Searcharxiv⌕ Search
Home/Archive/arXiv

arXiv · 0706.2163

Predictions for masses of Xi_b baryons

Marek Karliner·Boaz Keren-Zur·Harry J. Lipkin·Jonathan L. Rosner
View original source ↗Read source document ↗Export metadata ↓

Abstract

The recent observation by CDF of Sigma_b^{+-} (uub and ddb) baryons within 2 MeV of the predicted Sigma_b - Lambda_b splitting has provided strong confirmation for the theoretical approach based on modeling the color hyperfine interaction. We now apply this approach to predict the masses of the Xi_b family of baryons with quark content usb and dsb - the ground state Xi_b at 5790 to 5800 MeV, and the excited states Xi_b^' and Xi_b^*. The main source of uncertainty is the method used to estimate the mass difference m_b - m_c from known hadrons. We verify that corrections due to the details of the interquark potential and to Xi_b-Xi_b^' mixing are small.

Explore related subjects

hep-phhep-ex

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Marek Karliner, Boaz Keren-Zur, Harry J. Lipkin, Jonathan L. Rosner. 2007-06-23. Predictions for masses of Xi_b baryons. https://arxiv.org/abs/0706.2163

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Dominant Thermal Resonant Mechanism for Low-Scale Leptogenesis

We explicitly demonstrate the importance of a new thermal resonant channel in the context of low-scale leptogenesis, which goes beyond the well-known mixing and oscillation of massive sterile neutrinos. This new channel is always present when considering the thermally-induced Higgs decay to leptons and relativistic sterile neutrinos, and can become dominant thanks to lepton-doublet flavour coherences being resonantly enhanced in thermal plasma. This mechanism, which we call Thermally Induced Resonant Leptogenesis (TIRL), can yield the observed baryon asymmetry in our universe. No resonant enhancement from quasi-degenerate sterile neutrinos is required, providing distinction between TIRL and other known low-scale leptogenesis scenarios. The active-to-sterile neutrino mixing can be also probed in fixed-target and long-lived particle experiments and by displaced vertex searches at high-energy colliders.

hep-ph↗
arXiv2026

Nucleon decays into one lepton plus two nonstrange mesons

Nucleon decays into a lepton and two pseudoscalar mesons represent key channels for probing baryon number violation, complementing conventional two-body modes. In this paper, we model-independently correlate two- and three-body processes within the framework of low-energy effective field theory, performing a global analysis that avoids single-operator-dominance assumption. We derive significantly improved bounds on 15 three-body modes with a lepton ($e^+,\,μ^+,\hatν=ν/\barν$) and two nonstrange mesons ($π,η$). For charged-lepton modes, our indirect lower limits on the partial lifetimes ($Γ^{-1}$) are more stringent than current Particle Data Group (PDG) values by more than three orders of magnitude. For five (anti)neutrino modes, we establish for the first time $Γ^{-1}\gtrsim 10^{34}\,\rm yr$. Additionally, our analysis improves constraints on two-body processes $n\to e^+π^-$, $n\to μ^+π^-$, and $p\to \hatνπ^+$ by approximately a factor of 2 compared to the PDG limits. These results highlight the importance of leveraging correlations among different processes to better probe new physics, enabling more stringent constraints on experimentally challenging processes from well-measured ones.

hep-ph↗
arXiv2026

Power of Axion Microwave Absorbed by Quantum Hall State in Haloscope

We propose a new method for detecting dark matter axions using a resonant cavity coupled to a two-dimensional electron system in the quantum Hall regime. When the cavity is tuned to the axion frequency, the axion-induced electromagnetic field is resonantly enhanced and drives a transverse Hall current in the quantum Hall system. On a quantum Hall plateau, the longitudinal dissipative response is strongly suppressed, $\mathrm{Re}(σ_{xx})\simeq0$, while the Hall conductivity remains finite and quantized, $\mathrm{Re}(σ_{xy})=νe^2/h$. Consequently, the Hall current is essentially nondissipative and introduces only a small additional loss to the cavity, allowing the loaded quality factor to approach the unloaded value, $Q_L\simeq Q_0$. The resulting Hall current is therefore enhanced by the large cavity quality factor, $I_H\propto\mathrm{Re}(σ_{xy})E\propto Q_L$. For a 2D electron density of $3\times10^{11}\mathrm{cm}^{-2}$, filling factor $ν=1$, and $Q_L\sim10^5$--$10^6$, we estimate a Hall current of order $I_H\sim10^{-13}$--$10^{-12}\mathrm{A}$ for an axion mass $m_a\sim10^{-5}\mathrm{eV}$ and a magnetic field $\sim 5\times 10^4\mathrm{G}$. The current is more enhanced by increasing the size of 2D electrons keeping the strength of magnetic field. Under the assumed thermal-noise level and readout conditions, the estimated Hall-current signal can achieve a signal-to-noise ratio greater than unity for an observation time of order $100\mathrm{s}$. The proposed method exploits the unique combination of a finite, quantized transverse response and a strongly suppressed longitudinal dissipation in the quantum Hall state, providing an alternative to conventional metallic-antenna detection in axion haloscopes.

hep-ph↗