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Study of BESIII trigger efficiencies with the 2018 J/ψ data 被引量:36
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作者 M.Ablikim M.N.Achasov +150 位作者 P.Adlarson S.Ahmed M.Albrecht R.Aliberti A.Amoroso M.R.An q.An X.H.Bai Y.Bai O.Bakina R.Baldini Ferroli I.Balossino Y.Ban K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi j.Bloms A.Bortone I.Boyko R.A.Briere H.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin j.F.Chang W.L.Chang G.Chelkov D.Y.Chen G.Chen H.S.Chen M.L.Chen S.j.Chen X.R.Chen Y.B.Chen Z.j Chen W.S.Cheng G.Cibinetto F.Cossio X.F.Cui H.L.Dai X.C.Dai A.Dbeyssi R.E.de Boer D.Dedovich Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori Y.Ding C.Dong j.Dong L.Y.Dong M.Y.Dong X.Dong S.X.Du Y.L.Fan j.Fang S.S.Fang Y.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.q.Feng j.H.Feng M.Fritsch C.D.Fu Y.Gao Y.Gao Y.Gao Y.G.Gao I.Garzia P.T.Ge C.Geng E.M.Gersabeck A Gilman K.Goetzen L.Gong W.X.Gong W.Gradl M.Greco L.M.Gu M.H.Gu S.Gu Y.T.Gu C.Y Guan A.q.Guo L.B.Guo R.P.Guo Y.P.Guo A.Guskov T.T.Han W.Y.Han X.q.Hao F.A.Harris H Hüsken K.L.He F.H.Heinsius C.H.Heinz T.Held Y.K.Heng C.Herold M.Himmelreich T.Holtmann Y.R.Hou Z.L.Hou H.M.Hu j.F.Hu T.Hu Y.Hu G.S.Huang L.q.Huang X.T.Huang Y.P.Huang Z.Huang T.Hussain W.Ikegami Andersson W.Imoehl M.Irshad S.jaeger S.janchiv q.ji q.P.ji X.B.ji X.L.ji H.B.jiang X.S.jiang j.B.jiao Z.jiao S.jin Y.jin T.johansson N.Kalantar-Nayestanaki X.S.Kang R.Kappert M.Kavatsyuk B.C.Ke I.K.Keshk A.Khoukaz P.Kiese R.Kiuchi R.Kliemt L.Koch O.B.Kolcu B.Kopf M.Kuemmel 《Chinese Physics C》 SCIE CAS CSCD 2021年第2期48-55,共8页
Using a dedicated data sample taken in 2018 on the J/ψpeak,we perform a detailed study of the trigger efficiencies of the BESIII detector.The efficiencies are determined from three representative physics processes,na... Using a dedicated data sample taken in 2018 on the J/ψpeak,we perform a detailed study of the trigger efficiencies of the BESIII detector.The efficiencies are determined from three representative physics processes,namely Bhabha scattering,dimuon production and generic hadronic events with charged particles.The combined efficiency of all active triggers approaches 100%in most cases,with uncertainties small enough not to affect most physics analyses. 展开更多
关键词 BESIII trigger efficiency Bhabha dimuon hadronic events
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The Lobster Eye Imager for Astronomy Onboard the SATech-01 Satellite 被引量:2
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作者 Z.X.ling X.j.Sun +123 位作者 C.Zhang S.L.Sun G.jin S.N.Zhang X.F.Zhang j.B.Chang F.S.Chen Y.F.Chen Z.W.Cheng W.Fu Y.X.Han H.li j.F.li Y.li Z.D.li P.R.liu Y.H.Lv X.H.Ma Y.j.Tang C.B.Wang R.j.Xie Y.L.Xue A.L.Yan q.Zhang C.Y.Bao H.B.Cai H.q.Cheng C.Z.Cui Y.F.Dai D.W.Fan H.B.Hu j.W.Hu M.H.Huang Z.q.jia C.C.jin D.Y.li j.q.li H.Y.liu M.j.liu Y.liu H.W.Pan Y.L.qiu M.Sugizaki H.Sun W.X.Wang Y.L.Wang q.Y.Wu X.P.Xu Y.F.Xu H.N.Yang X.Yang B.Zhang M.Zhang W.D.Zhang Z.Zhang D.H.Zhao X.q.Cong B.W.jiang L.H.li X.B.qiu j.N.Sun D.T.Su j.Wang C.Wu Z.Xu X.M.Yang S.K.Zhang Z.Zhang N.Zhang Y.F.Zhu H.Y.Ban X.Z.Bi Z.M.Cai W.Chen X.Chen Y.H.Chen Y.Cui X.L.Duan Z.G Feng Y.Gao j.W.He T.He j.j.Huang F.li j.S.li T.j.li T.T.li H.q.liu L.liu R.liu S.liu N.Meng q.Shi A.T.Sun Y.M.Wang Y.B.Wang H.C.Wu D.X Xu Y.q Yang Y.Yang X.S.Yu K.X.Zhang Y.L.Zhang Y.H.Zhang Y.T.Zhang H.Zhou X.C.Zhu j.S.Cheng L.qin L.Wang q.L.Wang M.Bai R.L.Gao Z.ji Y.R.liu F.L.Ma Y.j.Shi j.Su Y.Y.Tan j.Z.Tong H.T.Xu C.B.Xue G.F.Xue W.Yuan 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2023年第9期66-78,共13页
