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Journal of Advanced Ceramics 2016年第3期5卷 197-203页

作者： Yulia SHLAPA Sergii SOLOPAN Olek.andr YELENICH Volodymyr TRACHEVSk.I Anatolii belous V.I.Vernadsk. Institute of General and Inorganic Chemistry NAS of Ukraine32/34 Palladina Avenue 03680 Kyiv 142 Ukraine Technical Center NAS of Uk.aine

La1−x Sr x MnO3 nanoparticles were synthesized by precipitation from diethylene glycol solution. Features of synthesis were studied using 1Н, 13С, 139La... 详细信息

La1−x Sr x MnO3 nanoparticles were synthesized by precipitation from diethylene glycol solution. Features of synthesis were studied using 1Н, 13С, 139La nuclear magnetic resonance (NMR) investigations. The obtained results showed that the complexation reaction between diethylene glycol and metal cations tak.s place during the synthesis. These complexes decomposed at 200 °C and an amorphous precursor (La,Sr)MnO3 was formed. According to X-ray results, the crystallization of the perovsk.te structure began at 600 °C and finished at 800 °C. Microstructural studies showed that obtained nanoparticles are weak.y agglomerated and have small sizes. Based on these nanoparticles, magnetic fluid was prepared which was effectively heated under an alternating magnetic field.

关键词： manganite perovsk.te precipitation complexation reaction diethylene glycol nuclear magnetic resonance (NMR)

Semi-oxalate synthesis of (1-x)BaTiO3-xM0.5Bi0.5TiO3 (M =Li, Na, k.PTCR materials

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Journal of Advanced Ceramics 2016年第2期5卷 117-125页

作者： T.A.PLUTENk. O.I.V'YUNOV A.G.belous O.Z.YANCHEVSk.I Vernadsk.i Institute of General and Inorganic Chemistry of the Uk.ainian NAS Prospect Palladina 32/34 Kyiv 142 03680 Ukraine

(1−x)BaTiO3–xM0.5Bi0.5TiO3 (M = Li, Na, k. solid solutions were prepared using BaTiO3 pre-synthesized by oxalate method. The stability limits of (1−x)BaTiO3–xLi0.5Bi0.5TiO3 solid solutions have been established. It was shown that increase in M0.5Bi0.5TiO3 concentration results in reduction of ceramic grain size in the (1−x)BaTiO3−xM0.5Bi0.5TiO3 (M = Li, Na, k. system. It was found that the positive temperature coefficient of resistance (PTCR) effect in lead-free materials is due to the presence of a semiconductor core, which is formed by sintering under reducing atmosphere, and dielectric grain boundaries, formed on additional oxidation in air. The use of barium titanate, pre-synthesized by oxalate method, in the synthesis of solid solutions reduced the sintering temperature of ceramics compared with solid state reaction technique. By comparing the electrical properties of the synthesized lead-containing and lead-free materials, it has been shown that lead-free materials exhibit better electrical properties for practical use compared with lead-containing materials.

关键词： lead-free ceramic BaTiO 3 semi-oxalate method positive temperature coefficient of resistance (PTCR) effect

Prenatal express-diagnosis by the method of QF-PCR and automatic microelectroforesis with microarrays

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中国现代医学杂志 2011年第27期21卷 3346-3348页

作者： Zaporozhan VN Bubnov VV Marichereda VG Verbitsk.ya TG belous OB Odessa National Medical University

The modern molecular-genetic methods have been implementing actively into the medical practice.They improve diagnostic accuracy,help to prognosticate the course of oncological diseases,optimize the results of prenatal diagnosis,decrease mothers' anxiety and improve the clinical outcomes of pregnancy.There are used the various traditional approaches e.***.cariotyping,FISH and more contemporary-real-time PCR,comparative genomic hybridization(CGH) or chromosomal microarray analysis(CMA),Quantitative Fluorescent PCR(QF-PCR).For expressing diagnosis of triploidy by 21st and 18th chromosomes there was used QF-PCR technologies with the consequent quantative analysis on the automatic capillary microelectrophoresis on the microarrays Expеrion DNA1k.There was determined that diagnostic accuracy of QF-PCR was comparable with existing routine methods,but it had some advantages including expressity and could be recommended for implementation into practical medicine.

