Bulletin of the Lebedev Physics Institute最新文献

Interactions of Dirac Dark Matter Particles in the E6 Composite Higgs Model 狄拉克暗物质粒子在E6复合希格斯模型中的相互作用

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-16 DOI: 10.3103/S1068335626600774

M. G. Belyakova

引用次数: 0

Measurement of the Inclusive Branching-Fraction Ratio ({{B}^{ - }} to {{D}^{{*0}}}{{pi }^{ - }}) to ({{B}^{ - }} to {{D}^{0}}{{pi }^{ - }}) at Belle and Belle II 百丽和百丽的包容性分支分数比({{B}^{ - }} to {{D}^{{*0}}}{{pi }^{ - }})至({{B}^{ - }} to {{D}^{0}}{{pi }^{ - }})的测量2

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-16 DOI: 10.3103/S1068335626600920

S. Zakharov

{"title":"Measurement of the Inclusive Branching-Fraction Ratio ({{B}^{ - }} to {{D}^{{*0}}}{{pi }^{ - }}) to ({{B}^{ - }} to {{D}^{0}}{{pi }^{ - }}) at Belle and Belle II","authors":"S. Zakharov","doi":"10.3103/S1068335626600920","DOIUrl":"10.3103/S1068335626600920","url":null,"abstract":"We report the status of an ongoing measurement of the branching-fraction ratio (mathcal{B})(B– → ({{D}^{{*0}}}{{pi }^{ - }}){text{/}}mathcal{B}({{B}^{ - }} to {{D}^{0}}{{pi }^{ - }})) using (711{kern 1pt} ,{text{f}}{{{text{b}}}^{{ - 1}}}) of Belle data and (362,{kern 1pt} {text{f}}{{{text{b}}}^{{ - 1}}}) of Belle II data collected at the (Upsilon (4S)) resonance. The signal yields are extracted with an inclusive recoil-mass method: one B meson (the tag-B) is fully reconstructed in hadronic modes, and only the charged pion from the signal B is reconstructed. A deep neural-network classifier is used for background suppression. The invariant mass of the remaining unreconstructed particles, referred to as the recoil mass, is calculated using the known initial ({{e}^{ + }}{{e}^{ - }}) state and the reconstructed tag-B and charged pion, and is fit to extract the (Dpi ) and (D{text{*}}pi ) yields. The fit uses separate signal shapes for correctly and incorrectly reconstructed tag-(B) candidates. The branching-fraction ratio remains blinded while the analysis procedure is finalized; we obtain a statistical uncertainty of (1.7% ). For comparison, the world-average PDG relative uncertainties are 2.2% for ({{B}^{ - }} to {{D}^{0}}{{pi }^{ - }}) and (2.9% ) for ({{B}^{ - }} to {{D}^{{*0}}}{{pi }^{ - }}). The ({{B}^{ - }} to {{D}^{{(*)0}}}{{pi }^{ - }}) fits also determine tag-mode-dependent corrections to the ({{B}_{{{text{tag}}}}}) reconstruction efficiency and good-tag fractions. These corrections are used in the inclusive measurement of the branching fraction of ({{B}^{ - }} to X(3872){{K}^{ - }}).","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 9","pages":"394 - 401"},"PeriodicalIF":0.6,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Description of Doubly Heavy Tetraquarks Within the Relativistic Quark Model 相对论夸克模型中双重四夸克的描述

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-16 DOI: 10.3103/S1068335626600889

V. O. Galkin, E. M. Savchenko

引用次数: 0

Effect of Doping of Ag/α-Si Memristors with Ti Ti掺杂对Ag/α-Si忆阻器的影响

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-16 DOI: 10.3103/S1068335626600336

A. S. Samsonova, O. A. Klimenko, V. N. Antonov

引用次数: 0

CP-Asymmetry in (Upsilon ) Decays: Contributions of C-odd and C-even States of the ({{B}^{0}}{{bar {B}}^{0}}) (Upsilon )衰变中的cp -不对称性：c奇数态和c偶态的贡献 ({{B}^{0}}{{bar {B}}^{0}})

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-16 DOI: 10.3103/S1068335626600890

N. A. Panchenko, S. I. Godunov

引用次数: 0

Dynamics of Stimulated Scattering of Laser Radiation in a Colloidal Solution of Gold Nanoparticles 激光辐射在金纳米粒子胶体溶液中的受激散射动力学

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-16 DOI: 10.3103/S1068335626600841

A. F. Bunkin, M. A. Davydov, A. N. Fedorov, I. V. Baimler

引用次数: 0

Role of Dynamic Screening in Energy Transfer to Lattice Atoms in Ion Tracks Formed in GaN under Electronic Stopping 电子停止作用下氮化镓离子轨道中动态筛选对晶格原子能量传递的作用

