L. M. Gu
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View article: Step-Audio 2 Technical Report
Step-Audio 2 Technical Report Open
This paper presents Step-Audio 2, an end-to-end multi-modal large language model designed for industry-strength audio understanding and speech conversation. By integrating a latent audio encoder and reasoning-centric reinforcement learning…
Step-Audio-AQAA: a Fully End-to-End Expressive Large Audio Language Model Open
Large Audio-Language Models (LALMs) have significantly advanced intelligent human-computer interaction, yet their reliance on text-based outputs limits their ability to generate natural speech responses directly, hindering seamless audio i…
View article: Step-Audio: Unified Understanding and Generation in Intelligent Speech Interaction
Step-Audio: Unified Understanding and Generation in Intelligent Speech Interaction Open
Real-time speech interaction, serving as a fundamental interface for human-machine collaboration, holds immense potential. However, current open-source models face limitations such as high costs in voice data collection, weakness in dynami…
View article: Observation of the Electromagnetic Dalitz Transition $h_c \rightarrow e^+e^-η_c$
Observation of the Electromagnetic Dalitz Transition $h_c \rightarrow e^+e^-η_c$ Open
Using $(27.12\pm 0.14)\times10^8$ $ψ(3686)$ decays and data samples of $e^+e^-$ collisions with $\sqrt{s}$ from 4.130 to 4.780~GeV collected with the BESIII detector, we report the first observation of the electromagnetic Dalitz transition…
View article: Observation of *
Observation of * Open
Using data taken at 29 center-of-mass energies between 4.16 and 4.70 GeV with the BESIII detector at the Beijing Electron Positron Collider corresponding to a total integrated luminosity of approximately 18.8 , the process is observed for …
View article: Observation of $e^+e^- \to p p \bar{p} \bar{n} π^{-} + c.c.$
Observation of $e^+e^- \to p p \bar{p} \bar{n} π^{-} + c.c.$ Open
Using data taken at 29 center-of-mass energies between 4.16 and 4.70 GeV with the BESIII detector at the Beijing Electron Positron Collider corresponding to a total integrated luminosity of approximately 18.8 $\rm fb^{-1}$, the process $e^…
View article: Measurements of the absolute branching fractions of hadronic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>D</mml:mi></mml:math>-meson decays involving kaons and pions
Measurements of the absolute branching fractions of hadronic -meson decays involving kaons and pions Open
By analyzing an electron-positron collision data sample corresponding to an integrated luminosity of 2.93 fb-1 taken at the center-of-mass energy of 3.773 GeV with the BESIII detector, we obtain for the first time the absolute branching fr…
View article: Measurement of $e^{+}e^{-}\rightarrowπ^{+}π^{-}D^{+}D^{-}$ cross sections at center-of-mass energies from 4.190 to 4.946 GeV
Measurement of $e^{+}e^{-}\rightarrowπ^{+}π^{-}D^{+}D^{-}$ cross sections at center-of-mass energies from 4.190 to 4.946 GeV Open
Using data samples collected with the BESIII detector operating at the BEPCII storage ring, we measure the cross sections of the $e^{+}e^{-}\rightarrowπ^{+}π^{-}D^{+}D^{-}$ process at center-of-mass energies from 4.190 to 4.946 GeV with a …
Luminosities and energies of e <sup>+</sup> e <sup>−</sup> collision data taken between =4.61 GeV and 4.95 GeV at BESIII* Open
From December 2019 to June 2021, the BESIII experiment collected approximately 5.85 fb −1 of data at center-of-mass energies between 4.61 and 4.95 GeV. This is the highest collision energy BEPCII has reached to date. The accumulated annihi…
View article: Amplitude analysis and branching fraction measurement of $$ {D}_s^{+} $$ → K−K+π+π+π−
Amplitude analysis and branching fraction measurement of $$ {D}_s^{+} $$ → K−K+π+π+π− Open
A bstract Using e + e − annihilation data corresponding to a total integrated luminosity of 6 . 32 fb − 1 collected at the center-of-mass energies between 4.178 and 4.226 GeV with the BESIII detector, we perform an amplitude analysis of th…
Amplitude analysis and branching fraction measurement of the decay \boldmath $D_{s}^{+} \to K^+π^{+}π^{-}π^{0}$ Open
