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Study of K+ → π+π–π+γ Decay in the OKA Experiment OKA实验中K+→π+π -π +γ衰变的研究
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-31 DOI: 10.1134/S0021364026601442
A. Artamonov, A. Gorin, Ye. Gushchin, S. Donskov, B. Zalikhanov, A. Inyakin, G. Kekelidze, V. Kolosov, A. Konoplyannikov, V. Kravtsov, Yu. Kudenko, A. Kulik, V. Kurshetsov, V. Lishin, V. Lysan, M. Medynskyi, A. Okhotnikov, V. Obraztsov, V. Polyakov, V. Rykalin, A. Sadovskiy, V. Samoilenko, S. Slabospitskiy, I. Tiurin, V. Uvarov, A. Filin, S. Filippov, G. Khaustov, S. Kholodenko, A. Khudyakov, M. Shapkin, O. Yushchenko
{"title":"Study of K+ → π+π–π+γ Decay in the OKA Experiment","authors":"A. Artamonov,&nbsp;A. Gorin,&nbsp;Ye. Gushchin,&nbsp;S. Donskov,&nbsp;B. Zalikhanov,&nbsp;A. Inyakin,&nbsp;G. Kekelidze,&nbsp;V. Kolosov,&nbsp;A. Konoplyannikov,&nbsp;V. Kravtsov,&nbsp;Yu. Kudenko,&nbsp;A. Kulik,&nbsp;V. Kurshetsov,&nbsp;V. Lishin,&nbsp;V. Lysan,&nbsp;M. Medynskyi,&nbsp;A. Okhotnikov,&nbsp;V. Obraztsov,&nbsp;V. Polyakov,&nbsp;V. Rykalin,&nbsp;A. Sadovskiy,&nbsp;V. Samoilenko,&nbsp;S. Slabospitskiy,&nbsp;I. Tiurin,&nbsp;V. Uvarov,&nbsp;A. Filin,&nbsp;S. Filippov,&nbsp;G. Khaustov,&nbsp;S. Kholodenko,&nbsp;A. Khudyakov,&nbsp;M. Shapkin,&nbsp;O. Yushchenko","doi":"10.1134/S0021364026601442","DOIUrl":"10.1134/S0021364026601442","url":null,"abstract":"<p>The OKA experiment has accumulated a significant statistics of <span>({{K}^{ + }})</span>-meson decays. This allowed us to select about 2300 events of the rare <span>({{K}^{ + }} to {{pi }^{ + }}{{pi }^{ - }}{{pi }^{ + }}gamma )</span> decay with the photon energy in the kaon rest frame of 10 MeV &lt; <span>(E_{gamma }^{*})</span> &lt; 70 MeV and to measure the decay branching ratio for this region: <i>BR</i>(3πγ) = <span>((6.36 pm {{0.14}_{{{text{stat}}}}} pm {{0.3}_{{{text{syst}}}}}) times {{10}^{{ - 5}}})</span>. The differential branching ratio as a function of the energy <span>(E_{gamma }^{*})</span> has also been obtained. The results have been compared with theoretical predictions derived within the framework of chiral perturbation theory (ChPT).</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 12","pages":"803 - 807"},"PeriodicalIF":1.1,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148615047","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
Dynamics of Photoinduced Lattice Heating and Electron–Phonon Relaxation in Gold Single Crystals According to Ultrafast Electron Diffraction Data 基于超快电子衍射数据的金单晶光致晶格加热和电子-声子弛豫动力学
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-31 DOI: 10.1134/S0021364026601703
B. N. Mironov, D. G. Poydashev, S. A. Aseyev, E. A. Ryabov
{"title":"Dynamics of Photoinduced Lattice Heating and Electron–Phonon Relaxation in Gold Single Crystals According to Ultrafast Electron Diffraction Data","authors":"B. N. Mironov,&nbsp;D. G. Poydashev,&nbsp;S. A. Aseyev,&nbsp;E. A. Ryabov","doi":"10.1134/S0021364026601703","DOIUrl":"10.1134/S0021364026601703","url":null,"abstract":"<p>The heating of 26–100-nm-thick gold films exposed to 515-nm femtosecond laser radiation has been studied in real time using short electron pulses. Analysis of diffraction kinetics within the Fermi gas model has made it possible to determine the electron–phonon coupling constants (1–3) × 10<sup>16</sup> W/(K m<sup>3</sup>), which are in good agreement with theory at electron temperatures <i>T</i><sub><i>e</i></sub> &lt; 10 kK. The obtained results have made it possible to evaluate the lower limit of the melting time of Au (<i>t</i><sub>m</sub> = 70 ps) at a threshold fluence corresponding to the energy required to heat the crystal and supply the latent heat of the phase transition.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 12","pages":"832 - 837"},"PeriodicalIF":1.1,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026601703.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148615091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
States Dressing Analysis in a Transmon–Transmon–Bus System 变送器-变送器-母线系统状态修整分析
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-31 DOI: 10.1134/S002136402660120X
P. A. Gladilovich, R. A. Migdisov, A. V. Sabluk, P. S. Burtsev, N. N. Abramov, N. Yu. Rudenko, V. I. Chichkov, N. A. Maleeva