The Lobster Eye Imager for Astronomy(LEIA),a pathfinder of the Wide-field X-ray Telescope of the Einstein Probe mission,was successfully launched onboard the SATech-01 satellite of the Chinese Academy of Sciences on20... The Lobster Eye Imager for Astronomy(LEIA),a pathfinder of the Wide-field X-ray Telescope of the Einstein Probe mission,was successfully launched onboard the SATech-01 satellite of the Chinese Academy of Sciences on2022 July 27.In this paper,we introduce the design and on-ground test results of the LEIA instrument.Using stateof-the-art Micro-Pore Optics(MPO),a wide field of view of 346 square degrees(18.6°×18.6°)of the X-ray imager is realized.An optical assembly composed of 36 MPO chips is used to focus incident X-ray photons,and four large-format complementary metal-oxide semiconductor(CMOS)sensors,each of size 6 cm×6 cm,are used as the focal plane detectors.The instrument has an angular resolution of 4’-8’(in terms of FWHM)for the central focal spot of the point-spread function,and an effective area of 2-3 cm^(2) at 1 keV in essentially all the directions within the field of view.The detection passband is 0.5-4 keV in soft X-rays and the sensitivity is2-3×10^(-11) erg s^(-1) cm^(-2)(about 1 milliCrab)with a 1000 s observation.The total weight of LEIA is 56 kg and the power is 85 W.The satellite,with a design lifetime of 2 yr,operates in a Sun-synchronous orbit of 500 km with an orbital period of 95 minutes.LEIA is paving the way for future missions by verifying in flight the technologies of both novel focusing imaging optics and CMOS sensors for X-ray observation,and by optimizing the working setups of the instrumental parameters.In addition,LEIA is able to carry out scientific observations to find new transients and to monitor known sources in the soft X-ray band,albeit with limited useful observing time available. 展开更多
关键词 instrumentation detectors-space vehicles instruments-telescopes-X-rays GENERA
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Observations of the Cabibbo-Suppressed decays Λ_(c)^(+)→nπ+π^(0),nπ^(+)π^(-)π^(+) and the Cabibbo-Favored decay Λ_(c)^(+)→nK^(-)π^(+)π^(+)
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作者 麦迪娜 M.N.Achasov +140 位作者 P.Adlarson M.Albrecht R.Aliberti A.Amoroso 安美儒 安琪 白羽 O.Bakina R.Baldini Ferroli I.Balossino 班勇 V.Batozskaya D.Becker K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi E.Bianco j.Bloms A.Bortone I.Boyko R.A.Briere A.Brueggemann 蔡浩 蔡啸 A.Calcaterra 曹国富 曹宁 S.A.Cetin 常劲帆 常万玲 车国荣 G.Chelkov 陈琛 陈超 陈刚 陈和生 陈玛丽 陈申见 陈少敏 T.Chen 陈旭荣 X.T.Chen 陈元柏 陈卓俊 成伟帅 S.K.Choi 初晓 G.Cibinetto F.Cossio 崔佳佳 代洪亮 代建平 A.Dbeyssi R.Ede Boer D.Dedovich 邓子艳 A.Denig I.Denysenko M.Destefanis F.De Mori 丁勇 丁逸 董静 董燎原 董明义 董翔 杜书先 段宗欢 P.Egorov 范玉兰 方建 房双世 方文兴 方易 R.Farinelli L.Fava F.Feldbauer G.Felici 封常青 冯俊华 K Fischer M.Fritsch C.Fritzsch 傅成栋 高涵 高原宁 高扬 S.Garbolino I.Garzia 葛潘婷 葛振武 耿聪 E.M.Gersabeck A Gilman K.Goetzen 龚丽 龚文煊 W.Gradl M.Greco 谷立民 顾旻皓 顾运厅 关春懿 郭爱强 郭立波 郭如盼 郭玉萍 A.Guskov 韩文颖 郝喜庆 F.A.Harris 何凯凯 何康林 F.H.Heinsius C.H.Heinz 衡月昆 C.Herold 侯国一 侯颖锐 侯治龙 胡海明 j.F.Hu 胡涛 胡誉 黄光顺 黄凯旋 黄麟钦 黄性涛 黄燕萍 黄震 T.Hussain N Hüsken W.Imoehl M.Irshad j.jackson S.jaeger S.janchiv E.jang j. 《Chinese Physics C》 SCIE CAS CSCD 2023年第2期1-18,共18页
Using electron-positron annihilation data samples corresponding to an integrated luminosity of 4.5 fb-1,collected by the BESⅢdetector in the energy region between 4599.53 MeV and 4698.82 MeV,we report the first obser... Using electron-positron annihilation data samples corresponding to an integrated luminosity of 4.5 fb-1,collected by the BESⅢdetector in the energy region between 4599.53 MeV and 4698.82 MeV,we report the first observations of the Cabibbo-suppressed decaysΛ_(c)^(+)→nπ^(+)π^(0),Λ_(c)^(+)→nπ^(+)π^(-)π^(+),and the Cabibbo-favored decayΛ_(c)^(+)→nK^(-)π^(+)π^(+)with statistical significances of 7.9σ,7.8σ,and>10σ,respectively.The branching fractions of these decays are measured to be B(Λ_(c)^(+)→nπ^(+)π^(0))=(0.64±0.09±0.02)%,B(Λ_(c)^(+)→nπ^(+)π^(-)π^(+))=(0.45±0.07±0.03)%,and B(Λ_(c)^(+)→nK^(-)π^(+)π^(+))=(1.90±0.08±0.09)%,where the first uncertainties are statistical and the second are systematic.We find that the branching fraction of the decayΛ_(c)^(+)→nπ^(+)π^(0)is about one order of magnitude higher than that ofΛ_(c)^(+)→nπ^(+). 展开更多
关键词 ∧_(c)^(+)baryon Branching fraction BESⅢdetector
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Observation of e^(+)e^(-)→pppñπ-+c.c.
