Charged pion electric polarizability from lattice QCD
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
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Results for “Mesons”
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Towards charged hadron polarizabilities from four-point functions in lattice QCD
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Measurement of the doubly Cabibbo-suppressed decay D + → K + π + π − π 0 with semileptonic tags
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Study of the process e + e − → π + π − π 0 using initial state radiation with BABAR
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Search for tetraquark states X c c s ¯ s ¯ in D s + D s + ( D s * + D s * + ) final states at Belle
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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
Absolute measurements of branching fractions of Cabibbo-suppressed hadronic D 0 ( + ) decays involving multiple pions
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79 ASTRONOMY AND ASTROPHYSICS↗
Measurement of the branching fraction and search for CP violation in D 0 → K $^{0}_{S}$ K $^{0}_{S}$ π + π - decays at Belle
We measure the branching fraction for the Cabibbo-suppressed decay D 0 → K $^{0}_{S}$ K $^{0}_{S}$ π + π - and search for CP violation via a measurement of the CP asymmetry A CP as well as the T-odd triple-product asymmetry a$^{T}_{CP}$. We use 922 fb -1 of data recorded by the Belle experiment, which ran at the KEKB asymmetric-energy e + e - collider. The branching fraction is measured relative to the Cabibbo-favored normalization channel D 0 → K $^{0}_{S}$ π + π - ; the result is $\mathscr{B}$( D 0 → K $^{0}_{S}$ K $^{0}_{S}$ π + π - )=[4.79±0.08(stat)±0.10(syst)±0.31(norm)]×10 -4 , where the first uncertainty is statistical, the second is systematic, and the third is from uncertainty in the normalization channel. We also measure A CP =[-2.51±1.44(stat)$^{+0.11}_{-0.10}$(syst)]%, and a$^{T}_{CP}$=[-1.95±1.42(stat)$^{+0.14}_{-0.12}$(syst)]%. These results show no evidence of CP violation.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
X ( 3872 ) , X ( 4014 ) , and their bottom partners at finite temperature
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Measurement of the B + /B 0 production ratio in e + e - collisions at the $\Upsilon$ (4S) resonance using B → J/Ψ($\ell\ell$)K decays at Belle
We measure the ratio of branching fractions for the $\Upsilon$ (4S) decays to B + B - and B 0 $\bar{B}$ 0 using B + → J/Ψ($\ell\ell$)K + and B 0 → J/Ψ($\ell\ell$)K 0 samples, where J/Ψ($\ell\ell$) stands for J/Ψ → $\ell$ + $\ell$ - ($\ell$ = e or μ), with 711 fb -1 of data collected at the $\Upsilon$ (4S) resonance with the Belle detector. We find the decay rate ratio of $\Upsilon$ (4S) → B + B - over $\Upsilon$ (4S) → B 0 $\bar{B}$ 0 to be 1.065 ± 0.012 ± 0.019 ± 0.047, which is the most precise measurement to date. The first and second uncertainties are statistical and systematic, respectively, and the third uncertainty is due to the assumption of isospin symmetry in B → J/Ψ($\ell\ell$) K.
79 ASTRONOMY AND ASTROPHYSICS↗
Nonperturbative aspects of the electromagnetic pion form factor at high energies
The structure of hadronic form factors at high energies and their deviations from perturbative quantum chromodynamics provide insight on nonperturbative dynamics. Using an approach that is consistent with dispersion relations, we construct a model that simultaneously accounts for the pion wave function, gluonic exchanges, and quark Reggeization. In particular, we find that quark Reggeization can be investigated at high energies by studying scaling violation of the form factor.