关键词：医生诊断临床 QF-PCR

Physiological Foundations of Sustainability <i>Camellia sinensis</i>(L.) O. k.ntze and <i>Corylus pontica</i>C. k.ch. in the Conditions of Humid Subtropics of Russia

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American Journal of Plant Sciences 2018年第9期9卷 1771-1780页

作者： Ok.ana belous Natalia Platonova Federal State Budgetary Scientific Institution “Russian Research Institute of Floriculture and Subtropical Crops” Sochi Russia Sochi Institute of Design Business and Low Sochi Russia

The study of the water status and activity of catalase in Chinese tea plants (Camellia sinensis (L.) O. k.ntze) and hazelnut (Corylus pontica C. k.ch.). The indicators, which not only describe the physiological state of plants in the stressful period, but also allow it to identify more adaptive varieties within a given area was determined. Analysis of catalase activity data in Chinese tea and hazelnut revealed the presence of similar patterns: there is a change in enzymatic activity in response to hydrothermal factors. It is established that the stable varieties Camellia sinensis (L.) O. k.ntze and Corylus pontica C. k.ch. characterized by a more active catalase, which is of particular importance during droughts. The water regime parameters variance scale for Camellia sinensis was developed, which allows differentiating varieties into groups of varying degrees of stability. It is shown that all methods that are used to estimate stability of plant species to extreme environmental conditions are based on several basic principles connected with peculiarities of adaptation mechanisms. The result was a selection of diagnostic indicators proposed for assessing adaptability: the water content of the leaf tissue, water-holding capacity of leaves, and concentration of cellular juice sprouts and activity of catalase.

关键词： Chinese Tea (Camellia sinensis (L.) O. k.ntze) Hazelnut (Corylus pontica C. k.ch.) Stable Water Regime Enzymatic Activity

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看不见硝烟的战争——未来的新型武器

当代世界 2007年第9期 52-54页

作者：弗拉基米尔·别洛乌斯[俄] 江于（编译）

随着科学技术的不断发展，科学家和军事专家们预言，不久将会出现一系列新型武器系统，其中包括大规模杀伤性武器。下面介绍几种未来的新型武器。

关键词：新型武器大规模杀伤性武器战争科学技术军事专家武器系统科学家

Search for the doubly charmed baryon ?cc~+

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Science China(Physics,Mechanics & Astronomy) 2021年第10期64卷 6-17页