{"title":"States Dressing Analysis in a Transmon–Transmon–Bus System","authors":"P. A. Gladilovich,&nbsp;R. A. Migdisov,&nbsp;A. V. Sabluk,&nbsp;P. S. Burtsev,&nbsp;N. N. Abramov,&nbsp;N. Yu. Rudenko,&nbsp;V. I. Chichkov,&nbsp;N. A. Maleeva","doi":"10.1134/S002136402660120X","DOIUrl":"10.1134/S002136402660120X","url":null,"abstract":"<p>The multi-qubit gates fidelity of superconducting quantum processors can be limited due to the dressing of computational states by noncomputational ones. Here, we experimentally and analytically investigate a transmon–transmon–bus system where the computational states dressing is tunable over a broad range. We estimate the dressing using three methods: a full three-element model, an effective mode approach, and an unperturbed mode approach. The obtained results highlight the importance of the accurate estimation and control of the computational states dressing in order to optimize gates on superconducting platform.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 12","pages":"873 - 880"},"PeriodicalIF":1.1,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S002136402660120X.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148615041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Two-Stage Coalescence of Droplets in the Confined Geometry of Hele–Shaw Cells Hele-Shaw细胞内液滴的两阶段聚结
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-31 DOI: 10.1134/S0021364026606858
P. V. Dolganov, N. A. Spiridenko
{"title":"Two-Stage Coalescence of Droplets in the Confined Geometry of Hele–Shaw Cells","authors":"P. V. Dolganov,&nbsp;N. A. Spiridenko","doi":"10.1134/S0021364026606858","DOIUrl":"10.1134/S0021364026606858","url":null,"abstract":"<p>Coalescence and Rayleigh–Plateau instability of liquid jets and long cylinders are among the most studied areas of fluid dynamics. Two stages of the coalescence of isotropic droplets in a nematic environment in flat Hele–Shaw cells have been revealed. At the first stage, the formation of an isotropic bridge between droplets occurs only in the middle of the cell. Thin layers of nematic remain on the cell surface. In the second stage, the nematic layers on the surface become unstable and disappear with the formation of microdroplets. The second stage of transformation resembles the Rayleigh–Plateau instability with the formation of satellite droplets. The discovered two-stage coalescence has not yet been observed in either isotropic or liquid crystalline media and has not been predicted theoretically.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 12","pages":"857 - 863"},"PeriodicalIF":1.1,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026606858.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148615092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Criteria for the Formation of Laser-Induced Periodic Surface Structures in Phase-Change Materials under Femtosecond Irradiation 飞秒辐照下相变材料激光诱导周期性表面结构形成的判据
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-31 DOI: 10.1134/S0021364026601065
O. I. Sokolovskaya, D. V. Shuleiko, M. P. Smayev, Ya. S. Lebedeva, S. V. Zabotnov, L. A. Golovan, P. K. Kashkarov, S. A. Kozyukhin
{"title":"Criteria for the Formation of Laser-Induced Periodic Surface Structures in Phase-Change Materials under Femtosecond Irradiation","authors":"O. I. Sokolovskaya,&nbsp;D. V. Shuleiko,&nbsp;M. P. Smayev,&nbsp;Ya. S. Lebedeva,&nbsp;S. V. Zabotnov,&nbsp;L. A. Golovan,&nbsp;P. K. Kashkarov,&nbsp;S. A. Kozyukhin","doi":"10.1134/S0021364026601065","DOIUrl":"10.1134/S0021364026601065","url":null,"abstract":"<p>The possibility of forming periodic surface structures in amorphous GeTe and Sb<sub>2</sub>Te<sub>3</sub> thin films irradiated by 1030-nm femtosecond laser pulses has been studied. The inclusion of nonlinear absorption and photoinduced electron generation within the framework of the surface electromagnetic wave excitation theory allows the prediction of the formation or absence of surface gratings in these materials induced by ultrashort laser pulses. The simulation results are consistent with experimental data.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 12","pages":"816 - 823"},"PeriodicalIF":1.1,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026601065.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148615107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Smith–Purcell Radiation from a Discrete Target Located on the Axis of a Hollow Electron Beam 位于空心电子束轴线上的离散目标的史密斯-珀塞尔辐射
