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STCf conceptual design report (volume 1): Physics & detector

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frontiers of physics 2024年第1期19卷 1-154页

作者： M.Achasov X.C.Ai L.P.An R.Aliberti Q.An X.Z.Bai Y.Bai O.Bakina A.Barnyakov v.Blinov v.Bobrovnikov D.Bodrov A.Bogomyagkov A.Bondar I.Boyko Z.H.Bu f.M.Cai H.Cai J.J.Cao Q.H.Cao X.Cao Z.Cao Q.Chang K.T.Chao D.Y.Chen H.Chen H.X.Chen J.f.Chen K.Chen L.L.Chen P.Chen S.L.Chen S.M.Chen S.Chen S.P.Chen W.Chen X.Chen X.f.Chen X.R.Chen Y.Chen Y.Q.Chen H.Y.Cheng J.Cheng S.Cheng T.G.Cheng J.P.Dai L.Y.Dai X.C.Dai D.Dedovich A.Denig I.Denisenko J.M.Dias D.Z.Ding L.Y.Dong W.H.Dong v.Druzhinin D.S.Du Y.J.Du Z.G.Du L.M.Duan D.Epifanov Y.L.fan S.S.fang Z.J.fang G.fedotovich C.Q.feng X.feng Y.T.feng J.L.fu J.Gao Y.N.Gao P.S.Ge C.Q.Geng L.S.Geng A.Gilman L.Gong T.Gong B.Gou W.Gradl J.L.Gu A.Guevara L.C.Gui A.Q.Guo f.K.Guo J.C.Guo J.Guo Y.P.Guo Z.H.Guo A.Guskov K.L.Han L.Han M.Han X.Q.Hao J.B.He S.Q.He X.G.He Y.L.He Z.B.He Z.X.Heng B.L.Hou T.J.Hou Y.R.Hou C.Y.Hu H.M.Hu K.Hu R.J.Hu W.H.Hu X.H.Hu Y.C.Hu J.Hua G.S.Huang J.S.Huang M.Huang Q.Y.Huang W.Q.Huang X.T.Huang X.J.Huang Y.B.Huang Y.S.Huang N.Hüsken v.Ivanov Q.P.Ji J.J.Jia S.Jia Z.K.Jia H.B.Jiang J.Jiang S.Z.Jiang J.B.Jiao Z.Jiao H.J.Jing X.L.Kang X.S.Kang B.C.Ke M.Kenzie A.Khoukaz I.Koop E.kravchenko A.Kuzmin Y.Lei E.Levichev C.H.Li C.Li D.Y.Li f.Li G.Li G.Li H.B.Li H.Li H.N.Li H.J.Li H.L.Li J.M.Li J.Li L.Li L.Li L.Y.Li N.Li P.R.Li R.H.Li S.Li T.Li W.J.Li X.Li X.H.Li X.Q.Li X.H.Li Y.Li Y.Y.Li Z.J.Li H.Liang J.H.Liang Y.T.Liang G.R.Liao L.Z.Liao Y.Liao C.X.Lin D.X.Lin X.S.Lin B.J.Liu C.W.Liu D.Liu f.Liu G.M.Liu H.B.Liu J.Liu J.J.Liu J.B.Liu K.Liu K.Y.Liu K.Liu L.Liu Q.Liu S.B.Liu T.Liu X.Liu Y.W.Liu Y.Liu Y.L.Liu Z.Q.Liu Z.Y.Liu Z.W.Liu I.Logashenko Y.Long C.G.Lu J.X.Lu N.Lu Q.f.Lü Y.Lu Y.Lu Z.Lu P.Lukin f.J.Luo T.Luo X.f.Luo Y.H.Luo H.J.Lyu X.R.Lyu J.P.Ma P.Ma Y.Ma Y.M.Ma f.Maas S.Malde D.Matvienko Z.X.Meng R.Mitchell A.Nefediev Y.Nefedov S.L.Olsen Q.Ouyang P.Pakhlov G.Pakhlova X.Pan Y.Pan E.Passemar Y.P.Pei H.P.Peng L.Peng X.Y.Peng X.J.Peng K.Peters S.Pivovarov E.Pyata B.B.Qi Y.Q.Qi W.B.Qian Y.Qian C.f.Qiao J.J.Qin J.J.Qin L.Q.Qin X.S.Qin T.L.Qiu J.Rademacker C.f.Redmer H.Y.Sang Anhui University Hefei 230039China Beihang University Beijing 100191China Budker Institute of Nuclear Physics Novosibirsk 630090Russia CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Cavendish Laboratory University of CambridgeJJ Thomson AveCambridge CB30HEUnited Kingdom Central China Normal University Wuhan 430079China Central South University Changsha 410083China China University of Geosciences Wuhan 430074China China University of Mining and Technology Xuzhou 221116China École Polytechnique fédérale de Lausanne(EPfL) LausanneSwitzerland fudan University Shanghai 200433China Goethe University frankfurt D-60325 Frankfurt am MainGermany Guangxi Normal University Guilin 541004China Guangxi Uninversity Nanning 530004China Hangzhou Institute for Advanced Study UCASHangzhou 310024China Hebei Normal University Shijiazhuang 050024China Hebei University Baoding 071002China Hefei University of Technology Hefei 230601China Helmholtz Institute Mainz Staudinger Weg 18D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University Kaifeng 475004China High Energy Physics Center Chung-Ang UniversitySeoul 06974Korea Higher School of Economy 11 Pokrovsky Bulvar Moscow 109028Russia Huangshan University Huangshan 245000China Hubei University of Automotive Technology Shiyan 442002China Hunan Normal University Changsha 410081China Hunan University of Science and Technology Xiangtan 411201China Hunan University Changsha 410082China Indiana University BloomingtonIndiana 47405USA Inner Mongolia University Hohhot 010021China Institute of Advanced Science facilities Shenzhen 518107China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Institute of Physics Academia SinicaTaipeiTaiwan 11529China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China Jilin University Changch