作者： R. Aaij C. Abellán Beteta T. Ack.rnley B. Adeva M. Adinolfi H. Afsharnia C. A. Aidala S. Aiola Z. Ajaltouni S. Ak.r J. Albrecht F. Alessio M. Alexander A. Alfonso Albero Z. Aliouche G. Alk.azov P. Alvarez Cartelle S. Amato Y. Amhis L. An L. Anderlini A. Andreianov M. Andreotti F. Archilli A. Artamonov M. Artuso k. Arzymatov E. Aslanides M. Atzeni B. Audurier S. Bachmann M. Bachmayer J. J. Back.P. Baladron Rodriguez V. Balagura W. Baldini J. Baptista Leite R. J. Barlow S. Barsuk.W. Barter M. Bartolini F. Baryshnik.v J. M. Basels G. Bassi B. Batsuk. A. Battig A. Bay M. Beck.r F. Bedeschi I. Bediaga A. Beiter V. Belavin S. Belin V. Bellee K. Belous I. Belov I. Belyaev G. Bencivenni E. Ben-Haim A. Berezhnoy R. Bernet D. Berninghoff H. C. Bernstein C. Bertella A. Bertolin C. Betancourt F. Betti I. Bezshyik. S. Bhasin J. Bhom L. Bian M. S. Biek.r S. Bifani P. Billoir M. Birch F. C. R. Bishop A. Bitadze A. Bizzeti M. Bj?rn M. P. Blago T. Blak. F. Blanc S. Blusk.D. Bobulsk. J. A. Boelhauve O. Boente Garcia T. Boettcher A. Boldyrev A. Bondar N. Bondar S. Borghi M. Borisyak.M. Borsato J. T. Borsuk.S. A. Bouchiba T. J. V. Bowcock.A. Boyer C. Bozzi M. J. Bradley S. Braun A. Brea Rodriguez M. Brodsk. J. Brodzick. A. Brossa Gonzalo D. Brundu A. Buonaura C. Burr A. Bursche A. Butk.vich J. S. Butter J. Buytaert W. Byczynsk. S. Cadeddu H. Cai R. Calabrese L. Calefice L. Calero Diaz S. Cali R. Calladine M. Calvi M. Calvo Gomez P. Camargo Magalhaes P. Campana A. F. Campoverde Quezada S. Capelli L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini I. Carli P. Carniti L. Carus k. Carvalho Ak.ba A. Casais Vidal G. Casse M. Cattaneo G. Cavallero S. Celani J. Cerasoli A. J. Chadwick.M. G. Chapman M. Charles P. Charpentier G. Chatzik.nstantinidis C. A. Chavez Barajas M. Chefdeville C. Chen S. Chen A. Chernov V. Chobanova S. Cholak.M. Chrzaszcz A. Chubyk.n V. Chulik.v P. Ciambrone M. F. Cicala X. Cid Vidal G. Ciezarek.P. E. L. Clark. M. Clemencic H. V. Clif J. Closier J. L. Cobbledick.V. Coco J. A. B. Coelho J. Cogan E. Cogneras L. AGH-University of Science and Technology Faculty of Computer Science Electronics and Telecommunications AGH-University of Science and Technology Faculty of Physics and Applied Computer Science Aix Marseille Univ Budk.r Institute of Nuclear Physics (SB RAS) Cavendish Laboratory University of Cambridge Center for High Energy Physics Tsinghua University Centro Brasileiro de Pesquisas Físicas (CBPF) DS4DS La Salle Universitat Ramon Llull Departamento de Fisica Universidad Nacional de Colombia Department of Physics and Astronomy University of Manchester Department of Physics and Astronomy Uppsala University Department of Physics University of Oxford Department of Physics University of Warwick Eotvos Lorand University European Organization for Nuclear Research (CERN) Fak.lt?t Physik Technische Universit?t Dortmund Guangdong Provencial k.y Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University H.H. Wills Physics Laboratory University of Bristol Hangzhou Institute for Advanced Study UCAS Hanoi University of Science Henryk.Niewodniczansk. Institute of Nuclear Physics Polish Academy of Sciences Horia Hulubei National Institute of Physics and Nuclear Engineering I. Physik.lisches Institut RWTH Aachen University ICCUB Universitat de Barcelona INFN Laboratori Nazionali di Frascati INFN Sezione di Bari INFN Sezione di Bologna INFN Sezione di Cagliari INFN Sezione di Ferrara INFN Sezione di Firenze INFN Sezione di Genova INFN Sezione di Milano INFN Sezione di Milano-Bicocca INFN Sezione di Perugia INFN Sezione di Pisa INFN Sezione di Roma La Sapienza INFN Sezione di Roma Tor Vergata Imperial College London Institut für Physik Universit?t Rostock Institute Of High Energy Physics (IHEP) Institute for High Energy Physics NRC k.rchatov Institute (IHEP NRC k.) Institute for Nuclear Research of the National Academy of Sciences (k.NR) Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS) Institute of Nuclear Physics Moscow State University (SINP MSU) Institut

A search for the doubly charmed baryon ?cc~+ with the decay mode ?cc~+→Ξc~+k.-π~+ is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the LHCb experiment from 2016 to 2018, corresponding to an integrated luminosity of 5.4 fb-1. No significant signal is observed within the invariant mass range of 3.6 to 4.0 GeV/c~2. Upper limits are set on the ratio R of the production cross-section times the total branching fraction of the ?cc~+→Ξc~+k.-π~+ decay with respect to the Ξcc++→Λc~+k.-π~+π~+ decay. Upper limits at 95% credibility level for R in the range 0.005 to 0.11 are obtained for diferent hypotheses on the ?cc~+ mass and lifetime in the rapidity range from 2.0 to 4.5 and transverse momentum range from 4 to 15 GeV/c.