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作者 麦迪娜 M.N.Achasov +140 位作者 P.Adlarson M.Albrecht R.Aliberti A.Amoroso 安美儒 安琪 白旭红 白羽 O.Bakina R.Baldini Ferroli I.Balossino 班勇 V.Batozskaya D.Becker K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi j.Bloms A.Bortone I.Boyko R.A.Briere A.Brueggemann 蔡浩 蔡啸 A.Calcaterra 曹国富 曹宁 S.A.Cetin 常劲帆 常万玲 G.Chelkov 陈琛 陈超 陈刚 陈和生 陈玛丽 陈申见 陈少敏 T.Chen 陈旭荣 X.T.Chen 陈元柏 陈卓俊 成伟帅 初晓 G.Cibinetto F.Cossio 崔佳佳 代洪亮 代建平 A.Dbeyssi R.E.de Boer D.Dedovich 邓子艳 A.Denig I.Denysenko M.Destefanis F.De Mori 丁勇 董静 董燎原 董明义 董翔 杜书先 P.Egorov 范玉兰 方建 房双世 方文兴 方易 R.Farinelli L.Fava F.Feldbauer G.Felici 封常青 冯俊华 K Fischer M.Fritsch C.Fritzsch 傅成栋 高涵 高原宁 高扬 S.Garbolino I.Garzia 葛潘婷 葛振武 耿聪 E.M.Gersabeck A Gilman K.Goetzen 龚丽 龚文煊 W.Gradl M.Greco 谷立民 顾旻皓 顾运厅 关春懿 郭爱强 郭立波 郭如盼 郭玉萍 A.Guskov 韩婷婷 韩文颖 郝喜庆 F.A.Harris 何凯凯 何康林 F.H.Heinsius C.H.Heinz 衡月昆 C.Herold M.Himmelreich 侯国一 侯颖锐 侯治龙 胡海明 j.F.Hu 胡涛 胡誉 黄光顺 黄凯旋 黄麟钦 黄麟钦 黄性涛 黄燕萍 黄震 T.Hussain N Hüsken W.Imoehl M.Irshad j.jackson S.jaeger S.janchiv 纪全 姬清平 《Chinese Physics C》 SCIE CAS CSCD 2023年第4期16-25,共10页
Using data taken at 29 center-of-mass energies between 4.16 and 4.70 GeV with the BESⅢdetector at the Beijing Electron Positron Collider corresponding to a total integrated luminosity of approximately 18.8 fb^(-1),th... Using data taken at 29 center-of-mass energies between 4.16 and 4.70 GeV with the BESⅢdetector at the Beijing Electron Positron Collider corresponding to a total integrated luminosity of approximately 18.8 fb^(-1),the process e^(+)e^(-)→pppñπ+c.c.is observed for the first time with a statistical significance of 11.5σ.The average Born cross sections in the energy ranges of(4.160,4.380)GeV,(4.400,4.600)GeV and(4.610,4.700)GeV are measured to be(21.5±5.7±1.2)fb,(46.3±10.6±2.5)fb and(59.0±9.4±3.2)fb,respectively,where the first uncertainties are statistical and the second are systematic.The line shapes of the pñ and ppπ^(-)invariant mass spectra are consistent with phase space distributions,indicating that no hexaquark or di-baryon state is observed. 展开更多
关键词 Multi-baryon channel hexaquark di-baryon states cross section measurement
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Search for hidden-charm tetraquark with strangeness in e^(+)e^(−)→K^(+)D_(s)^(∗−) D^(∗0 )+ c.c.
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作者 麦迪娜 M.N.Achasov +138 位作者 P.Adlarson M.Albrecht R.Aliberti A.Amoroso 安美儒 安琪 白羽 O.Bakina R.Baldini Ferroli I.Balossino Y.Ban V.Batozskaya D.Becker K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi E.Bianco j.Bloms A.Bortone I.Boyko R.A.Briere A.Brueggemann 蔡浩 蔡啸 A.Calcaterra 曹国富 曹宁 S.A.Cetin 常劲帆 常万玲 车国荣 G.Chelkov 陈琛 陈超 陈刚 陈和生 陈玛丽 陈申见 陈少敏 T.Chen 陈旭荣 X.T.Chen 陈元柏 陈卓俊 成伟帅 S.K.Choi 初晓 G.Cibinetto F.Cossio 崔佳佳 代洪亮 代建平 A.Dbeyssi R.E.de Boer D.Dedovich 邓子艳 A.Denig I.Denysenko M.Destefanis F.De Mori 丁勇 丁逸 董静 董燎原 董明义 董翔 杜书先 段宗欢 P.Egorov 范玉兰 方建 房双世 方文兴 方易 R.Farinelli L.Fava F.Feldbauer G.Felici 封常青 冯俊华 K Fischer M.Fritsch C.Fritzsch 傅成栋 高涵 高原宁 高扬 S.Garbolino I.Garzia 葛潘婷 葛振武 耿聪 E.M.Gersabeck A Gilman K.Goetzen 龚丽 龚文煊 W.Gradl M.Greco 谷立民 顾旻皓 顾运厅 关春懿 郭爱强 郭立波 郭如盼 郭玉萍 A.Guskov 韩文颖 郝喜庆 F.A.Harris 何凯凯 何康林 F.H.Heinsius C.H.Heinz 衡月昆 C.Herold 侯国一 侯颖锐 侯治龙 胡海明 j.F.Hu 胡涛 胡誉 黄光顺 黄凯旋 黄麟钦 黄性涛 黄燕萍 黄震 T.Hussain N Hüsken W.Imoehl M.Irshad j.jackson S.jaeger S.janchiv 《Chinese Physics C》 SCIE CAS CSCD 2023年第3期1-14,共14页
We report a search for a heavier partner of the recently observed Z_(cs)(3985)^(-) state,denoted as Z_(cs)^('-),in the process e^(+)e^(−)→K^(+)D_(s)^(∗−) D^(∗0 )+ c.c.,based on e^(*)e^(-)collision data collected ... We report a search for a heavier partner of the recently observed Z_(cs)(3985)^(-) state,denoted as Z_(cs)^('-),in the process e^(+)e^(−)→K^(+)D_(s)^(∗−) D^(∗0 )+ c.c.,based on e^(*)e^(-)collision data collected at the center-of-mass energies of √s=4.661,4.682 and 4.699 GeV with the BESIII detector.The Z_(cs)^('-) is of interest as it is expected to be a candidate for a hidden-charm and open-strange tetraquark.A partial-reconstruction technique is used to isolate K^(+)recoil-mass spectra,which are probed for a potential contribution from Z_(cs)^('-)→D_(s)^(∗−) D^(∗0 )+ c.c.We find an excess of Z_(cs)^('-)→D_(s)^(*-)-D^(*0)(c.c.)candidates with a significance of 2.1o,after considering systematic uncertainties,at a mass of(4123.5±0.7_(sat)±4.7_(syst.))MeV/c^(2).As the data set is limited in size,the upper limits are evaluated at the 90%confidence level on the product of the Born cross sections(σ^(Borm))and the branching fraction(B)of Z_(cs)^('-)→D_(s)^(*-)-D^(*0),under different assumptions of the Z_(cs)^('-) mass from 4.120 to 4.140 MeV and of the width from 10 to 50 MeV at the three center-of-mass energies.The upper limits of σ^(Born).B are found to be at the level of O(1)pb at each energy.Larger data samples are needed to confirm the Z_(cs)^('-) state and clarify its nature in the coming years. 展开更多