The singly Cabibbo-suppressed decay $D_{s}^{+} \to K^+π^{+}π^{-}π^{0}$ is observed, using a data set corresponding to an integrated luminosity of 6.32 $\rm fb^{-1}$ recorded by the BESIII detector at the centre-of-mass energies between 4.1…
View article: Search for new hadronic decays of hc and observation of hc → $$ p\overline{p}\eta $$
Search for new hadronic decays of hc and observation of hc → $$ p\overline{p}\eta $$ Open
A bstract A search for the hadronic decays of the h c meson to the final states $$ p\overline{p} $$ π + π − π 0 , $$ p\overline{p}\eta $$ , and $$ p\overline{p} $$ π 0 via the process ψ (3686) → π 0 h c is performed using (4 . 48 ± 0 . 03)…
View article: Observation of the $Y(4230)$ and a new structure in $e^+e^- \rightarrow K^+K^-J/ψ$
Observation of the $Y(4230)$ and a new structure in $e^+e^- \rightarrow K^+K^-J/ψ$ Open
The cross sections of $e^+e^- \rightarrow K^+K^-J/ψ$ at center-of-mass energies from 4.127 to 4.600~GeV are measured based on 15.6 fb$^{-1}$ data collected with the BESIII detector operating at the BEPCII storage ring. Two resonant structu…
View article: Amplitude analysis and branching-fraction measurement of $$ {\mathrm{D}}_{\mathrm{s}}^{+} $$ → π+π0η′
Amplitude analysis and branching-fraction measurement of $$ {\mathrm{D}}_{\mathrm{s}}^{+} $$ → π+π0η′ Open
A bstract Using data collected with the BESIII detector in e + e − collisions at center-of-mass energies between 4.178 and 4.226 GeV and corresponding to 6.32 fb − 1 of integrated luminosity, we report the amplitude analysis and branching-…
View article: Number of J/ψ events at BESIII *
Number of J/ψ events at BESIII * Open
Using inclusive decays of , a precise determination of the number of events collected with the BESIII detector was performed. For the two data sets taken in 2009 and 2012, the numbers of events were recalculated to be and , respectively; t…
View article: Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV
Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV Open
The integrated luminosities of the data samples collected in the BESIII experiment in 2016--2017 at center-of-mass energies between 4.19 and 4.28 GeV are measured with a precision better than 1% by analyzing large-angle Bhabha scattering e…
View article: Search for the decay $h_c\rightarrowπ^0J/ψ$
Search for the decay $h_c\rightarrowπ^0J/ψ$ Open
A search for the decay $h_c\rightarrowπ^0J/ψ$ is performed using a sample of $h_c$ produced in the reaction $e^+e^-\rightarrowπ^+π^-h_c$. The data samples were collected with the BESIII detector at center-of-mass energies between 4.189 and…
View article: Oscillating features in the electromagnetic structure of the neutron
Oscillating features in the electromagnetic structure of the neutron Open
The complicated structure of the neutron cannot be calculated using first-principles calculations due to the large colour charge of quarks and the self-interaction of gluons. Its simplest structure observables are the electromagnetic form …
View article: Study of light scalar mesons through $D_s^+ \to π^0 π^0 e^+ ν_e$ and $K_S^0 K_S^0 e^+ ν_e$ decays
Study of light scalar mesons through $D_s^+ \to π^0 π^0 e^+ ν_e$ and $K_S^0 K_S^0 e^+ ν_e$ decays Open
Using 6.32~fb$^{-1}$ of $e^+e^-$ collision data recorded by the BESIII detector at center-of-mass energies between $4.178$ to $4.226$ GeV, we present the first measurement of the decay $D_s^+\to f_0(980)e^+ν_e,\,f_0(980)\to π^0π^0$. The pr…
View article: Observation of the doubly Cabibbo-Suppressed decays $D^+\to K^+π^0π^0$ and $D^+\to K^+π^0η$
Observation of the doubly Cabibbo-Suppressed decays $D^+\to K^+π^0π^0$ and $D^+\to K^+π^0η$ Open
By analyzing $e^+e^-$ annihilation data corresponding to an integrated luminosity of $2.93\,\rm fb^{-1}$ collected at the center-of-mass energy of 3.773\,GeV with the BESIII detector, we report the first observations of the doubly Cabibbo-…
View article: Search for Invisible Decays of the $\Lambda$ Baryon
Search for Invisible Decays of the $\Lambda$ Baryon Open
A search for invisible decays of the Λ baryon is carried out in the process J/ψ→ΛΛ ̄ based on (1.0087±0.0044)×1010 J/ψ events collected with the BESIII detector located at the BEPCII storage ring. No signals are found for the invisible deca…