Tootfinder

Weak decays of singly heavy baryons: the $1/2\to3/2$ case
Fu-Wei Zhang, Zhen-Xing Zhao
https://arxiv.org/abs/2508.13648 https://arxiv.org/pdf/2508.13648

Weak decays of singly heavy baryons: the $1/2\to3/2$ case
This work is devoted to investigating the $1/2\to3/2$ weak decays of singly heavy baryons. Due to the orthogonality between the spin wavefunctions of antitriplet baryons and spin-3/2 baryons, the weak decay amplitude for such processes vanishes at the leading order of QCD. Consequently, this study exclusively examines the weak decays of $Ω_{Q}$. Using the light-front approach under the three-quark picture, we first extract the relevant form factors, and then apply them to investigate correspon…

Missing baryons recovered: a measurement of the gas fraction in galaxies and groups with the kinematic Sunyaev-Zel'dovich effect and CMB lensing
Boryana Hadzhiyska, Simone Ferraro, Gerrit S. Farren, Noah Sailer, Rongpu Zhou
https://arxiv.org/abs/2507.14136

Missing baryons recovered: a measurement of the gas fraction in galaxies and groups with the kinematic Sunyaev-Zel'dovich effect and CMB lensing
We present new constraints on the halo masses and matter density profiles of DESI galaxy groups by cross-correlating samples of Luminous Red Galaxies (LRGs) and Bright Galaxy Survey (BGS) galaxies with the publicly available CMB lensing convergence map from ACT DR6. This provides an independent, lensing-based calibration of halo masses, complementary to methods relying on clustering or dynamics. We derive constraints on the mean halo mass for three DESI-selected samples, finding $\log(M_{\rm ha…

Observation of charge–parity symmetry breaking in baryon decays: #universe.

Leading vector coupling in baryon semileptonic decays in large-$N_c$ chiral perturbation theory revisited: Extension to decuplet baryons
Ruben Flores-Mendieta, Guillermo Sanchez-Almanza
https://arxiv.org/abs/2507.15069

Leading vector coupling in baryon semileptonic decays in large-$N_c$ chiral perturbation theory revisited: Extension to decuplet baryons
The leading vector coupling defined in the semileptonic decay of a baryon is revisited in the framework of large-$N_c$ baryon chiral perturbation. Aspects of $SU(3)$ flavor symmetry breaking are taken into account in two ways: Explicitly through perturbative symmetry breaking and implicitly through the integrals occurring in the one-loop corrections. The analysis of perturbative breaking is performed by using flavor projection operators which are exceptionally helpful in understanding previousl…

Timelike electromagnetic form factors of hyperons at large $q^2$
G. Ramalho, M. T. Pe\~na, K. Tsushima, Myung-Ki Cheoun
https://arxiv.org/abs/2507.15248 ht…

Timelike electromagnetic form factors of hyperons at large $q^2$
In the last few years there has been considerable progress in the study of the electromagnetic form factors of baryons in the timelike region, through electron-positron scattering, with increasing square transfer momentum $q^2$. The modulus of the electric ($G_E$) and magnetic ($G_M$) form factors has been measured for nucleons, hyperons and other baryons at BaBar, CLEO, Belle and BESIII. The novel measurements motivated the extension of a covariant quark model, developed to the spacelike regio…

Accelerating Universe without dark energy: matter creation after DESI DR2
Sauvik Bhattacharjee, Sudip Halder, Jaume de Haro, Supriya Pan, Emmanuel N. Saridakis
https://arxiv.org/abs/2507.15575

Accelerating Universe without dark energy: matter creation after DESI DR2
We investigate the cosmological matter creation scenario, an alternative approach to both dark energy and modified gravity theories, after the recent DESI DR2-BAO release. We consider that the total matter sector consists of three independently evolving components, namely, radiation, baryons, and dark matter, with the latter being governed by an adiabatic matter creation process that leads to a modified continuity equation. Due to the violation of the standard conservation law, a creation press…

Unified Spectroscopic Study of Bottom Mesons and Doubly Bottom Baryons Using a Relativistic Flux-Tube Model
Pooja Jakhad, Ajay Kumar Rai
https://arxiv.org/abs/2509.14699 https:/…

Unified Spectroscopic Study of Bottom Mesons and Doubly Bottom Baryons Using a Relativistic Flux-Tube Model
Using the relativistic flux tube (RFT) model with spin-dependent corrections, we present a unified investigation of the mass spectra for singly bottom mesons ($B$, $B_s$) and doubly bottom baryons ($Ξ_{bb}$, $Ω_{bb}$). Within this framework, the calculated masses for established $B$ and $B_s$ meson states show excellent agreement with experimental data. Leveraging these reliable predictions for low-lying states, we propose spectroscopic assignments for several higher excitations: we identify …

$\Xi_c(3055)$ as a scaling point to establish the excited $\Xi_c^{(\prime)}$ family
Xiao-Huang Hu, Zhe-Tao Miao, Zi-Xuan Ma, Qi Huang, Yue Tan, Jia-Lun Ping
https://arxiv.org/abs/2509.15765

$Ξ_c(3055)$ as a scaling point to establish the excited $Ξ_c^{(\prime)}$ family
Mass spectra and decay properties of the low-lying orbital excited $Ξ_c^{(\prime)}$ baryons are investigated in the framework of the chiral quark model and quark pair creation mechanism, which are mainly based on the recently experimental fact that $Ξ_c(3055)$ is a $D$-wave state excited in $λ$-mode. As a result, we make an inference that, (i) $Ξ_{c}(2790)$ and $Ξ_{c}(2815)$ are likely to be $λ$-mode excited $Ξ_{c1}(\frac{1}{2}^{-},1P)$ and $Ξ_{c1}(\frac{3}{2}^{-},1P)$ states, respectiv…

Doubly heavy spin-$\frac {3}{2} $ baryons spectrum in the ground and excited states
M. Shekari Tousi, K. Azizi
https://arxiv.org/abs/2508.10328 https://arx…

Doubly heavy spin-$\frac {3}{2} $ baryons spectrum in the ground and excited states
This study employs QCD sum rules to predict the masses and residues of spin-$\frac {3}{2} $ doubly heavy baryons including two heavy quarks (c and/or b) and one light quark, specifically focusing on $ Ξ_{cc}^*$, $ Ξ_{bc}^*$, $ Ξ_{bb}^*$, $ Ω_{cc}^*$, $ Ω_{bc}^*$ and $ Ω_{bb}^*$. Our study provides results for the ground state ($1S$), first orbital excitation ($1P$), and the first radial excitation ($2S$), within a consistent theoretical framework. In addition to mass spectra, we provide r…

Cabibbo-suppressed charged-current semileptonic decays of $\Xi_b$ baryons
Zhou Rui, Zhi-Tian Zou, Ya Li, Ying Li
https://arxiv.org/abs/2509.12566 https://a…

Cabibbo-suppressed charged-current semileptonic decays of $Ξ_b$ baryons
We present the first perturbative QCD calculations of the $Ξ_b \to (Λ, Σ)$ transition form factors at leading order in $α_s$, which govern the Cabibbo-suppressed semileptonic decays $Ξ_b \to (Λ, Σ)\ell ν_\ell$ with $\ell = e, μ, τ$. Using these form factors, we evaluate differential and integrated branching fractions and angular observables within the helicity formalism. The branching ratios are predicted to be of order $10^{-4}$ for $Σ$ final states and $10^{-5}$ for $Λ$ final stat…