar{N}$ production in $e^{+}{e}^{-}$ annihilation near the threshold revisited
• Prospects for CP & P violation in ${\Lambda }_c^{+}$ decay at STCF
• Study of $e^{+}{e}^{-}\to {\Omega }^{-}{\bar{\Omega }}^{+}$ at center-of-mass energies from 3.49 to 3.67 GeV
• First Measurement of the Decay Asymmetry in the pure W-boson-exchange Decay ${\Lambda }_c^{+}\to {\Xi }^0{K}^{+}$
• Toy model to understand oscillatory behavior in timelike nucleon form factors
• New insights into the oscillation of the nucleon electromagnetic form factors
• Global coupled-channel analysis of $e^{+}{e}^{-}\to c\bar{c}$ processes in $\sqrt{s}=3.75-4.7$ GeV
• Production and decay of polarized hyperon-antihyperon pairs
• Measurement of the cross section of $e^{+}{e}^{-}\to {\Xi }^{-}{\bar{\Xi }}^{+}$ at center-of-mass energies between 3.510 and 4.843 GeV
• Possible ${\Lambda }_c{\bar{\Lambda }}_c$ molecular states and their productions in nulceon-antinulceon collision
• Final-state interaction in the process $e^{+}{e}^{-}\to {\Lambda }_c{\bar{\Lambda }}_c$
• Observation of ${\Lambda }_c^{+}\to \Lambda a_0(980{)}^{+}$ and Evidence for $\Sigma (1380{)}^{+}$ in ${\Lambda }_c^{+}\to \Lambda {\pi }^{+}\eta$
• $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$ cross sections and the ${\Lambda }_c^{+}$ electromagnetic form factors within the extended vector meson dominance model
• Natural explanation of recent results on $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$
• Study of the $B^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}{K}^{-}$ decay
• The electromagnetic form factors of ${\Lambda }_c$ hyperon in the vector meson dominance model
• Evidence of the Singly Cabibbo Suppressed decay ${\Lambda }_c^{+}\to p{\pi }^0$
• Production of $D^{(\ast )}{\bar{D}}^{(\ast )}$ near the thresholds in $e^{+}{e}^{-}$ annihilation
• Near-threshold resonance in $e^{+}{e}^{-}\to {\Lambda }_c{\bar{\Lambda }}_c$ process
• Tetraquark molecular states in the $D_s{\bar{D}}_{s1}$ and $D_s^{\ast }{\bar{D}}_{s0}^{\ast }$ mass spectrum
• Malaria Parasitic Detection using a New Deep Boosted and Ensemble Learning Framework
• The electromagnetic form factors and spin polarization of ${\Lambda }_c^{+}$ in the process $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c^{-}$
• Measurements of Born Cross Sections for $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c(2595{)}^{-}+c.c.$ and $e^{+}{e}^{-}\to {\Lambda }_c^{+}{\bar{\Lambda }}_c(2625{)}^{-}+c.c.$ at $\sqrt{s}=$4918.0 and 4950.9 MeV
• Measurement of Born cross section of $e^{+}{e}^{-}\to {\Sigma }^0{\bar{\Sigma }}^0$ at $\sqrt{s}=3.50-4.95$ GeV
• Charmonium decays into ${\Lambda }_c{\bar{\Lambda }}_c$ pair governed by the hadronic loop mechanism
• Measurement of the absolute branching fraction of the three-body decay ${\Lambda }_c^{+}\to {\Xi }^0{K}^{+}{\pi }^0$ and search for ${\Lambda }_c^{+}\to n{K}^{+}{\pi }^0$, ${\Sigma }^0{K}^{+}{\pi }^0$ and $\Lambda K^{+}{\pi }^0$
• Measurement of Hadronic Cross Sections at BESIII