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Alex Gilman

Publications and source records attributed to Alex Gilman.

7 recordsLinked to original sources
arXiv2026

Recent results on (semi)-leptonic $D$ decays and charm baryons at BESIII

The BESIII collaboration has collected the world's largest datasets at the energy thresholds for producing a variety of open-charm hadrons. Most recently, the BESIII collaboration has collected datasets that significantly increase the number of $D^0$, $D^+$, and $\Lambda_c^+$ hadrons for analysis, further improving on previous datasets collected by BESIII. These proceedings highlight recent results that leverage these datasets to study the pure leptonic and semileptonic decays of these hadrons, as well as study the polarization of baryon pairs produced in electron-positron collisions.

hep-ex↗
arXiv2026

Quantum correlation of neutral charmed mesons at BESIII

BESIII has recently accumulated a large data sample near the $\psi(3770)$ production threshold corresponding to an integrated luminosity of $20\text{ fb}^{-1}$. Neutral $D^0\bar{D}^0$ pairs produced at the $\psi(3770)$ are in a $C$-odd correlated state, providing a unique laboratory to measure the strong-phase differences between $D^0$ and $\bar{D}^0$ decays. These parameters are essential inputs to the study of CP violation in heavy-flavor physics, primarily in the determinations of the CKM angle gamma and charm-mixing parameters. These proceedings report new measurements of strong-phase differences in different neutral $D$ decays at BESIII, including new measurements of the strong phases in $D\to K^+K^-\pi^+\pi^-$ decays. Additionally reported is the first observation of correlated $DD$ pairs produced at $e^+e^-$ center-of-mass energies above the $\psi(3770)$ threshold, where $e^+e^-\to D^{*}\bar{D}$ and $e^+e^-\to D^{*}\bar{D}^{*}$ processes also occur. These processes produce both $C$-odd and $C$-even correlated $D^0\bar{D}^0$ pairs, which allow for new measurement techniques to determine strong-phases from previously unused datasets.

hep-ex↗
arXiv2026

Time-integrated CP asymmetries in meson and baryon decays

Measurements of CP asymmetries in hadron decays integrated over time provide access to direct CP violation, which arises from differences between the amplitudes of CP-conjugate decay processes. These proceedings present an overview of recent measurements from the LHCb and Belle II experiments, including progress on the determination of the CKM angle $\gamma$, the first observation of CP violation in baryon decays, and new studies of direct CP violation in $D$ mesons. The outlook for measurements with datasets whose collection is underway is also discussed.

hep-ex↗
arXiv2024

Charming Darwin: the evolution of QCD parameters across different species

We explore the prospects of measurements of spectral moments of inclusive charm decays with BESIII. The rich and uniquely clean data set of charm mesons and baryons at BESIII offers a unique laboratory to study the evolution of Heavy Quark Expansion (HQE) parameters across different charm hadron species and to shed light on the interplay between heavy quark dynamics and light quark effects. The HQE in terms of inverse powers of the heavy meson mass is well-established in beauty decays, however due to the lighter charm mass its applicability to charm remains an open question. To date no determination of the HQE parameters, the kinetic energy, chromomagnetic moment and Darwin terms, has been attempted. A particularly important role here is given to the Darwin and weak annihilation operators, whose values are important to predict lifetimes of heavy hadrons. Using a fast simulation for the BESIII detector response and predictions for spectral moments, we investigate the sensitivity to HQE parameters with today's and possible future data sets. In addition, we discuss the theory challenges for the HQE in charm and the experimental limitations. We further investigate the sensitivity of determining the CKM matrix element $|V_{cs}|$ with inclusive semileptonic charm decays.

hep-ex↗
arXiv2024

Handling correlated systematic uncertainties on the CKM angle gamma

The current precision on the CKM angle $\gamma$ is driven by averages of measurements from multiple final states and multiple experiments. As the next generation of experiments targets a total experimental precision on $\gamma$ less than one degree, systematic uncertainties must be well-controlled and correlated uncertainties between different final states and across experiments must be fully understood. These proceedings examine the systematic uncertainties that arise in direct measurements of $\gamma$ and discuss the potential of each class of systematic uncertainties to prevent sub-degree precision.

hep-ex↗
arXiv2019

Peter-Weyl bases, preferred deformations, and Schur-Weyl duality

We discuss the deformed function algebra of a simply connected reductive Lie group G over the complex numbers using a basis consisting of matrix elements of finite dimensional representations. This leads to a preferred deformation, meaning one where the structure constants of comultiplication are unchanged. The structure constants of multiplication are controlled by quantum 3j symbols. We then discuss connections earlier work on preferred deformations that involved Schur-Weyl duality.

math.QA↗