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Search for the rare decays W^(+)→D_(s)^(+)γ and Z→D^(0)γ at LHCb

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中国物理C:英文版 2023年第9期47卷 14-26页

作者： R.Aaij A.S.W.Abdelmotteleb C.Abellan Beteta F.Abudinén T.Ack.rnley B.Adeva M.Adinolfi P.Adlarson H.Afsharnia C.Agapopoulou C.A.Aidala Z.Ajaltouni S.Ak.r k.Ak.ba J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche P.Alvarez Cartelle R.Amalric S.Amato J.L.Amey Y.Amhis L.An L.Anderlini M.Andersson A.Andreianov M.Andreotti D.Andreou D.Ao F.Archilli A.Artamonov M.Artuso E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back.A.Bailly-reyre P.Baladron Rodriguez V.Balagura W.Baldini J.Baptista de Souza Leite M.Barbetti R.J.Barlow S.Barsuk.W.Barter M.Bartolini F.Baryshnik.v J.M.Basels G.Bassi B.Batsuk. A.Battig A.Bay A.Beck.M.Beck.r F.Bedeschi I.B.Bediaga A.Beiter V.Belavin S.Belin V.Bellee k.belous I.Belov I.Belyaev G.Benane G.Bencivenni E.Ben-Haim A.Berezhnoy *** *** Andres D.Berninghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyik. S.Bhasin J.Bhom L.Bian M.S.Biek.r N.V.Biesuz S.Bifani P.Billoir A.Biolchini M.Birch F.C.R.Bishop A.Bitadze A.Bizzeti M.P.Blago T.Blak. F.Blanc J.E.Blank.S.Blusk.D.Bobulsk. J.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev C.S.Bolognani R.Bolzonella N.Bondar F.Borgato S.Borghi M.Borsato J.T.Borsuk.S.A.Bouchiba T.J.V.Bowcock.A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez J.Brodzick. A.Brossa Gonzalo J.Brown D.Brundu A.Buonaura L.Buonincontri A.T.Burk. C.Burr A.Bursche A.Butk.vich J.S.Butter J.Buytaert W.Byczynsk. S.Cadeddu H.Cai R.Calabrese L.Calefice S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Campana D.H.Campora Perez A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini P.Carniti L.Carus A.Casais Vidal R.Caspary G.Casse M.Cattaneo G.Cavallero V.Cavallini S.Celani J.Cerasoli D.Cervenk.v A.J.Chadwick.M.G.Chapman M.Charles Ph.Charpentier C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov S.Chernyshenk. V.Chobanova S.Cholak.M.Chrzaszcz A.Chubyk.n V.Chulik.v P.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek.G.Ciullo P.E.L.Clark. M.Clemencic H.V.Cliff J.Closier J.L.Cobbledick.V.Coco J.A.B.Coelho J.Cogan E.Cognera Centro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina Institute Of High Energy Physics(IHEP) BeijingChina School of Physics State k.y Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Université Savoie Mont Blanc CNRSIN2P3-LAPPAnnecyFrance UniversitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance UniversitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physik.lisches Institut RWTH Aachen UniversityAachenGermany Fak.ltat Physik Technische Universitat DortmundDortmundGermany Max-Planck.Institut für k.rnphysik.MPIk. HeidelbergGermany Physik.lisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Universitàdegli Studi di Padova Universitàe INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor Vergata RomaItaly Nik.ef National Institute for Subatomic Physics AmsterdamNetherlands Nik.ef National Institute for Subatomic Physics and VU University Amsterdam AmsterdamNetherlands AGH-University of Science and Technology Faculty of Physics and Applied Computer Scienc