The superτ-charm facility(STCf)is an electron–positron collider proposed by the Chinese particle physics *** is designed to operate in a center-of-mass energy range from 2 to 7 Gev with a peak luminosity of 0.5×10^(35) cm^(–2)·s^(–1) or *** STCf will produce a data sample about a factor of 100 larger than that of the presentτ-charm factory—the BEPCII,providing a unique platform for exploring the asymmetry of matter-antimatter(charge-parity violation),in-depth studies of the internal structure of hadrons and the nature of non-perturbative strong interactions,as well as searching for exotic hadrons and physics beyond the Standard *** STCf project in China is under development with an extensive R&D *** document presents the physics opportunities at the STCf,describes conceptual designs of the STCf detector system,and discusses future plans for detector R&D and physics case studies.

关键词： electron–positron collider tau-charm region high luminosity STCf detector conceptual design

Machine learning-based method to adjust electron anomalous conductivity profile to experimentally measured operating parameters of Hall thruster

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Plasma Science and Technology 2022年第6期24卷 148-156页

作者： Andrey SHASHKOv Mikhail TYUSHEv Alexander LOvTSOv Dmitry TOMILIN Dmitrii kravchenko JSC'Keldysh Research Center' 8 Onezhskaya St.Moscow 125438Russia

The problem of determining the electron anomalous conductivity profile in a Hall thruster,when its operating parameters are known from the experiment,is *** solve the problem,we propose varying the parametrically set anomalous conductivity profile until the calculated operating parameters match the experimentally measured ones in the best *** axial 1D3v hybrid model was used to calculate the operating parameters with parametrically set *** of the conductivity profile was performed using Bayesian optimization with a Gaussian process(machine learning method),which can resolve all local minima,even for noisy *** calculated solution corresponding to the measured operating parameters of a Hall thruster in the best way proved to be unique for the studied operating modes of *** local plasma parameters were calculated and compared to the measured ones for four different operating *** results show the qualitative *** agreement between calculated and measured local parameters can be improved with a more accurate model of plasma-wall interaction.