关键词 electron-positron collision BESIl hadron spectroscopy TETRAQUARK
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Search for the weak decayψ(3686)→■+c.c.
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作者 麦迪娜 M.N.Achasov +152 位作者 P.Adlarson M.Albrecht R.Aliberti A.Amoroso 安美儒 安琪 白旭红 白羽 O.Bakina R.Baldini Ferroli I.Balossino 班勇 V.Batozskaya D.Becker K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi j.Bloms A.Bortone I.Boyko R.A.Briere A.Brueggemann 蔡浩 蔡啸 A.Calcaterra 曹国富 曹宁 S.A.Cetin 常劲帆 常万玲 G.Chelkov 陈琛 陈超 陈刚 陈和生 陈玛丽 陈申见 陈少敏 T.Chen 陈旭荣 X.T.Chen 陈元柏 陈卓俊 成伟帅 初晓 G.Cibinetto F.Cossio 崔佳佳 代洪亮 代建平 A.Dbeyssi R.E.de Boer D.Dedovich 邓子艳 A.Denig I.Denysenko M.Destefanis F.De Mori 丁勇 董静 董燎原 董明义 董翔 杜书先 P.Egorov 范玉兰 方建 房双世 方文兴 方易 R.Farinelli L.Fava F.Feldbauer G.Felici 封常青 冯俊华 K Fischer M.Fritsch C.Fritzsch 傅成栋 高涵 高原宁 高扬 S.Garbolino I.Garzia 葛潘婷 葛振武 耿聪 E.M.Gersabeck A Gilman K.Goetzen 龚丽 龚文煊 W.Gradl M.Greco 谷立民 顾旻皓 顾运厅 关春懿 郭爱强 郭立波 郭如盼 郭玉萍 A.Guskov 韩婷婷 韩文颖 郝喜庆 F.A.Harris 何凯凯 何康林 F.H.Heinsius C.H.Heinz 衡月昆 C.Herold M.Himmelreich 侯国一 侯颖锐 侯治龙 胡海明 j.F.Hu 胡涛 胡誉 黄光顺 黄凯旋 黄麟钦 黄麟钦 黄性涛 黄燕萍 黄震 T.Hussain N Hüsken W.Imoehl M.Irshad j.jackson S.jaeger S.janchiv 纪全 姬清平 季晓斌 季筱璐 吉钰瑶 贾泽坤 姜侯兵 姜赛赛 江晓山 Y.jiang 焦健斌 焦铮 金山 金毅 荆茂强 《Chinese Physics C》 SCIE CAS CSCD 2023年第1期19-27,共9页
Using(448.1±2.9)×10^(6)ψ(3686)for the weak baryonic decayψ(3686)→Λc+∑-+c.c..The analysis procedure is optimized using a blinded method.No significant signal is observed,and the upper limit on the branch... Using(448.1±2.9)×10^(6)ψ(3686)for the weak baryonic decayψ(3686)→Λc+∑-+c.c..The analysis procedure is optimized using a blinded method.No significant signal is observed,and the upper limit on the branching fraction(B)ofψ(3686)→Λc+∑-+c.c.is set as 1.4×10^(-5)at the 90%confidence level. 展开更多
关键词 weak decay upper limit BESIII detector
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Number of J/ψ events at BESIII
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作者 M.Ablikim M.N.Achasov +147 位作者 P.Adlarson S.Ahmed M.Albrecht R.Aliberti A.Amoroso M.R.An q.An X.H.Bai Y.Bai O.Bakina R.Baldini Ferroli I.Balossino Y.Ban K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi j.Bloms A.Bortone I.Boyko R.A.Briere H.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin j.F.Chang W.L.Chang G.Chelkov G.Chen H.S.Chen M.L.Chen S.j.Chen X.R.Chen Y.B.Chen Z.j.Chen W.S.Cheng G.Cibinetto F.Cossio j.j.Cui X.F.Cu H.L.Dai j.P.Dai X.C.Dai A.Dbeyssi R.E.de Boer D.Dedovich Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori Y.Ding C.Dong j.Dong L.Y.Dong M.Y.Dong X.Dong S.X.Du P.Egorov Y.L.Fan j.Fang S.S.Fang Y.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.q.Feng j.H.Feng M.Fritsch C.D.Fu Y.Gao Y.Gao I.Garzia P.T.Ge C.Geng E.M.Gersabeck A Gilman K.Goetzen L.Gong W.X.Gong W.Gradl M.Greco L.M.Gu M.H.Gu C..Y.Guan A.q.Guo A.q.Guo L.B.Guo R.P.Guo Y.P.Guo A.Guskov T.T.Han W.Y.Han X.q.Hao F.A.Harris K.K.He K.L.He F.H.Heinsius C.H.Heinz Y.K.Heng C.Herold M.Himmelreich T.Holtmann G.Y.Hou Y.R.Hou Z.L.Hou H.M.Hu j.F.Hu T.Hu Y.Hu G.S.Huang L.q.Huang X.T.Huang Y.P.Huang Z.Huang T.Hussain N Husken W.Ikegami Andersson W.Imoehl M.Irshad S.jaeger S.janchiv q.ji q.P.ji X.B.ji X.L.ji Y.Y.ji H.B.jiang X.S.jiang j.B.jiao Z.jiao S.jin Y.jin M.q.jing T.johansson N.Kalantar-Nayestanaki X.S.Kang R.Kappert M.Kavatsyuk B.C.Ke I.K.Keshk A.Khoukaz P.Kiese R.Kiuchi 《Chinese Physics C》 SCIE CAS CSCD 2022年第7期74-84,共11页