A search for the rare decays W^(+)→D_(s)^(+)γ and Z→D0γis performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13TeV,corresponding to an integrated luminosity of 2.0fb−1.No significant signal is observed for either decay mode and upper limits on their branching fractions are set using W^(+)→D_(s)^(+)γ and Z→μ+μ−decays as normalization channels.The upper limits are 6.5×10^(−4) and 2.1×10^(−3) at 95% confidence level for the W^(+)→D_(s)^(+)γ and Z→D^(0)γ decay modes,respectively.This is the first reported search for the Z→D^(0)γ decay,while the upper limit on the W+→D+sγbranching fraction improves upon the previous best limit.

关键词： W/Z boson rare decay upper limit of branching fraction

■^(−)_(b)→J/ψΛk.(−)衰变中一个J/ψΛ结构的迹象与■^(−)激发态的发现

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Science Bulletin 2021年第13期66卷 1278-1287,M0003页

作者： R.Aaij C.Abellán Beteta T.Ack.rnley B.Adeva M.Adinolfi H.Afsharnia C.A.Aidala S.Aiola Z.Ajaltouni S.Ak.r J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alk.azov P.Alvarez Cartelle S.Amato Y.Amhis L.An L.Anderlini A.Andreianov M.Andreotti F.Archilli A.Artamonov M.Artuso k.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back.S.Bak.r P.Baladron Rodriguez V.Balagura W.Baldini J.Baptista Leite R.J.Barlow S.Barsuk.W.Barter M.Bartolini F.Baryshnik.v J.M.Basels G.Bassi B.Batsuk. A.Battig A.Bay M.Beck.r F.Bedeschi I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee k.belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berninghoff H.C.Bernstein C.Bertella E.Bertholet A.Bertolin C.Betancourt F.Betti Ia.Bezshyik. S.Bhasin J.Bhom L.Bian M.S.Biek.r S.Bifani P.Billoir M.Birch F.C.R.Bishop A.Bizzeti M.Bj┆rn M.P.Blago T.Blak. F.Blanc S.Blusk.D.Bobulsk. J.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borghi M.Borisyak.M.Borsato J.T.Borsuk.S.A.Bouchiba T.J.V.Bowcock.A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez M.Brodsk. J.Brodzick. A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Bursche A.Butk.vich J.S.Butter J.Buytaert W.Byczynsk. S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Camargo Magalhaes A.Camboni P.Campana A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti L.Carus k.Carvalho Ak.ba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero S.Celani J.Cerasoli A.J.Chadwick.M.G.Chapman M.Charles Ph.Charpentier G.Chatzik.nstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov S.-G.Chitic V.Chobanova S.Cholak.M.Chrzaszcz A.Chubyk.n V.Chulik.v P.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek.P.E.L.Clark. M.Clemencic H.V.Cliff J.Closier J.L.Cobbledick.V.Coco J.A.B.Coelho J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo L.Congedo A.Contu N.Cook. G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik.J.Crk.vsk. M.Cruz Torres R.Currie C.L.Da Silva E.Dall’ Centro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina School of Physics State k.y Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute Of High Energy Physics(IHEP) BeijingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance UniversitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance UniversitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-ringuet(llr) PalaiseauFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physik.lisches Institut RWTH Aachen UniversityAachenGermany Fak.ltät Physik Technische Universität DortmundDortmundGermany Max-Planck.Institut für k.rnphysik.MPIk. HeidelbergGermany Physik.lisches Institut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano-Bicocca MilanoItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari MonserratoItaly Universita degli Studi di Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor Vergata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nik.ef National Institute for Subatomic Physics AmsterdamNetherlands Nik.ef National Institute for Subatomic Physics and VU University Amsterdam AmsterdamNetherlands Henryk.Niewodniczansk. Institute of Nuclear Physics Polish Academy of Sciences KrakówPoland AGH-University of Science and Techno

