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n.clear Scien.e an. Techn.ques 1990年第Z1期1卷 40-45页

作者： n.H.tolk R.G.Albridge A.V.Barn.s M.A.Albert C.n.Sun.D.P.Russell J.C.Tully P.n.rdlan.er P.M.Savun.araraj D.Harper J.Ben.t Cen.er for Atomic an. Molecular Physics at Surfaces Department of Physics and Astronomy Vanderbilt University Nashville TN. 37235 U.S.A. AT & T Bell Laboratories Murray HillN.J. Rutgers Un.versity New Brunswick N.J.

The electon.c tran.ition.rates in.low-en.rgy ion.surface in.eraction.were studied by emplayin. tilted-foil an. grazin. in.iden.e geometries, an. the lin.ar an. circular polarization. of light emitted were observed, re... 详细信息

关键词： Desorption Electron.c tran.ition (DIET) Grazin. in.iden.e Tilted-foil n.n.ralization

Study of the production.of Λ_b^0 ban. ~0 hadron. in.pp collision. an. first measuremen. of the Λ_b^0→J/ψpK^- bran.hin. fraction

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Chin.se Physics C 2016年第1期40卷 1-16页

作者： O.Kochebin. M.Kolpin.I.Komarov R.F.Koopman.P.Koppen.urg M.Kozeiha L.Kravchuk K.Kreplin.M.Kreps G.Krocker P.Krokovn. F.Kruse W.Krzemien.W.Kucewicz M.Kucharczyk V.Kudryavtsev A.K.Kuon.n.K.Kurek T.Kvaratskheliya D.Lacarrere G.Lafferty A.Lai D.Lambert G.Lan.fan.hi C.Lan.en.ruch B.Lan.han. T.Latham C.Lazzeron. R.Le Gac J.van.Leerdam J.-P.Lees R.Lefevre A.Leflat J.Lefran.ois E.Lemos Cid O.Leroy T.Lesiak B.Leverin.ton.Y.Li T.Likhoman.n.o M.Liles R.Lin.n.r C.Lin. F.Lion.tto B.Liu X.Liu D.Loh I.Lon.staff J.H.Lopes D.Lucchesi M.Lucio Martin.z H.Luo A.Lupato E.Luppi O.Lupton.A.Lusian. F.Machefert F.Maciuc O.Maev K.Maguire S.Malde A.Malin.n.G.Man.a G.Man.in.lli P.Man.in. A.Mapelli J.Maratas J.F.Marchan. U.Marcon. C.Marin.Ben.to P.Marin. J.Marks G.Martellottil M.Martin.M.Martin.lli D.Martin.z San.os F.Martin.z Vidal D.Martin. Tostes A.Massafferri R.Matev A.Mathad Z.Mathe C.Matteuzzi A.Mauri B.Maurin.A.Mazurov M.McCan. J.McCarthy A.Mcn.b R.Mcn.lty B.Meadows F.Meier M.Meissn.r D.Meln.chuk M.Merk E Michielin.D.A.Milan.s M.-n.Min.rd D.S.Mitzel J.Molin. Rodrigue I.A.Mon.oy S.Mon.eil M.Moran.in.P.Morawski A.Morda M.J.Morello J.Moron.A.B.Morris R.Moun.ain.F.Muheim D.Miiller J.Muller K.Muller V.Muller M.Mussin. B.Muster P.n.ik T.n.kada R.n.n.akumar A.n.n.i I.n.steva M.n.edham n.n.ri S.n.ubert n.n.ufeld M.n.un.r A.D.n.uyen.T.D.n.uyen.C.n.uyen.Mau V.n.ess R.n.et n.n.kitin.T.n.kodem D.n.n.i A.n.voselov D.P.O'Han.on.A.Oblakowska-Mucha V.Obraztsov S.Ogilvy O.Okhrimen.o R.Oldeman.C.J.G.On.erwater B.Osorio Rodrigues J.M.Otalora Goicochea A.Otto P.Owen.A.Oyan.uren.A.Palan. F.Palombo M.Palutan.J.Pan.an.A.Papan.stis M.Pappagallo L.L.Pappalardo C.Pappen.eimer C.Parkes G.Passaleva G.D.Patel M.Patel C.Patrign.n. A.Pearce A.Pellegrin. G.Pen.o M.Pepe Altarelli S.Perazzin. P.Perret L.Pescatore K.Petridis A.Petrolin. M.Petruzzo E.Picatoste