Using inclusive decays of J/ψ aprecise determination of the number of J/ψ events collected with the BESIII detector was performed.For the two data sets taken in 2009 and 2012,the numbers of J/ψ events were recalcul... Using inclusive decays of J/ψ aprecise determination of the number of J/ψ events collected with the BESIII detector was performed.For the two data sets taken in 2009 and 2012,the numbers of J/ψ events were recalculated to be(224.0±1.3)×10^(6) and(1088.5±4.4)×10^(6),respectively;these numbers are in good agreement with the previous measurements. For the J/ψ sample taken in 2017-2019,the number of events was determined to be(8774.0±39.4)×10^(6).The total number of J/ψ events collected with the BESIII detector was determined to be(10087±44)×10^(6),where the uncertainty is dominated by systematic effects,and the statistical uncertainty is negligible. 展开更多
关键词 number of J/ψevents BESIII detector inclusive J/ψdecays
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Measurement of integrated luminosities at BESⅢ for data samples at center-of-mass energies between 4.0 and 4.6 GeV
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作者 M.Ablikim M.N.Achasov +145 位作者 P.Adlarson S.Ahmed M.Albrecht R.Aliberti A.Amoroso M.R.An q.An X.H.Bai Y.Bai O.Bakina R.Baldini Ferroli I.Balossino Y.Ban V.Batozskaya D.Becker K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi j.Bloms A.Bortone I.Boyko R.A.Briere A.Brueggemann H.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin j.F.Chang W.L.Chang G.Chelkov C.Chen G.Chen H.S.Chen M.L.Chen S.j.Chen T.Chen X.R.Chen X.T.Chen Y.B.Chen Z.j.Chen W.S.Cheng X.Chu G.Cibinetto F.Cossio j.j.Cui H.L.Dai j.P.Dai A.Dbeyssi R.Ede Boer D.Dedovich Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori Y.Ding j.Dong L.Y.Dong M.Y.Dong X.Dong S.X.Du P.Egorov Y.L.Fan j.Fang S.S.Fang W.X.Fang Y.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.q.Feng j.H.Feng K Fischer M.Fritsch C.Fritzsch C.D.Fu H.Gao Y.N.Gao Yang Gao S.Garbolino I.Garzia P.T.Ge C.Geng E.M.Gersabeck A Gilman K.Goetzen L.Gong W.X.Gong W.Gradl M.Greco M.H.Gu C.Y Guan A.q.Guo L.B.Guo R.P.Guo Y.P.Guo A.Guskov T.T.Han W.Y.Han X.q.Hao F.A.Harris K.K.He K.L.He F.H.Heinsius C.H.Heinz Y.K.Heng C.Herold M.Himmelreich T.Holtmann G.Y.Hou Y.R.Hou Z.L.Hou H.M.Hu j.F.Hu T.Hu Y.Hu G.S.Huang K.X.Huang L.q.Huang L.q.Huang X.T.Huang Y.P.Huang Z.Huang T.Hussain N Husken W.Imoehl M.Irshad j.jackson S.jaeger S.janchiv q.ji q.P.ji X.B.ji X.L.ji Y.Y.ji Z.K.jia H.B.jiang S.S.jiang X.S.jiang Y.jiang j.B.jiao 《Chinese Physics C》 SCIE CAS CSCD 2022年第11期53-63,共11页
The integrated luminosities of data samples collected in the BESⅢ experiment in 2016-2017 at centerof-mass energies between 4.19 and 4.28 GeV are measured with a precision better than 1% by analyzing large-angle Bhab... The integrated luminosities of data samples collected in the BESⅢ experiment in 2016-2017 at centerof-mass energies between 4.19 and 4.28 GeV are measured with a precision better than 1% by analyzing large-angle Bhabha scattering events.The integrated luminosities of old datasets collected in 2010-2014 are updated by considering corrections related to detector performance,offsetting the effect of newly discovered readout errors in the electromagnetic calorimeter,which can haphazardly occur. 展开更多
关键词 integrated luminosity e^(+)e^(-)annihilation Bhabha scattering
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Luminosities and energies of e^(+)e^(−) collision data taken between √s=4.61 GeV and 4.95 GeV at BESⅢ
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作者 M.Ablikim M.N.Achasov +145 位作者 P.Adlarson M.Albrecht R.Aliberti A.Amoroso M.R.An q.An X.H.Bai Y.Bai O.Bakina R.Baldini Ferroli I.Balossino Y.Ban V.Batozskaya D.Becker K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi j.Bloms A.Bortone I.Boyko R.A.Briere A.Brueggemann H.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin j.F.Chang W.L.Chang G.Chelkov C.Chen G.Chen H.S.Chen M.L.Chen S.j.Chen T.Chen X.R.Chen X.T.Chen Y.B.Chen Z.j.Chen W.S.Cheng X.Chu G.Cibinetto F.Cossio j.j.Cui H.L.Dai j.P.Dai A.Dbeyssi R.Ede Boer D.Dedovich Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori Y.Ding j.Dong L.Y.Dong M.Y.Dong X.Dong S.X.Du P.Egorov Y.L.Fan j.Fang S.S.Fang W.X.Fang Y.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.q.Feng j.H.Feng K Fischer M.Fritsch C.Fritzsch C.D.Fu H.Gao Y.N.Gao Yang Gao S.Garbolino I.Garzia P.T.Ge C.Geng E.M.Gersabeck A Gilman K.Goetzen L.Gong W.X.Gong W.Gradl M.Greco M.H.Gu C.Y Guan A.q.Guo L.B.Guo R.P.Guo Y.P.Guo A.Guskov T.T.Han W.Y.Han X.q.Hao F.A.Harris K.K.He K.L.He F.H.Heinsius C.H.Heinz Y.K.Heng C.Herold M.Himmelreich T.Holtmann G.Y.Hou Y.R.Hou Z.L.Hou H.M.Hu j.F.Hu T.Hu Y.Hu G.S.Huang K.X.Huang L.q.Huang L.q.Huang X.T.Huang Y.P.Huang Z.Huang T.Hussain N Husken W.Imoehl M.Irshad j.jackson S.jaeger S.janchiv q.ji q.P.ji X.B.ji X.L.ji Y.Y.ji Z.K.jia H.B.jiang S.S.jiang X.S.jiang Y.jiang j.B.jiao Z.jiao 《Chinese Physics C》 SCIE CAS CSCD 2022年第11期64-75,共12页
