2024-07-02 08:27 |
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2024-06-28 13:13 |
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2024-06-24 10:01 |
[PUBDB-2024-04838]
Preprint
Abreu, H. ; Mansour, E. A. ; Antel, C. ; et al
The FASER detector
[CERN-FASER-2022-001; arXiv:2207.11427]
FASER, the ForwArd Search ExpeRiment, is an experimentdedicated to searching for light, extremely weakly-interactingparticles at CERN's Large Hadron Collider (LHC). Such particlesmay be produced in the very forward direction of the LHC'shigh-energy collisions and then decay to visible particles insidethe FASER detector, which is placed 480 m downstream of the ATLASinteraction point, aligned with the beam collisions axis. [...]
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2024-06-21 11:58 |
[PUBDB-2024-04819]
Preprint
Aielli, G. ; Alimena, J. ; Beacham, J. ; et al
Technical design report for the CODEX-beta demonstrator
[arXiv:2406.12880]
The CODEX-$\beta$ apparatus is a demonstrator for the proposed future CODEX-b experiment, a long-lived-particle detector foreseen for operation at IP8 during HL-LHC data-taking. The demonstrator project, intended to collect data in 2025, is described, with a particular focus on the design, construction, and installation of the new apparatus..
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2024-06-20 11:28 |
[PUBDB-2024-04809]
Preprint
Adachi, I. ; Aggarwal, L. ; Aihara, H. ; et al
Measurements of the branching fractions of $\Xi_{c}^{0}\to\Xi^{0}\pi^{0}$, $\Xi_{c}^{0}\to\Xi^{0}\eta$, and $\Xi_{c}^{0}\to\Xi^{0}\eta^{\prime}$ and asymmetry parameter of $\Xi_{c}^{0}\to\Xi^{0}\pi^{0}$
[Belle II Preprint 2024-015; KEK Preprint 2024-9; arXiv:2406.04642]
We present a study of $\Xi_{c}^{0}\to\Xi^{0}\pi^{0}$, $\Xi_{c}^{0}\to\Xi^{0}\eta$, and $\Xi_{c}^{0}\to\Xi^{0}\eta^{\prime}$ decays using the Belle and Belle~II data samples, which have integrated luminosities of 980~$\mathrm{fb}^{-1}$ and 426~$\mathrm{fb}^{-1}$, respectively. We measure the following relative branching fractions $${\cal B}(\Xi_{c}^{0}\to\Xi^{0}\pi^{0})/{\cal B}(\Xi_{c}^{0}\to\Xi^{-}\pi^{+}) = 0.48 \pm 0.02 ({\rm stat}) \pm 0.03 ({\rm syst}) ,$$ $${\cal B}(\Xi_{c}^{0}\to\Xi^{0}\eta)/{\cal B}(\Xi_{c}^{0}\to\Xi^{-}\pi^{+}) = 0.11 \pm 0.01 ({\rm stat}) \pm 0.01 ({\rm syst}) ,$$ $${\cal B}(\Xi_{c}^{0}\to\Xi^{0}\eta^{\prime})/{\cal B}(\Xi_{c}^{0}\to\Xi^{-}\pi^{+}) = 0.08 \pm 0.02 ({\rm stat}) \pm 0.01 ({\rm syst}) $$ for the first time, where the uncertainties are statistical ($\rm stat$) and systematic ($\rm syst$). [...]
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2024-06-20 11:24 |
[PUBDB-2024-04808]
Preprint
Adachi, I. ; Aggarwal, L. ; Ahmed, H. ; et al
Measurement of the energy dependence of the $e^+e^- \to B\bar{B}$, $B\bar{B}{}^*$, and $B^*\bar{B}{}^*$ cross sections at Belle~II
[Belle II Preprint 2024-016; KEK Preprint 2024-12; arXiv:2405.18928]
We report measurements of the $e^+e^- \to B\bar{B}$, $B\bar{B}{}^*$, and $B^*\bar{B}{}^*$ cross sections at four energies, 10653, 10701, 10746 and 10805 MeV, using data collected by the Belle~II experiment. We reconstruct one $B$ meson in a large number of hadronic final states and use its momentum to identify the production process. [...]
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2024-06-20 11:19 |
[PUBDB-2024-04806]
Preprint
Adachi, I. ; Aggarwal, L. ; Aihara, H. ; et al
Search for the decay $B^{0}\to\gamma\gamma$ using Belle and Belle II data
[Belle II Preprint: 2024-017; KEK Preprint: 2024-13; arXiv:2405.19734]
We report the result of a search for the rare decay $B^{0} \to \gamma \gamma$ using a combined dataset of $753\times10^{6}$$B\bar{B}$ pairs collected by the Belle experiment and $387\times10^{6}$$B\bar{B}$ pairs collected by the Belle II experiment from decays of the $\rm \Upsilon(4S)$ resonance produced in $e^{+}e^{-}$ collisions. A simultaneous fit to the Belle and Belle II data sets yields $11.0^{+6.5}_{-5.5}$ signal events, corresponding to a 2.5$\sigma$ significance. [...]
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2024-06-20 11:15 |
[PUBDB-2024-04805]
Preprint
Adachi, I. ; Adamczyk, K. M. ; Aggarwal, L. ; et al
Test of light-lepton universality in $\tau$ decays with the Belle II experiment
[Belle II Preprint 2024-002; KEK Preprint 2023-49; arXiv:2405.14625]
We present a measurement of the ratio $R_\mu = \mathcal{B}(\tau^-\to \mu^-\bar\nu_\mu\nu_\tau) / \mathcal{B}(\tau^-\to e^-\bar\nu_e\nu_\tau)$ of branching fractions $\mathcal{B}$ of the $\tau$ lepton decaying to muons or electrons using data collected with the Belle II detector at the SuperKEKB $e^+e^-$ collider. The sample has an integrated luminosity of 362 fb$^{-1}$ at a centre-of-mass energy of 10.58 GeV. [...]
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2024-06-12 14:07 |
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2024-06-07 14:10 |
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