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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
13:40
arXiv [PUBDB-2022-04403] Preprint

Evidence of a new excited charmed baryon decaying to $\Sigma_{c}(2455)^{0,++} \pi^{\pm}$
[Belle Preprint 2022-08; KEK Preprint 2022-7; arXiv:2206.08822]
 GO
We present the study of $\bar{B}^{0} \to \Sigma_{c}(2455)^{0,++} \pi^{\pm} \bar{p}$ decays based on $772\times 10^{6}$ $B\bar{B}$ events collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The $\Sigma_{c}(2455)^{0,++} $ candidates are reconstructed via their decay to $\Lambda_{c}^{+} \pi^{\mp}$ and $\Lambda_{c}^{+}$ decays to $pK^{-}\pi^{+},~pK_{S}^{0},$ and $\Lambda\pi^{+}$ final states. [...]
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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
; ; ; et al
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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2022-08-12
10:25
OpenAccess [PUBDB-2022-04360] Journal Article
; ; ; et al
Low moments of the four-loop splitting functions in QCD
[DESY 21-203; LTH 1282; NIKHEF 21-030; arXiv:2111.15561]
We have computed the four lowest even-N moments of all four splitting functions for the evolution of flavour-singlet parton densities of hadrons at the fourth order in the strong coupling constant αs. The perturbative expansion of these moments, and hence of the splitting functions for momentum fractions x≳0.1, is found to be well behaved with relative αs-coefficients of order one and sub-percent effects on the scale derivatives of the quark and gluon distributions at αs≲0.2. [...]
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2022-08-12
10:03
OpenAccess [PUBDB-2022-04359] Journal Article
; ; ; et al
The Forward Physics Facility: Sites, experiments, and physics potential
[BNL-222142-2021-FORE; CERN-PBC-Notes-2021-025; DESY-21-142; FERMILAB-CONF-21-452-AE-E-ND-PPD-T; KYUSHU-RCAPP-2021-01; LU-TP-21-36; PITT-PACC-2118; SMU-HEP-21-10; UCI-TR-2021-22; arXiv:2109.10905]
The Forward Physics Facility (FPF) is a proposal to create a cavern with the space and infrastructure to support a suite of far-forward experiments at the Large Hadron Collider during the High Luminosity era. Located along the beam collision axis and shielded from the interaction point by at least 100 m of concrete and rock, the FPF will house experiments that will detect particles outside the acceptance of the existing large LHC experiments and will observe rare and exotic processes in an extremely low-background environment. [...]
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2022-08-10
16:07
OpenAccess [PUBDB-2022-04349] Journal Article
; ; ; et al
Dynamics of binary systems to fourth Post-Minkowskian order from the effective field theory approach
[DESY-21-093; MPP-2021-83; arXiv:2106.08276]
We present the contribution from potential interactions to the dynamics of non-spinning binaries to fourth Post-Minkowskian (4PM) order. This is achieved by computing the scattering angle to O(G$^4$) using the effective field theory approach and deriving the bound radial action through analytic continuation. [...]
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2022-08-10
15:52
OpenAccess [PUBDB-2022-04348] Preprint

Measurements of Higgs boson production in the decay channel with a pair of $\tau$ leptons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
[CERN-EP-2022-027; CMS-HIG-19-010; arXiv:2204.12957]
Measurements of Higgs boson production, where the Higgs boson decays into a pair of $\tau$ leptons, are presented, using a sample of proton-proton collisions collected with the CMS experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb$^{-1}$. Three analyses are presented. [...]
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2022-08-10
15:40
OpenAccess [PUBDB-2022-04347] Preprint

Search for a massive scalar resonance decaying to a light scalar and a Higgs boson in the four b quarks final state with boosted topology
[CERN-EP-2022-034; CMS-B2G-21-003; arXiv:2204.12413]
We search for new massive scalar particles X and Y through the resonant process X $\to$ YH $\to$ $\mathrm{b\bar{b}b\bar{b}}$, where H is the standard model Higgs boson. Data from CERN LHC proton-proton collisions are used, collected at a centre-of-mass energy of 13 TeV in 2016-2018 and corresponding to an integrated luminosity of 138 fb$^{-1}$. [...]
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