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-31 DOI: 10.1134/S0021364026601399
D. Yu. Sergeeva, A. A. Tishchenko
{"title":"Smith–Purcell Radiation from a Discrete Target Located on the Axis of a Hollow Electron Beam","authors":"D. Yu. Sergeeva,&nbsp;A. A. Tishchenko","doi":"10.1134/S0021364026601399","DOIUrl":"10.1134/S0021364026601399","url":null,"abstract":"<p>The characteristics of Smith–Purcell radiation are calculated for a hollow electron beam at the central axis of which a chain of sub-wavelength particles is located. We show that the spectral and angular characteristics of radiation depend in a complex way on the Lorentz factor of electrons. We show also that incoherent radiation depends on the transverse dimensions of the beam. Interestingly, the transverse component of the Coulomb field of the electron does not contribute to the intensity of coherent radiation. This leads to the fact that for high electron energies, coherent radiation becomes comparable to incoherent one, even for a short beam. The results will be useful for efficient radiation generation and diagnostics of hollow beams, including using incoherent radiation.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 12","pages":"838 - 842"},"PeriodicalIF":1.1,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148615038","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
Stable Modes in a Magnon Bose–Einstein Condensate Self-Generator 磁振子玻色-爱因斯坦凝聚自发生器的稳定模式
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-31 DOI: 10.1134/S0021364026601600
Yu. M. Bunkov, P. M. Vetoshko, A. N. Kuzmichev, D. S. Novokreshchenov, D. A. Samodelkin
{"title":"Stable Modes in a Magnon Bose–Einstein Condensate Self-Generator","authors":"Yu. M. Bunkov,&nbsp;P. M. Vetoshko,&nbsp;A. N. Kuzmichev,&nbsp;D. S. Novokreshchenov,&nbsp;D. A. Samodelkin","doi":"10.1134/S0021364026601600","DOIUrl":"10.1134/S0021364026601600","url":null,"abstract":"<p>Recently, we have obtained a permanently existing Bose–Einstein condensate (BEC) of magnons in the self-generation mode. We have shown that magnon relaxation processes do not disturb the coherent state of the BEC when magnon relaxation is compensated by exciting new magnons under the effect of an amplified signal of magnon BEC emission applied to the sample. This is due to the boson enhancement effect, whereby only magnons corresponding to the quantum state of the BEC are excited in the presence of the BEC. In this work, we report the new studies, where a set of stable condensate states that are determined by the phase relationship of the radio-frequency signal emitted by the BEC and the amplified signal fed back have been obtained. The formation of stable regions of BEC generation corresponding to a phase jump multiple of 2π on the feedback line has been experimentally detected. A theoretical model has been constructed to describe the process of transition between BEC states in a self-generator. This model has much in common with the well-known washboard model for phase qubits.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 12","pages":"851 - 856"},"PeriodicalIF":1.1,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026601600.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148615040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of the Pressure on the Splitting of the Superfluid Transition in 3He in Nematic Aerogel 压力对向列型气凝胶中3He超流过渡分裂的影响
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-28 DOI: 10.1134/S002136402660744X
V. V. Dmitriev, D. V. Petrova, A. A. Soldatov, A. N. Yudin
{"title":"Effect of the Pressure on the Splitting of the Superfluid Transition in 3He in Nematic Aerogel","authors":"V. V. Dmitriev,&nbsp;D. V. Petrova,&nbsp;A. A. Soldatov,&nbsp;A. N. Yudin","doi":"10.1134/S002136402660744X","DOIUrl":"10.1134/S002136402660744X","url":null,"abstract":"<p>Here, we present the results of an investigation of how the pressure affects the splitting of the superfluid transition temperature in <sup>3</sup>He in anisotropic aerogel. It is well known that boundary conditions significantly influence the properties of superfluid phases in aerogel. When aerogel strands are coated with a <sup>4</sup>He layer in magnetic field, new phases, such as the polar, polar-distorted A (DA), polar-distorted B (DB), and <span>(beta )</span> phases, become energetically favorable. In contrast, without this coating, the system tends to favor phases resembling the bulk A, B, and A<sub>1</sub> phases. Our earlier results showed a nonlinear dependence of the superfluid transition temperature splitting in pure <sup>3</sup>He, but the range of nonlinearity did not match the theoretical predictions based on magnetic scattering effects. To further investigate this discrepancy, we performed measurements of the splitting under varying pressures for both pure <sup>3</sup>He and with <sup>4</sup>He coverage of the aerogel strands.