From December 2019 to June 2021,the BESⅢ experiment collected approximately 5.85 fb^(−1) of data at center-of-mass energies between 4.61 and 4.95 GeV.This is the highest collision energy BEPCⅡ has reached to date.Th... From December 2019 to June 2021,the BESⅢ experiment collected approximately 5.85 fb^(−1) of data at center-of-mass energies between 4.61 and 4.95 GeV.This is the highest collision energy BEPCⅡ has reached to date.The accumulated e^(+)e^(−) annihilation data samples are useful for studying charmonium(-like)states and charmed-hadron decays.By adopting a novel method of analyzing the production of A_(c)^(+)A_(c)^(-) pairs in e^(+)e^(−) annihilation,the center-of-mass energies are measured with a precision of 0.6 MeV.Integrated luminosities are measured with a precision of better than 1% by analyzing the events of large-angle Bhabha scattering.These measurements provide important inputs to analyses based on these data samples. 展开更多
关键词 LUMINOSITY center-of-mass energy BESⅢdetector
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Observation of the Y(4230)and a new structure in e^(+)e^(-)→K^(+)K^(-)J/Ψ
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作者 M.Ablikim M.N.Achasov +145 位作者 P.Adlarson M.Albrecht R.Aliberti A.Amoroso M.R.An q.An X.H.Bai Y.Bai O.Bakina R.Baldini Ferroli I.Balossino Y.Ban V.Batozskaya D.Becker K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi j.Bloms A.Bortone I.Boyko R.A.Briere A.Brueggemann H.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin j.F.Chang W.L.Chang G.Chelkov C.Chen G.Chen H.S.Chen M.L.Chen S.j.Chen T.Chen X.R.Chen X.T.Chen Y.B.Chen Z.j.Chen W.S.Cheng X.Chu G.Cibinetto F.Cossio j.j.Cui H.L.Dai j.P.Dai A.Dbeyssi R.Ede Boer D.Dedovich Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori Y.Ding j.Dong L.Y.Dong M.Y.Dong X.Dong S.X.Du P.Egorov Y.L.Fan j.Fang S.S.Fang W.X.Fang Y.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.q.Feng j.H.Feng K Fischer M.Fritsch C.Fritzsch C.D.Fu H.Gao Y.N.Gao Yang Gao S.Garbolino I.Garzia P.T.Ge C.Geng E.M.Gersabeck A Gilman K.Goetzen L.Gong W.X.Gong W.Gradl M.Greco M.H.Gu C.Y Guan A.q.Guo L.B.Guo R.P.Guo Y.P.Guo A.Guskov T.T.Han W.Y.Han X.q.Hao F.A.Harris K.K.He K.L.He F.H.Heinsius C.H.Heinz Y.K.Heng C.Herold M.Himmelreich T.Holtmann G.Y.Hou Y.R.Hou Z.L.Hou H.M.Hu j.F.Hu T.Hu Y.Hu G.S.Huang K.X.Huang L.q.Huang L.q.Huang X.T.Huang Y.P.Huang Z.Huang T.Hussain N Husken W.Imoehl M.Irshad j.jackson S.jaeger S.janchiv q.ji q.P.ji X.B.ji X.L.ji Y.Y.ji Z.K.jia H.B.jiang S.S.jiang X.S.jiang Y.jiang j.B.jiao Z.jiao 《Chinese Physics C》 SCIE CAS CSCD 2022年第11期7-21,共15页
The cross sections of e^(+)e^(-)→K^(+)K^(-)J/Ψat center-of-mass energies from 4.127 to 4.600 GeV are measured based on 15.6 fb-1data collected with the BESⅢ detector operating at the BEPCⅡ storage ring.Two resonan... The cross sections of e^(+)e^(-)→K^(+)K^(-)J/Ψat center-of-mass energies from 4.127 to 4.600 GeV are measured based on 15.6 fb-1data collected with the BESⅢ detector operating at the BEPCⅡ storage ring.Two resonant structures are observed in the line shape of the cross sections.The mass and width of the first structure are measured to be(4225.3±2.3±21.5)MeV and(72.9±6.1±30.8)MeV,respectively.They are consistent with those of the established Y(4230).The second structure is observed for the first time with a statistical significance greater than 8σ,denoted as Y(4500).Its mass and width are determined to be(4484.7±13.3±24.1)MeV and(111.1±30.1±15.2)MeV,respectively.The first presented uncertainties are statistical and the second ones are systematic.The product of the electronic partial width with the decay branching fractionΓ(Y(4230)→e^(+)e^(−))B(Y(4230)→K^(+)K^(−)J/Ψ)is reported. 展开更多
关键词 Y states charmonium-like states BESⅢ
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Measurements of the center-of-mass energies of e^(+)e^(-)collisions at BESIII