关键词： Hall thruster anomalous conductivity machine learning Bayesian optimization Gaussian process electric propulsion

Grouting of Waste of the Baikal Pulp and Paper Mill to Reduce the Technogenic Impact to the Baikal Lake Ecosystem

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Journal of Geoscience and Environment Protection 2020年第11期8卷 112-118页

作者： Eugene N. Samarin Nataliia S. kravchenko Oleg v. Zerkal Michael S. Chernov Irina A. Rodkina Geological faculty Lomonosov Moscow State University Moscow Russia

Research is devoted to the problem of recycling waste of the Baikal Pulp and Paper Mill, whose activity has caused serious damage to the ecological environment of Lake Baikal and its environs. Grouting waste production is currently the most effective possible decision to the problem of pollutants, such as sludge-lignin and ash, in water objects and groundwater. The results on the grouting of liquid and solid waste from the Baikal Pulp and Paper Mill, represented by sludge lignin and ash, are presented. Cement, liquid glass, colloidal silica, ammonium persulfate, hydrogen peroxide were used as the main hardeners. Samples were formed by mixing the original waste with astringent. The strength in time, shrinkage, resistance to water were studied. Samples formed on the basis of colloidal silica solution have a maximum uniaxial compressive strength of 0.4 - 0.5 MPa, on the basis of liquid glass—0.2 - 0.3 MPa. Adding fine sand increases the strength by 1.5 - 1.7 times. Samples based on ammonium persulfate and hydrogen peroxide do not have sufficient strength. Adding fine quartz sand increases the strength up to 1.0 - 1.2 MPa.

关键词： Grouting Sludge-Lignin Colloidal Silica Liquid Glass Pollution of Lake Baikal

Recent results from the KEDR detector

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Chinese Physics C 2010年第6期34卷 650-655页

作者： v.v.Anashin v.M.Aulchenko E.M.Baldin A.K.Barladyan A.Yu.Barnyakov M.Yu.Barnyakov S.E.Baru I.v.Bedny O.L.Beloborodova A.E.Blinov v.E.Blinov A.v.Bobrov v.S.Bobrovnikov A.v.Bogomyagkov A.E.Bondar A.R.Buzykaev S.I.Eidelman Yu.M.Glukhovchenko v.v.Gulevich D.v.Gusev S.E.Karnaev S.v.Karpov T.A.Kharlamova v.A.Kiselev S.A.Kononov K.Yu.Kotov E.A.kravchenko v.f.Kulikov G.Ya.Kurkin E.A.Kuper E.B.Levichev D.A.Maksimov v.M.Malyshev A.L.Maslennikov A.S.Medvedko O.I.Meshkov S.I.Mishnev I.I.Morozov N.Yu.Muchnoi v.v.Neufeld S.A.Nikitin I.B.Nikolaev I.N.Okunev A.P.Onuchin S.B.Oreshkin I.O.Orlov A.A.Osipov S.v.Peleganchuk S.G.Pivovarov P.A.Piminov v.v.Petrov A.O.Poluektov I.N.Popkov v.G.Prisekin A.A.Ruban v.K.Sandyrev G.A.Savinov A.G.Shamov D.N.Shatilov B.A.Shwartz E.A.Simonov S.v.Sinyatkin Yu.I.Skovpen A.N.Skrinsky v.v.Smaluk A.v.Sokolov A.M.Sukharev E.v.Starostina A.A.Talyshev v.A.Tayursky v.I.Telnov Yu.A.Tikhonov K.Yu.Todyshev G.M.Tumaikin Yu.v.Usov A.I.vorobiov A.N.Yushkov v.N.Zhilich v.v.Zhulanov A.N.Zhuravlev Budker Institute of Nuclear Physics Novosibirsk State University Novosibirsk State Technical University 20Karl Marx prospectNovosibirsk630092Russia

We report results of experiments performed with the KEDR detector at the vEPP-4M e^＋e^- collider. They include precise measurement of the D^0 and D^± meson masses, determination of the ψ（3770） resonance parameter... 详细信息