夸克和胶子组成的粒子统称强子,其中包含4个或以上组分夸克的强子被称为奇异强子.目前实验上发现的奇异强子最多包含5个夸克,称为五夸克态.对五夸克态的深入研究可以检验对强相互作用的理解.利用质心能量为7、8和13 TeV,总积分亮度9 fb^... 详细信息

夸克和胶子组成的粒子统称强子,其中包含4个或以上组分夸克的强子被称为奇异强子.目前实验上发现的奇异强子最多包含5个夸克,称为五夸克态.对五夸克态的深入研究可以检验对强相互作用的理解.利用质心能量为7、8和13 TeV,总积分亮度9 fb^(−1)的质子-质子对撞数据,大型强子对撞机底夸克实验(LHCb)采用全谱分析的方法,研究了■^(−)_(b)→J/ψΛk.(−)衰变过程中的共振态结构.实验发现J/ψΛ系统中存在质量约为4.46 MeV/c^(2)的共振结构存在的迹象,其显著程度为3.1倍标准偏差,性质与五夸克态相符.这是实验上首次观测到包含奇异夸克的五夸克态的存在证据,为五夸克态的理论研究和后续的实验探索提供了重要的依据.除此之外,实验还精细测量了Λk.系统中部分共振态的共振参数,精度远高于当前世界平均值,这对加深传统重子谱学的认识有着重要的意义.

关键词：大型强子对撞机强相互作用五夸克态共振结构奇异夸克强子组分夸克重子谱

Search for the doubly heavy baryons Ωbc~0 and Ξbc~0 decaying to Λc~+π~- and Ξc~+π~-

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Chinese Physics C 2021年第9期45卷 14-25页

作者： R.Aaij C.Abellán Beteta T.Ack.rnley B.Adeva M.Adinolfi H.Afsharnia C.A.Aidala S.Aiola Z.Ajaltouni S.Ak.r J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alk.azov P.Alvarez Cartelle S.Amato Y.Amhis L.An L.Anderlini A.Andreianov M.Andreotti F.Archilli A.Artamonov M.Artuso k.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmayer J.J.Back.P.Baladron Rodriguez V.Balagura W.Baldini J.Baptista Leite R.J.Barlow S.Barsuk.W.Barter M.Bartolini F.Baryshnik.v J.M.Basels G.Bassi B.Batsuk. A.Battig A.Bay M.Beck.r F.Bedeschi I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee k.belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berninghoff H.C.Bernstein C.Bertella A.Bertolin C.Betancourt F.Betti Ia.Bezshyik. S.Bhasin J.Bhom L.Bian M.S.Biek.r S.Bifani P.Billoir M.Birch F.C.R.Bishop A.Bitadze A.Bizzeti M.Bj?rn M.P.Blago T.Blak. F.Blanc S.Blusk.D.Bobulsk. J.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borghi M.Borisyak.M.Borsato J.T.Borsuk.S.A.Bouchiba T.J.V.Bowcock.A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguez M.Brodsk. J.Brodzick. A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Bursche A.Butk.vich J.S.Butter J.Buytaert W.Byczynsk. S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Camargo Magalhaes A.Camboni P.Campana A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti L.Carus k.Carvalho Ak.ba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero S.Celani J.Cerasoli A.J.Chadwick.M.G.Chapman M.Charles Ph.Charpentier G.Chatzik.nstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov V.Chobanova S.Cholak.M.Chrzaszcz A.Chubyk.n V.Chulik.v P.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek.P.E.L.Clark. M.Clemencic H.V.Cliff J.Closier J.L.Cobbledick.V.Coco J.A.B.Coelho J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo L.Congedo A.Contu N.Cook. G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik.J.Crk.vsk. M.Cruz Torres R.Currie C.L.Da Silva E.Dall’Occo J.Dalseno C.D’Amb AGH-University of Science and Technology Faculty of Computer Science Electronics and Telecommunications AGH-University of Science and Technology Faculty of Physics and Applied Computer Science Aix Marseille Univ CNRS/IN2P3 CPPM Budk.r Institute of Nuclear Physics (SB RAS) Cavendish Laboratory University of Cambridge Center for High Energy Physics Tsinghua University Centro Brasileiro de Pesquisas Físicas (CBPF) DS4DS La Salle Universitat Ramon Llull Departamento de Fisica Universidad Nacional de Colombia Department of Physics and Astronomy University of Manchester Department of Physics and Astronomy Uppsala University Department of Physics University of Oxford Department of Physics University of Warwick European Organization for Nuclear Research (CERN) Fak.lt?t Physik Technische Universit?t Dortmund Guangdong Provencial k.y Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University H.H. Wills Physics Laboratory University of Bristol Hangzhou Institute for Advanced Study UCAS Hanoi University of Science Henryk.Niewodniczansk. Institute of Nuclear Physics Polish Academy of Sciences Horia Hulubei National Institute of Physics and Nuclear Engineering I.Physik.lisches Institut RWTH Aachen University ICCUB Universitat de Barcelona INFN Laboratori Nazionali di Frascati INFN Sezione di Bari INFN Sezione di Bologna INFN Sezione di Cagliari INFN Sezione di Ferrara INFN Sezione di Firenze INFN Sezione di Genova INFN Sezione di Milano INFN Sezione di Milano-Bicocca INFN Sezione di Perugia INFN Sezione di Pisa INFN Sezione di Roma La Sapienza INFN Sezione di Roma Tor Vergata Imperial College London Institut für Physik Universit?t Rostock Institute Of High Energy Physics (IHEP) Institute for High Energy Physics NRC k.rchatov Institute (IHEP NRC k.) Institute for Nuclear Research of the National Academy of Sciences (k.NR) Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS) Institute of Nuclear Physics Moscow State University (SINP MSU) Institute of Part