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作者 M.Ablikim M.N.Achasov +146 位作者 P.Adlarson S.Ahmed M.Albrecht R.Aliberti A.Amoroso M.R.An q.An X.H.Bai Y.Bai O.Bakina R.Baldini Ferroli I.Balossino Y.Ban K.Begzsuren N.Berger M.Bertani D.Bettoni F.Bianchi j.Bloms A.Bortone I.Boyko R.A.Briere H.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin j.F.Chang W.L.Chang G.Chelkov D.Y.Chen G.Chen H.S.Chen M.L.Chen S.j.Chen X.R.Chen Y.B.Chen Z.j.Chen W.S.Cheng G.Cibinetto F.Cossio X.F.Cui H.L.Dai X.C.Dai A.Dbeyssi R.E.de Boer D.Dedovich Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori Y.Ding C.Dong j.Dong L.Y.Dong M.Y.Dong X.Dong S.X.Du Y.L.Fan j.Fang S.S.Fang Y.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.q.Feng j.H.Feng M.Fritsch C.D.Fu Y.Gao Y.Gao Y.Gao Y.G.Gao I.Garzia P.T.Ge C.Geng E.M.Gersabeck A Gilman K.Goetzen L.Gong W.X.Gong W.Gradl M.Greco L.M.Gu M.H.Gu Y.T.Gu C.Y Guan A.q.Guo L.B.Guo R.P.Guo Y.P.Guo A.Guskov T.T.Han W.Y.Han X.q.Hao F.A.Harris K.L.He F.H.Heinsius C.H.Heinz T.Held Y.K.Heng C.Herold M.Himmelreich T.Holtmann G.Y.Hou Y.R.Hou Z.L.Hou H.M.Hu j.F.Hu T.Hu Y.Hu G.S.Huang L.q.Huang X.T.Huang Y.P.Huang Z.Huang T.Hussain N Husken W.Ikegami Andersson W.Imoehl M.Irshad S.jaeger S.janchiv q.ji q.P.ji X.B.ji X.L.ji Y.Y.ji H.B.jiang X.S.jiang j.B.jiao Z.jiao S.jin Y.jin M.q.jing T.johansson N.Kalantar-Nayestanaki X.S.Kang R.Kappert M.Kavatsyuk B.C.Ke I.K.Keshk A.Khoukaz P.K 《Chinese Physics C》 SCIE CAS CSCD 2021年第10期7-15,共9页
During the 2016-17 and 2018-19 running periods,the BESIII experiment collected 7.5 fb of e^(+)e^(-)collision data at center-of-mass energies ranging from 4.13 to 4.44 GeV.These data samples are primarily used for the ... During the 2016-17 and 2018-19 running periods,the BESIII experiment collected 7.5 fb of e^(+)e^(-)collision data at center-of-mass energies ranging from 4.13 to 4.44 GeV.These data samples are primarily used for the study of excited charmonium and charmoniumlike states.By analyzing the di-muon process e^(+)e^(-)→(γISR=FSR)μ^(+)μ^(-),we measure the center-of-mass energies of the data samples with a precision of 0.6 MeV.Through a run-by-run study,we find that the center-of-mass energies were stable throughout most of the data-collection period. 展开更多
关键词 center-of-mass ENERGY e^(+)e^(-) ANNIHILATION BESIII
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Microstructural features of Ti-6Al-4V manufactured via high power laser directed energy deposition under low-cycle fatigue 被引量:3
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作者 Y.M.Ren X.lin +5 位作者 H.O.Yang H.Tan j.Chen Z.Y.jian j.q.li W.D.Huang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第24期18-33,共16页
Laser additive manufacturing(LAM)technique has unique advantages in producing geometrically complex metallic components.However,the poor low-cycle fatigue property(LCF)of LAM parts restricts its widely used.Here,the m... Laser additive manufacturing(LAM)technique has unique advantages in producing geometrically complex metallic components.However,the poor low-cycle fatigue property(LCF)of LAM parts restricts its widely used.Here,the microstructural features of a Ti-6 Al-4 V alloy manufactured via high power laser directed energy deposition subjected to low-cycle fatigue loading were studied.Before fatigue loading,the microstructure of the as-deposited parts was found to exhibit a non-homogeneous distribution of columnar prior-βgrains(200-4000μm)at various scanning velocities(300-1500 mm/min)and relatively coarseα-laths(1.0-4.5μm).Under cyclic loading,fatigue microcracks typically initiated within the alignedαphases in the preferred orientation(45°to the loading direction)at the surface of the fatigue specimens.Fatigued Ti-6 Al-4 V exhibited a single straight dislocation character at low strain amplitudes(<0.65%)and dislocation dipoles or even tangled dislocations at high strain amplitudes(>1.1%).In addition,dislocation substructure features,such as dislocation walls,stacking faults,and dislocation networks,were also observed.These findings may provide opportunities to understand the fatigue failure mechanism of additive manufactured titanium parts. 展开更多
关键词 Laser additive manufacturing Directed energy deposition Titanium alloy Low-cycle fatigue MICROSTRUCTURE
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Wetting Behaviours of a Single Droplet on Biomimetic Micro Structured Surfaces 被引量:9
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作者 Y.q.Zu~1,Y.Y.Yan~1,j.q.li~2,Z.W.Han~2 1.Faculty of Engineering,University of Nottingham,Nottingham NG7 2RD,UK 2.Key Laboratory of Bionic Engineering (Ministry of Education,China),jilin University,Changchun 130022,P.R.China 《Journal of Bionic Engineering》 SCIE EI CSCD 2010年第2期191-198,共8页