关键词： D meson ψ(3770) mass narrow resonances

Measurement of J/ψ→η_cγ at KEDR

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Chinese Physics C 2010年第6期34卷 831-835页

作者： v.v.Anashin v.M.Aulchenko E.M.Baldin A.K.Barladyan A.Yu.Barnyakov M.Yu.Barnyakov S.E.Baru I.v.Bedny O.L.Beloborodova A.E.Blinov v.E.Blinov A.v.Bobrov v.S.Bobrovnikov A.v.Bogomyagkov A.E.Bondar A.R.Buzykaev S.I.Eidelman Yu.M.Glukhovchenko v.v.Gulevich D.v.Gusev S.E.Karnaev G.v.Karpov S.v.Karpov T.A.Kharlamova v.A.Kiselev S.A.Kononov K.Yu.Kotov E.A.kravchenko v.f.Kulikov G.Ya.Kurkin E.A.Kuper E.B.Levichev D.A.Maksimov v.M.Malyshev A.L.Maslennikov A.S.Medvedko O.I.Meshkov A.I.Milstein S.I.Mishnev I.I.Morozov N.Yu.Muchnoi v.v.Neufeld S.A.Nikitin I.B.Nikolaev I.N.Okunev A.P.Onuchin S.B.Oreshkin I.O.Orlov A.A.Osipov S.v.Peleganchuk S.G.Pivovarov P.A.Piminov v.v.Petrov A.O.Poluektov I.N.Popkov G.E.Pospelov v.G.Prisekin A.A.Ruban v.K.Sandyrev G.A.Savinov A.G.Shamov D.N.Shatilov B.A.Shwartz E.A.Simonov S.v.Sinyatkin Yu.I.Skovpen A.N.Skrinsky v.v.Smaluk A.v.Sokolov A.M.Sukharev E.v.Starostina A.A.Talyshev v.A.Tayursky v.I.Telnov Yu.A.Tikhonov K.Yu.Todyshev G.M.Tumaikin Yu.v.Usov A.I.vorobiov A.N.Yushkov v.N.Zhilich v.v.Zhulanov A.N.Zhuravlev Budker Institute of Nuclear Physics Novosibirsk State University Novosibirsk State Technical University

We present a study of the inclusive photon spectra from 5.9 million J/ψ decays collected with the KEDR detector at the vEPP-4M e＋e collider. We measure the branching fraction of radiative decay J/ψ→ηcγ, ηc width and mass. Our preliminary results are： M（ηc） = 2979.4± 1.5 ± 1.9 Mev/c^2, Г（ηc） = 27.8±5.1 ±3.3 Mev, B（Jψ→ηcγ） = （2.34±0.15±0.40）%.

关键词： ηc meson full width mass radiative decay

Isolation and Identification of Pseudo Seven-Coordinate Ru(Ⅲ)Intermediate Completing the Catalytic Cycle of Ru-bda Type of Water Oxidation Catalysts

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CCS Chemistry 2022年第7期4卷 2481-2490页

作者： Tianqi Liu Ge Li Nannan Shen Linqin Wang Brian J.J.Timmer Shengyang Zhou Biaobiao Zhang Alexander kravchenko Bo Xu Marten S.G.Ahlquist Licheng Sun Department of Chemistry School of Engineering Sciences in ChemistryBiotechnologyand HealthKTH Royal Institute of TechnologyStockholm 10044 Department of Theoretical Chemistry and Biology School of Engineering Sciences in ChemistryBiotechnologyand HealthKTH Royal Institute of TechnologyStockholm 10691 State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123 Center of Artificial Photosynthesis for Solar fuels School of ScienceWestlake UniversityHangzhou 310024 Nanotechnology and functional Materials Department of Materials Sciences and EngineeringThe Angstrom LaboratoryUppsala UniversityUppsala 75103 Institute of Artificial Photosynthesis(IAP) State Key Laboratory of Fine ChemicalsDalian University of Technology(DUT)Dalian 116024