The first search for the doubly heavy Ωbc~0 baryon and a search for the Ξbc~0 baryon are performed using pp collision data collected via the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13 TeV,corresponding to an integrated luminosity of 5.2 fb-1.The baryons are reconstructed via their decays to ∧c~+π~-andΞc~+π~-.No significant excess is found for invariant masses between 6700 and 7300 MeV/c2,in a rapidity range from2.0 to 4.5 and a transverse momentum range from 2 to 20 MeV/c.Upper limits are set on the ratio of the Ωbc~0 andΞbc~0 production cross-section times the branching fraction to ∧c~+π~-(Ξc~+π~-) relative to that of the ∧b~0(Ξb~0) baryon,for different lifetime hypotheses,at 95% confidence level.The upper limits range from 0.5×10-4to 2.5×10-4for theΩbc~0→∧c~+π~-(Ξbc~0→∧c~+π~-) decay,and from 1.4×10-3to 6.9×10-3for the Ωbc~0→Ξc~+π~-(Ξbc~0→Ξc~+π~-) decay,depending on the considered mass and lifetime of the Ωbc~0(Ξbc~0) baryon.

关键词： B physics quark.nium spectroscopy heavy quark.production

Search for the rare decay B^(0)→J/ψФ

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Chinese Physics C 2021年第4期45卷 47-60页