Form factors↗
New Structures in the J / ψ J / ψ Mass Spectrum in Proton-Proton Collisions at s = 13 TeV
A search is reported for near-threshold structures in the J / ψ J / ψ invariant mass spectrum produced in proton-proton collisions at s = 13 TeV from data collected by the CMS experiment, corresponding to an integrated luminosity of 135 fb − 1 . Three structures are found, and a model with quantum interference among these structures provides a good description of the data. A new structure is observed with a local significance above 5 standard deviations at a mass of 6638 − 38 + 43 ( stat ) − 31 + 16 ( syst ) MeV . Another structure with even higher significance is found at a mass of 6847 − 28 + 44 ( stat ) − 20 + 48 ( syst ) MeV , which is consistent with the X ( 6900 ) resonance reported by the LHCb experiment and confirmed by the ATLAS experiment. Evidence for another new structure, with a local significance of 4.7 standard deviations, is found at a mass of 7134 − 25 + 48 ( stat ) − 15 + 41 ( syst ) MeV . Results are also reported for a model without interference, which does not fit the data as well and shows mass shifts up to 150 MeV relative to the model with interference. © 2024 CERN, for the CMS Collaboration 2024 CERN
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
𝐵 → 𝜌ℓ$\bar{v}$ Resonance Form Factors from 𝐵→ 𝜋𝜋ℓ$\bar{v}$ in Lattice QCD
The decay 𝐵 → 𝜌ℓ$\bar{v}$ is an attractive process for determining the magnitude of the smallest Cabibbo-Kobayashi-Maskawa matrix element, |𝑉 𝑢𝑏 |, and can provide new insights into the origin of the long-standing exclusive-inclusive discrepancy in determinations of this standard-model parameter. This requires a nonperturbative QCD calculation of the 𝐵 → 𝜌 form factors 𝑉, 𝐴 0 , 𝐴 1 , and 𝐴 12 . The unstable nature of the 𝜌 resonance has prevented precise lattice QCD calculations of these form factors to date. Here, we present the first lattice QCD calculation of the 𝐵 → 𝜌 form factors in which the 𝜌 is treated properly as a resonance in 𝑃-wave 𝜋𝜋 scattering. To this end, we use the Lellouch-Lüscher finite-volume formalism to compute the 𝐵 → 𝜋𝜋 form factors as a function of both momentum transfer and 𝜋𝜋 invariant mass, and then analytically continue to the 𝜌 resonance pole. This calculation is performed with 2 + 1 dynamical quark flavors at a pion mass of approximately 320 MeV, and demonstrates a clear path toward results at the physical point.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Microstructural changes and mass transport in cement-based materials: A modeling approach
Highlights: • Concept to relate microstructural changes, mass transport, and chemical reactions in cement-based materials is presented. • Multi-physics modeling approach utilizing an extended version of the PNP equation and the geochemical code IPHREEQC. • Case studies indicate significant changes in mass transport properties due to alterations in the microstructure. • Microstructural changes depend on exposure and interactions between chemical reactions, pore structure, and mass transport. A generic modeling framework is presented to relate microstructural changes, i.e. changes in the pore volume distribution and phase assemblage, and mass transport in cement-based materials. The modeling framework accounts for mass transport and chemical equilibrium between ions in the pore solution and solid hydrates by means of an extended version of the Poisson-Nernst-Planck equation, in which the chemical equilibrium is solved by the external geochemical code IPHREEQC. Results of numerical studies concerning carbonation and leaching of a cement-based material indicate significant changes in mass transport properties due to chemical reactions leading to alterations in the microstructure. The resulting highly non-linear (both spatial and temporal) microstructural changes are thereby depending on the exposure and indicate that interactions between chemical reactions, pore structure changes, and mass transport have to be accounted for as a whole.
36 MATERIALS SCIENCE↗
The effect of jet-induced medium excitation on Λ/ k 0 s in jet in Pb-Pb collisions
In this work, we use CoLBT-hydro model for simultaneous event-by-event simulations of jet propagation and hydrodynamics evolution of the bulk medium including jet-induced medium excitation. The final reconstructed jet in heavy-ion collision include not only hadrons from medium response for the deposited energy and momentum of hard partons, but also hadrons from the fragmentation and recombination process of in-medium hard partons. We carry out the study with CoLBT-hydro of medium modification of the Λ/ k 0 s in jet in Pb-Pb collisions at √sNN=2.76TeV. We qualitatively describe the enhancement of the Λ/ k 0 s ratio in jet in the intermediate pT region due to the contribution from jet-induced medium flow.