Isolation of RuⅢ-bda(17-electron specie)complex with an aqua ligand(2-electron donor)is challenging due to violation of the 18-electron *** considerable efforts have been dedicated to mechanistic studies of water oxidation by the Ru-bda family,the structure and initial formation of the Ru^(Ⅲ)-bda aqua complex are still ***,we challenge this often overlooked step by designing a pocketshape Ru-based complex *** computational studies showed that 1 possesses the crucial hydrophobicity at the Ru^(v)(O)state as well as similar probability of access of terminal O to solvent water molecules when compared with classic Ru-bda *** characterization of single-crystal structures at the Ru^(Ⅱ) and Ru^(Ⅲ) states,a pseudo seven-coordinate“ready-togo”aqua ligand with Ru^(Ⅲ)…O distance of 3.62A was *** aqua ligand was also found to be part of a formed hydrogen-bonding network,providing a good indication of how the Ru^(Ⅲ)-OH_(2)complex is formed.

关键词： Ru-bda water oxidation pseudo seven-coordinate Ru^(Ⅲ)-OH_(2)intermediate water preorganization

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窗里·窗外

现代装饰（家居） 2016年第7期 114-121页

作者： smarin Kodama Zomes DEESAWAT Ethimo Alki B&v Alain Gilles kravchenko Artem&Julia Kononenko Agata Nowak Evangeline Pesigan 李薇范嘉苑 Note Design Studio

记得女作家迟子建在她的散文《窗里窗外的世界》中有这样写道过：好的读书环境应该是和自然环境联系在一起的,窗里与窗外的世界有时是隔绝的,有时又是相互联系的,我们在窗里读书,在窗外阅读这个城市,窗里窗外的生活都是不可或缺的。

关键词：迟子建开窗读书环境给你自然清新私密性家具产品户外家具现代风格承重能力

Evidence of a J/ψΛstructure and observation of excited■^(-)states in the■b^(-)→J/ψΛK^(-) decay

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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.Ackernley B.Adeva M.Adinolfi H.Afsharnia C.A.Aidala S.Aiola Z.Ajaltouni S.Akar J.Albrecht f.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov 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.Baker P.Baladron Rodriguez v.Balagura W.Baldini J.Baptista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolini f.Baryshnikov J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker 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.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bifani P.Billoir M.Birch f.C.R.Bishop A.Bizzeti M.Bj┆rn M.P.Blago T.Blake f.Blanc S.Blusk D.Bobulska 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.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczynski 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 Akiba A.Casais vidal G.Casse M.Cattaneo G.Cavallero S.Celani J.Cerasoli A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov S.-G.Chitic v.Chobanova S.Cholak M.Chrzaszcz A.Chubykin v.Chulikov P.Ciambrone M.f.Cicala X.Cid vidal G.Ciezarek P.E.L.Clarke 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.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovská 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 Key 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.Physikalisches Institut RWTH Aachen UniversityAachenGermany fakultät Physik Technische Universität DortmundDortmundGermany Max-Planck-Institut für Kernphysik(MPIK) HeidelbergGermany Physikalisches 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 Nikhef National Institute for Subatomic Physics AmsterdamNetherlands Nikhef National Institute for Subatomic Physics and vU University Amsterdam AmsterdamNetherlands Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences KrakówPoland AGH-University of Science and Techno

first evidence of a structure in the J/ψΛinvariant mass distribution is obtained from an amplitude analysis of■b^(-)J/ψΛK^(-)*** observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1r including systematic uncertainties and lookelsewhere *** mass and width are determined to be 4458:8±2:9t4:7-1:1 Mev and 17:3±6:5t8:0-5:7 Mev,respectively,where the quoted uncertainties are statistical and *** structure is also consistent with being due to two *** addition,the narrow excited■^(-)states,N■(1690)and■(1820),are seen for the first time in a■b^(-)decay,and their masses and widths are measured with improved *** analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb^(-1),collected with the LHCb experiment at centre-of-mass energies of 7,8 and 13 Tev.