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 3","pages":"197 - 203"},"PeriodicalIF":1.1,"publicationDate":"2026-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909653","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
Conductor–Insulator Crossover in the Steady-State Ultracold Plasmas 稳态超冷等离子体中的导体-绝缘体交叉
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-28 DOI: 10.1134/S0021364026606937
Yu. V. Dumin, L. M. Svirskaya
{"title":"Conductor–Insulator Crossover in the Steady-State Ultracold Plasmas","authors":"Yu. V. Dumin,&nbsp;L. M. Svirskaya","doi":"10.1134/S0021364026606937","DOIUrl":"10.1134/S0021364026606937","url":null,"abstract":"<p>We present a theoretical model of the ionization–recombination balance in the ultracold Rydberg gas–plasma mixture, which is caused by the collective processes rather than by individual interparticle interactions. We consider the electron–ion system where each electron moves for the most part of its time in the effective centrifugal potential formed by the nearest ion and sometimes jumps to the neighboring potential wells due to the perturbations from remote particles. These perturbations are described by a thermal bath with the effective “virial” temperature. Then, the electron with a sufficiently high energy, which can escape from the local potential well, should be considered as free (conducting) one; while the electron with low energy, confined within the well, as forming the Rydberg atom. As follows from our calculations, there is a sharp crossover from the insulating phase (Rydberg gas) to the conducting one (plasma) with increase in the particle density, which somewhat resembles the Mott transition in condensed-matter physics. This model should be well relevant to the steady-state ultracold plasmas obtained in the most recent experiments and represents a promising direction for further research.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 3","pages":"185 - 191"},"PeriodicalIF":1.1,"publicationDate":"2026-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026606937.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Two-Particle Azimuthal Correlations and Double Nuclear Modification Factor in High-Energy Heavy-Ion Collisions 高能重离子碰撞中的双粒子方位相关及双核修饰因子
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-28 DOI: 10.1134/S0021364026607530
A. S. Chernyshov, I. P. Lokhtin, A. M. Snigirev
{"title":"Two-Particle Azimuthal Correlations and Double Nuclear Modification Factor in High-Energy Heavy-Ion Collisions","authors":"A. S. Chernyshov,&nbsp;I. P. Lokhtin,&nbsp;A. M. Snigirev","doi":"10.1134/S0021364026607530","DOIUrl":"10.1134/S0021364026607530","url":null,"abstract":"<p>The finer details of jet quenching in high-energy heavy-ion collisions are analyzed within the framework of the HYDJET++ model using the double nuclear modification factor. This factor is studied for various types of final-state hadrons and different two-particle azimuthal configurations. The results show that the factorization of double nuclear modification factor holds almost exactly when the two final particles originate from different jets, but it breaks down noticeably when they come from a single jet, assuming that the effect of double parton scattering is negligible. The significant deviation of the ratio of the double nuclear modification factor and the product of single nuclear modification factors from unity in the case of back-to-back particle configurations can be interpreted as the result of double parton scattering effects.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 3","pages":"157 - 163"},"PeriodicalIF":1.1,"publicationDate":"2026-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026607530.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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