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-16 DOI: 10.3103/S1068335626600543

S. V. Moskalets, R. A. Rymzhanov, A. E. Volkov

引用次数: 0

Optical Damage Threshold of BaGa2GeS6 Crystals Irradiated with 1.03 μm Femtosecond and Picosecond Laser Pulses 1.03 μm飞秒和皮秒激光脉冲辐照BaGa2GeS6晶体的光学损伤阈值

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-05 DOI: 10.3103/S1068335626600488

D. V. Badikov, M. V. Ionin, I. O. Kinyaevskiy, P. P. Pakhol’chuk, F. S. Smyk

{"title":"Optical Damage Threshold of BaGa2GeS6 Crystals Irradiated with 1.03 μm Femtosecond and Picosecond Laser Pulses","authors":"D. V. Badikov, M. V. Ionin, I. O. Kinyaevskiy, P. P. Pakhol’chuk, F. S. Smyk","doi":"10.3103/S1068335626600488","DOIUrl":"10.3103/S1068335626600488","url":null,"abstract":"We report the experimental measurement of the optical damage threshold of the BaGa2GeS6 crystal surface irradiated with laser pulses with a wavelength of 1.03 μm and pulse durations ranging from 0.3 to 10 ps. Under single-pulse irradiation, the threshold energy density for optical damage was approximately 0.6 J/cm2 (intensity ∼1.8 TW/cm2) for 0.3 ps pulses and increased gradually to 2.2 J/cm2 (intensity ∼0.22 TW/cm2) for 10 ps pulses. The optical damage threshold of the BaGa2GeS6 crystal surface is found to exhibit a weak dependence on the pulse repetition rate: as the frequency increases from 1 Hz to 100 kHz, the optical damage threshold decreases from 0.6 to 0.45 J/cm2. Analysis of literature data shows that the optical damage threshold for BaGa2GeS6 irradiated by femto- and picosecond laser pulses with a wavelength of 1 μm is an order of magnitude higher than that of traditional nonlinear crystals such as AgGaS2 and LiGaS2.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 3","pages":"S213 - S217"},"PeriodicalIF":0.6,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of the Properties of Nanostructured SiO2 Antireflective Coatings for Optical Elements 光学元件用纳米SiO2减反射涂层性能研究

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-05 DOI: 10.3103/S1068335626600981

Yu. E. Geints, E. K. Panina

引用次数: 0

Investigation of the Two-Dimensional Structure of a Methane–Air Flat-Burner Flame Using Laser-Induced Fluorescence 用激光诱导荧光研究甲烷-空气平面燃烧器火焰的二维结构

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-05 DOI: 10.3103/S1068335626600865

A. D. Moroshkina, V. E. Rogozhnikov, A. A. Ponomareva, E. V. Sereshchenko, V. V. Mislavskii, V. V. Gubernov

{"title":"Investigation of the Two-Dimensional Structure of a Methane–Air Flat-Burner Flame Using Laser-Induced Fluorescence","authors":"A. D. Moroshkina, V. E. Rogozhnikov, A. A. Ponomareva, E. V. Sereshchenko, V. V. Mislavskii, V. V. Gubernov","doi":"10.3103/S1068335626600865","DOIUrl":"10.3103/S1068335626600865","url":null,"abstract":"We report a technique for the two-dimensional diagnostics of flames using laser-induced fluorescence in the saturated regime; the method involves measuring the absolute concentration of hydroxyl radicals (OH). A spatial resolution on the order of 50 μm is achieved, which is significantly smaller than the thermal flame thickness and the characteristic scales of heat-release zones. The technique is validated using a methane–air flame stabilized on a flat porous burner. It is shown that for rich mixtures, the combustion front structure is two-dimensional due to the formation of a secondary conical diffusion flame at the interface between the unreacted fuel and the surrounding air. It is found that the use of a nitrogen shielding stream co-flowing at the same linear velocity as the exiting fuel–air mixture from the burner completely suppresses the secondary flame and ensures a one-dimensional flame front structure in the central part of the burner, extending up to approximately 20 mm from its surface. It is demonstrated experimentally for the first time that, for pore diameters up to 400 μm, flow nonuniformities at the scale of the porous structure do not deform the combustion front. The developed technique enables the high-precision determination of laminar burning velocity based on critical flame blowoff conditions and can also be used to verify detailed kinetic mechanisms and validate numerical combustion models.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 3","pages":"S284 - S294"},"PeriodicalIF":0.6,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0