关键词： QCD Exotics Pentaquark Spectroscopy Quarkonium Particle and resonance production

Search for the doubly heavy baryons Ωbc0 and Ξbc0 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.Ackernley B.Adeva M.Adinolfi H.Afsharnia C.A.Aidala S.Aiola Z.Ajaltouni S.Akar J.Albrecht f.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov 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.Baryshnikov J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker 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.Bezshyiko S.Bhasin J.Bhom L.Bian M.S.Bieker S.Bifani P.Billoir M.Birch f.C.R.Bishop A.Bitadze A.Bizzeti M.Bj?rn M.P.Blago T.Blake f.Blanc S.Blusk D.Bobulska 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.Brodski J.Brodzicka A.Brossa Gonzalo D.Brundu A.Buonaura C.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczynski 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 Akiba A.Casais vidal G.Casse M.Cattaneo G.Cavallero S.Celani J.Cerasoli A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier G.Chatzikonstantinidis C.A.Chavez Barajas M.Chefdeville C.Chen S.Chen A.Chernov v.Chobanova S.Cholak M.Chrzaszcz A.Chubykin v.Chulikov P.Ciambrone M.f.Cicala X.Cid vidal G.Ciezarek P.E.L.Clarke 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.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovská M.Cruz Torres R.Currie C.L.Da Silva E.Dall'Occo J.Dalseno C.D'Amb University of Edinburgh Horia Hulubei National Institute of Physics and Nuclear Engineering INfN Sezione di Bari Università di Bari Los Alamos National Laboratory (LANL) van Swinderen Institute University of Groningen Universiteit Maastricht AGH-University of Science and Technology faculty of Physics and Applied Computer Science Université Clermont Auvergne Università di Cagliari Institute for Nuclear Research of the National Academy of Sciences (KINR) School of Physics University College Dublin NSC Kharkiv Institute of Physics and Technology (NSC KIPT) INfN Sezione di Perugia STfC Rutherford Appleton Laboratory School of Physics and Astronomy Monash University Novosibirsk State University CNRS/IN2P3 Department of Physics and Astronomy Uppsala University Università di Genova School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University National Center for Nuclear Research (NCBJ) Università di Roma Tor vergata Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) Universidade federal do Triangulo Mineiro (UfTM) Institute of Particle Physics LPC Central China Normal University Hangzhou Institute for Advanced Study UCAS Instituto de fisica Corpuscular Centro Mixto Universidad de valencia-CSIC Nikhef National Institute for Subatomic Physics and vU University Amsterdam National Research Tomsk Polytechnic University AGH-University of Science and Technology faculty of Computer Science Electronics and Telecommunications University of Michigan Università di Siena Università di Padova Scuola Normale Superiore National Research Centre Kurchatov Institute Università degli Studi di Milano MSU-Iligan Institute of Technology (MSU-IIT) Università di firenze INfN Sezione di Roma La Sapienza Institut für Physik Universit?t Rostock INfN Sezione di Milano Departamento de fisica Universidad Nacional de Colombia Universit?t Bonn-Helmholtz-Institut für Strahlen und Kernphysik Hanoi University of Science Università di Pisa P.N. Lebedev Physical Institute Russian Academy of Science (LPI RAS) Università

The first search for the doubly heavy Ωbc0baryon and a search for the Ξbc0baryon 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 *** 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/*** limits are set on the ratio of the Ωbc0andΞbc0production cross-section times the branching fraction to ∧c+π-（Ξc+π-） relative to that of the ∧b0（Ξb0） baryon,for different lifetime hypotheses,at 95% confidence *** upper limits range from 0.5×10-4to 2.5×10-4for theΩbc0→∧c+π-(Ξbc0→∧c+π-) decay,and from 1.4×10-3to 6.9×10-3for the Ωbc0→Ξc+π-(Ξbc0→Ξc+π-) decay,depending on the considered mass and lifetime of the Ωbc0(Ξbc0) baryon.

关键词： B physics quarkonium spectroscopy heavy quark production