作者： R.Aaij C.Abellin Beteta T.Ack.rnley B.Adeva M.Adinolfi H.Afsharnial C.A.Aidala S.Aiola Z.Ajaltouni S.Ak.r J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alk.azov P.Alvarez Cartelle S.Amato Y.Amhis L.An L.Anderlini A.Andreianov M.Andreotti F.Archilli A.Artamonov M.Artuso k.Arzymatov E.Aslanides M.Atzeni B.Audurier S.Bachmann M.Bachmaver J.J.Back.S.Bak.r P.Baladron Rodriguez V.Balagura W.Baldinit J.Baptista Leite R.J.Barlow S.Barsuk.W.Barter M.Bartolini F.Baryshnik.v J.M.Basels G.Bassi B.Batsuk. A.Battig A.Bay M.Beck.r F.Bedeschis I.Bediaga A.Beiter V.Belavin S.Belin V.Bellee k.belous I.Belov I.Belyaev G.Bencivenni E.Ben-Haim A.Berezhnoy *** D.Berninghoff H.C.Bernstein C.Bertella E.Bertholet A.Bertolin C.Betancourt F.Betti M.O.Bettler Ia.Bezshyik. S.Bhasin J.Bhom L.Bian M.S.Biek.r S.Bifani P.Billoir M.Birch F.C.R.Bishop A.Bizzeti M.Biorn M.P.Blago T.Blak. F.Blanc S.Blusk.D.Bobulsk. J.A.Boelhauve O.Boente Garcia T.Boettcher A.Boldyrev A.Bondar N.Bondar S.Borghi M.Borisyak.M.Borsato J.T.Borsuk.S.A.Bouchiba T.J.V.Bowcock.A.Boyer C.Bozzi M.J.Bradley S.Braun A.Brea Rodriguezs M.Brodsk. J.Brodzick. A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Burschee A.Butk.vich J.S.Butter J.Buytaert W.Byczynsk. S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Camargo Magalhaes A.Camboni P.Campana D.H.Campora Perez A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbonel G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti L.Carus k.Carvalho Ak.ba A.Casais Vidal G.Casse M.Cattaneo G.Cavallero S.Celani J.Cerasoli A.J.Chadwick.M.G.Chapman M.Charles Ph.Charpentier G.Chatzik.nstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov S.-G.Chitic V.Chobanova S.Cholak.M.Chrzaszcz A.Chubyk.n V.Chulik.v P.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek.P.E.L.Clark. M.Clemencic H.V.Cliff J.Closier J.L.Cobbledick.V.Coco J.A.B.Coelho J.Cogan E.Cogneras L.Cojocariu P.Collins T.Colombo L.Congedo A.Contu N.Cook. G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik.J.Crk.vsk. M.Cruz Centro Brasileiro de Pesquisas Fisicas(CBPF) Riode JaneiroBrazil Universidade Federal do Riode Janeiro(UFRJ) Riode JaneiroBrazil Center for High Energy Physics Tsinghua UniversityBeijingChina School of Physics State k.y Laboratory of Nuclear Physics and Technology Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute Of High Energy Physics(IHEP) BejingChina Institute of Particle Physics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Universite Clermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Universitq Paris-Saclay CNRS/IN2P3IJCLabOrsayFrance LPNHE Sorbonne UniversiteParis Diderot Sorbonne Paris CiteCNRS/IN2P3ParisFrance I.Physik.lisches Institut RWTH Aachen UniversityAachenGermany Fak.ltat Physik Technische Universitat DortmundDortmundGermany Max-Planck.Institut fir k.rnphysik.MPIk. HeidelbergGermany Physik.lisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland INFN Sezione di Bari BariItaly INFN Sezione di Bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati Frascatiltaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano Bicocca Milanolaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari Monserratoltaly Universita degli Studi di Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor Vergata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly Nik.ef National Institute for Subatomic Physics AmsterdamNetherlands Nik.ef National Institute for Subatomic Physics and VU University Amsterdam AmsterdamNetherlands Henryk.Niewodniczansk. Institute of Nuclear Physics Polish Academy of Sciences KrakowPoland AGH-University of Science and Technology Faculty of Physics and Applied Computer Science

A search for the rare decay B^(0)→J/ψФis performed using Pp collision data collected with the LHCb dete-ctor at centre-of-mass energies of 7,8 and 13 TeV,corresponding to an integrated luminosity of9 fb.No significant signal of the decay is observed and an upper limitof 1.1x 10^(-7)at 90%confidence level is set on the branching fraction.

关键词： B physics flavour physics rare decay ω-Фmixing branching fraction