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Abstract τ -charm facility (STCF) is an electron–positron collider proposed by the Chinese particle physics community. It is designed to operate in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of 0.5 × 1035cm−2·s−1or higher. The STCF will produce a data sample about a factor of 100 larger than that of the presentτ -charm factory — the BEPCII, providing a unique platform for exploring the asymmetry of matter-antimatter (charge-parity violation), in-depth studies of the internal structure of hadrons and the nature of non-perturbative strong interactions, as well as searching for exotic hadrons and physics beyond the Standard Model. The STCF project in China is under development with an extensive R&D program. This document presents the physics opportunities at the STCF, describes conceptual designs of the STCF detector system, and discusses future plans for detector R&D and physics case studies.Free, publicly-accessible full text available February 1, 2025 -
Free, publicly-accessible full text available December 1, 2024
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Free, publicly-accessible full text available November 1, 2024
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Free, publicly-accessible full text available November 1, 2024
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Abstract A description is presented of the algorithms used to reconstruct energy deposited in the CMS hadron calorimeter during Run 2 (2015–2018) of the LHC. During Run 2, the characteristic bunch-crossing spacing for proton-proton collisions was 25 ns, which resulted in overlapping signals from adjacent crossings. The energy corresponding to a particular bunch crossing of interest is estimated using the known pulse shapes of energy depositions in the calorimeter, which are measured as functions of both energy and time. A variety of algorithms were developed to mitigate the effects of adjacent bunch crossings on local energy reconstruction in the hadron calorimeter in Run 2, and their performance is compared.
Free, publicly-accessible full text available November 1, 2024 -
Free, publicly-accessible full text available November 1, 2024
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Free, publicly-accessible full text available November 1, 2024
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Abstract A search for decays to invisible particles of Higgs bosons produced in association with a top-antitop quark pair or a vector boson, which both decay to a fully hadronic final state, has been performed using proton-proton collision data collected at
by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138$${\sqrt{s}=13\,\text {Te}\hspace{-.08em}\text {V}}$$ . The 95% confidence level upper limit set on the branching fraction of the 125$$\,\text {fb}^{-1}$$ Higgs boson to invisible particles,$$\,\text {Ge}\hspace{-.08em}\text {V}$$ , is 0.54 (0.39 expected), assuming standard model production cross sections. The results of this analysis are combined with previous$${\mathcal {B}({\textrm{H}} \rightarrow \text {inv})}$$ searches carried out at$${\mathcal {B}({\textrm{H}} \rightarrow \text {inv})}$$ , 8, and 13$${\sqrt{s}=7}$$ in complementary production modes. The combined upper limit at 95% confidence level on$$\,\text {Te}\hspace{-.08em}\text {V}$$ is 0.15 (0.08 expected).$${\mathcal {B}({\textrm{H}} \rightarrow \text {inv})}$$ Free, publicly-accessible full text available October 1, 2024 -
Free, publicly-accessible full text available October 1, 2024
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Free, publicly-accessible full text available October 1, 2024