Natural surfaces with super hydrophobic properties often have micro or hierarchical structures.In this paper, the wettingbehaviours of a single droplet on biomimetic micro structured surfaces with different roughness ... Natural surfaces with super hydrophobic properties often have micro or hierarchical structures.In this paper, the wettingbehaviours of a single droplet on biomimetic micro structured surfaces with different roughness parameters are investigated.Atheoretical model is proposed to study wetting transitions.The results of theoretical analysis are compared with those of experimentindicating that the proposed model can effectively predict the wetting transition.Furthermore, a numerical simulationbased on the meso scale Lattice Boltzmann Method (LBM) is performed to study dynamic contact angles, contact lines, andlocal velocity fields for the case that a droplet displays on the micro structured surface.A spherical water droplet with r= 15 μmfalls down to a biomimetic square-post patterned surface under the force of gravity with an initial velocity of 0.01 m·sand aninitial vertical distance of 20 μm from droplet centre to the top of pots.In spite of a higher initial velocity, the droplet can stillstay in a Cassie state; moreover, it reaches an equilibrium state at t≈17.5 ms, when contact angle is 153.16° which is slightlylower than the prediction of Cassie-Baxter’s equation which gives θ=154.40°. 展开更多
关键词 BIOMIMETIC wetting behaviours roughness surfaces contact angle wetting transition
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Effects of the Reversely Rotating Assisted Shoulder on Microstructures During the Reverse Dual-rotation Friction Stir Welding 被引量:3
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作者 j.q.li H.j.liu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2015年第4期375-383,共9页
The reverse dual-rotation friction stir welding(RDR-FSW) has the capability to adjust the heat generation because of the separately designed tool shoulder and tool pin.The welding torque exerted on the workpiece by th... The reverse dual-rotation friction stir welding(RDR-FSW) has the capability to adjust the heat generation because of the separately designed tool shoulder and tool pin.The welding torque exerted on the workpiece by the reversely rotating shoulder is opposite to that exerted by the rotating tool pin,so the total welding torque is reduced,which is beneficial to reducing the clamping requirement of workpieces.In the present paper,a RDR-FSW joint was welded in a condition similar to the optimal welding condition of conventional FSW,and microstructures in various zones were investigated by comparison,aiming to highlight effects of the reversely rotating assisted shoulder.Due to the heat conduction of the middle cylinder and the bottom end cover on which the assisted shoulder was machined,the thermal effect of RDR-FSW was smaller than that of the conventional FSW.Moreover,the effect of assisted shoulder on the plastic flow or deformation of material or was constrained in a thin layer near the weld top surface,and thus the flow of material especially along the thickness direction was clearly decreased in the RDR-FSW.In the heat-affected zone(HAZ),the precipitate coarsening was the main evolution and was completed through the dissolution of small precipitates and the continuous growth of large precipitates.By contrast,the dissolution degree of precipitates increased significantly in the thermomechanically affected zone(TMAZ),and a small amount of original meta-stable precipitates transformed to block-shaped stable precipitates.Precipitate evolutions in the shoulder affected zone(SAZ)and the weld nugget zone were similar,i.e.the majority of original meta-stable precipitates dissolved into the matrix and the remainder transformed to stable precipitates,though the dissolution degree was greater in the SAZ.Compared with the conventional FSW joint,the coarsening degrees of precipitates in the HAZ and TMAZ of RDR-FSW joint were much smaller,as well as the dissolution degrees of precipitates in all four specified zones. 展开更多
关键词 Friction stir welding Reverse dual-rotation fricti
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