73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
SEEMS: A Single Event Effects and Muon Spectroscopy facility at the Spallation Neutron Source
This study outlines a concept that would leverage the existing proton accelerator at the Spallation Neutron Source (SNS) of Oak Ridge National Laboratory to enable transformative science via one world-class facility serving two missions: Single Event Effects (SEE) and Muon Spectroscopy (μSR). The μSR portion would deliver the world’s highest flux and highest resolution pulsed muon beams for material characterization purposes, with precision and capabilities well beyond comparable facilities. The SEE capabilities deliver neutron, proton, and muon beams for aerospace industries that are facing an impending challenge to certify equipment for safe and reliable behavior under bombardment from atmospheric radiation originating from cosmic and solar rays. With negligible impact on the primary neutron scattering mission of the SNS, the proposed facility will have enormous benefits for both science and industry. Herein, we have designated this facility “SEEMS.”
47 OTHER INSTRUMENTATION↗
Test of lepton flavor universality in B ± → K ± μ + μ – and B ± → K ± e + e – decays in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A test of lepton flavor universality in B ± → K ± μ + μ – and B ± → K ± e + e – decays, as well as a measurement of differential and integrated branching fractions of a nonresonant B ± → K ± μ + μ – decay are presented. The analysis is made possible by a dedicated data set of proton-proton collisions at $\sqrt{s}$ = 13 TeV recorded in 2018, by the CMS experiment at the LHC, using a special high-rate data stream designed for collecting about 10 billion unbiased b hadron decays. The ratio of the branching fractions B(B ± → K ± μ + μ – ) to B(B ± → K ± e + e – ) is determined from the measured double ratio R(K) of these decays to the respective branching fractions of the B ± → J/ψK ± with J/ψ → μ + μ – and e + e – decays, which allow for significant cancellation of systematic uncertainties. The ratio R(K) is measured in the range 1.1 < q 2 < 6.0 GeV 2 , where q is the invariant mass of the lepton pair, and is found to be R(K) = 0.78$^{+0.47}_{-0.23}$, in agreement with the standard model expectation R(K) ≈ 1. This measurement is limited by the statistical precision of the electron channel. The integrated branching fraction in the same q 2 range, B(B ± → K ± μ + μ – ) = (12.42 ± 0.68) x 10 -8 , is consistent with the present world-average value and has a comparable precision.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Observation of the decays 𝐵 + → Σ 𝑐 (2455) ++ $\bar{Ξ}^-_c$ and 𝐵 0 → Σ 𝑐 (2455) 0 $\bar{Ξ}^0_𝑐$
We report the first observation of the two-body baryonic decays 𝐵 + → Σ 𝑐 (2455) ++ $\bar{Ξ}^-_c$ and 𝐵 0 → Σ 𝑐 (2455) 0 $\bar{Ξ}^0_𝑐$ with significances of 7.3𝜎 and 6.2𝜎, respectively, including statistical and systematic uncertainties. The branching fractions are measured to be ℬ(𝐵 + → Σ 𝑐 (2455) ++ $\bar{Ξ}^-_c$) = (5.74 ± 1.11 ± 0.42$^{+2.47}_{−1.53}$) ×10 −4 and ℬ(𝐵 0 → Σ 𝑐 (2455) 0 $\bar{Ξ}^0_𝑐$) = (4.83 ± 1.12 ± 0.37$^{+0.72}_{−0.60}$) ×10 −4 . The first and second uncertainties are statistical and systematic, respectively, while the third ones arise from the absolute branching fractions of $\bar{Ξ}^-_c$ or $\bar{Ξ}^0_𝑐$ decays. The data samples used for this analysis have integrated luminosities of 711 fb −1 and 365 fb −1 , and were collected at the ϒ(4𝑆) resonance by the Belle and Belle II detectors operating at the KEKB and SuperKEKB asymmetric-energy 𝑒 + 𝑒 − colliders, respectively.
branching fraction↗