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2022-08-16
13:49
OpenAccess [PUBDB-2022-04422] Book
; ; ; et al
TESLA: the superconducting electron-positron linear collider with an integrated X-ray laser laboratory. Technical design report. Part 6: Appendices
Hamburg : DESY 1 online resource (iii, 207 pages) : illustrations () [10.3204/PUBDB-2022-04422]  GO
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2022-08-16
13:48

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2022-08-16
13:47

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2022-08-16
13:46

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2022-08-16
13:45

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2022-08-16
13:44

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2022-08-15
13:43
OpenAccess [PUBDB-2022-04404] Preprint

Search for $X(3872)\to\pi^+\pi^-\pi^0$ at Belle
[Belle Preprint 2022-13; KEK Preprint 2022-12; arXiv:2206.08592]
We present a search for the decay $X(3872) \to \pi^+\pi^-\pi^0$ in the $(772\pm11)\times10^6$ $\Upsilon(4S)\to B \bar B$ data sample collected at the Belle detector, where the $X(3872)$ is produced in $B^{\pm}\to K^{\pm}X(3872)$ and $B^{0}\to K_{S}^0 X(3872)$ decays. We do not observe a signal, and set 90% credible upper limits for two different models of the decay processes: if the decay products are distributed uniformly in phase space, $\mathcal{B}(X(3872) \to \pi^+\pi^-\pi^0) < 1.3\%$; if $M(\pi^+\pi^-)$ is concentrated near the mass of the $D^0 \bar D^0$ pair in the process $X(3872)\to D^0\bar{D}^{*0}+c.c.\to D^0 \bar D^{0}\pi^0\to\pi^+ \pi^- \pi^0$, $\mathcal{B}(X(3872) \to \pi^+\pi^-\pi^0) < 1.2\times10^{-3}$..
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2022-08-15
10:43
OpenAccess [PUBDB-2022-04393] Preprint
; ; ; et al
Search for a dark photon and an invisible dark Higgs boson in $\mu^+\mu^-$ and missing energy final states with the Belle II experiment
[Belle II Preprint 2022-001; KEK Preprint 2022-6; arXiv:2207.00509]
The dark photon $A^\prime$ and the dark Higgs boson $h^\prime$ are hypothetical particles predicted in many dark sector models. We search for the simultaneous production of $A^\prime$ and $h^\prime$ in the dark Higgsstrahlung process $e^{+}e^{-}\rightarrow A^\prime \, h^\prime$ with $A^\prime \rightarrow \mu^+\mu^-$ and $ h^\prime$ invisible in electron-positron collisions at a center-of-mass energy of 10.58 GeV collected by the Belle II experiment in 2019. [...]
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2022-08-15
10:39
OpenAccess [PUBDB-2022-04392] Preprint
; ; ; et al
Measurement of the $\Lambda_c^+$ lifetime
[Belle II Preprint 2022-003; KEK Preprint 2022-13; arXiv:2206.15227]
An absolute measurement of the $\Lambda^{+}_c$ lifetime is reported using $\Lambda_c^+\rightarrow pK^-\pi^+$ decays in events reconstructed from data collected by the Belle II experiment at the SuperKEKB asymmetric-energy electron-positron collider. The total integrated luminosity of the data sample, which was collected at center-of-mass energies at or near the $\Upsilon(4S)$ resonance, is $207.2~\mbox{fb}^{-1}$. [...]
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2022-08-12
12:21
OpenAccess [PUBDB-2022-04368] Journal Article
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Axial-vector contributions in two-photon reactions: Pion transition form factor and deeply-virtual Compton scattering at NNLO in QCD
[DESY-21-068; arXiv:2106.01437]
Using the approach based on conformal symmetry we calculate the two-loop coefficient function for the axial-vector contributions to two-photon processes in the $\overline{\rm MS}$ scheme. This is the last missing element for the complete next-to-next-to-leading order (NNLO) calculation of the the pion transition form factor $\gamma^\ast\gamma\to \pi $ in perturbative QCD. [...]
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