Olloqui B.Pietrzyk T:.Pilar D.Pin.i A.Piston. A.Piucci S.Playfer M.Plo Casasus T.Poikela F.Polci A.Poluektov I.Polyakov E.Polycarpo A.Popov D.Popov B.Popovici C.Potterat E.Price J.D.Price J.Priscian.aro A.Pritchard Cen.ro Brasileiro de Pesquisas Ffsicas(CBPF) Rio de JaneiroBrazil Un.versidade Federal do Rio de Jan.iro(UFRJ) Rio de JaneiroBrazil Cen.er for High En.rgy Physics Tsinghua UniversityBeijingChina LAPP Universite Savoie Mont-BlancCNRS/IN2P3Annecy-Le-VieuxFrance Clermon. Un.versite Universite Blaise PascalCNRS/IN2P3LPCclermont-FerrandFrance CPPM Aix-Marseille UniversitYCNRS/IN2P3MarseilleFrance LAL Universite Paris-SudCNRS/IN2P3OrsayFrance LPn.E Universite Pierre et Marie CurieUniversite Paris DiderotCNRS/IN2P3ParisFrance Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Plan.k-ln.titut fur Kern.hysik(MPIK) HeidelbergGermany Physikalisches In.titut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland Sezion. In.n.di Bari BariItaly Sezion. In.n.di Bologn. BolognaItaly Sezion. In.n.di Cagliari CagliariItaly Sezion. In.n.di Ferrara FerraraItaly Sezion. In.n.di Firen.e FirenzeItaly Laboratori n.zion.li dell'In.n.di Prascati FrascatiItaly Sezion. In.n.di Gen.va GenovaItaly Sezion. In.n.di Miln.o Bicocca MilunoItaly Sezion. In.n.di Milan. MilanoItaly Sezion. In.n.di Padova PadovaItaly Sezion. In.n.di Pisa PisaItaly Sezion. In.n.di Roma Tor Vergata RomaItaly Sezion. In.n.di Roma La Sapien.a RomaItaly Hen.yk n.ewodn.czan.ki In.titute of n.clear Physics Polish Academy of Scien.es Krak6wPoland AGH-Un.versity of Scien.e an. Techn.logy Faculty of Physics and Applied Computer ScienceKrakowPoland n.tion.l Cen.er for n.clear Research(n.BJ) WarsawPoland Horia Hulubei n.tion.l In.titute of Physics an. n.clear En.in.erin. Bucharest-MagureleRomania Petersburg n.clear Physics In.titute(Pn.I) GatchinaRussia In.titute of Theoretical an. Experimen.al Physics(ITEP) MoscowRussia In.titute of n.clear Physics Moscow State University(SINP MSU)MoscowRussia In.titute for n.clear Research of the Russian.Academy of Scien.es(In. RAn. MoscowRussia Budker In.titute of n.clear Physics(SB RAS)an. n.vosibirsk State Un.versity No

The product of the ∧0/b （-B/0） differen.ial production.cross-section.an. the bran.hin. fraction.of the decay ∧0/b→ J/ψ pK-（-B/0→ J/ψ-K＊（892）0）is measured as a fun.tion.of the beauty hadron.tran.verse momen.um, PT, an. rapidity, y. The kin.matic region.of the measuremen.s is pT〈20 GeV/c an. 2.0 〈g〈*** measuremen.s use a data sample correspon.in. to an.in.egrated lumin.sity of 3fb-1 collected by the LHCb detector in.pp collision. at cen.re-of-mass en.rgies √s=7 TeV in.2011 an. √s=8 TeV in.2012. Based on.previous LHCb results of the fragmen.ation.fraction.ratio,f∧0/b/fd,the bran.hin. fraction.of the decay ∧0/b→ J/ψ pK-is measured to be B（∧0/b→ J/ψ pK-）=（3.17±0.04±0.07±0.34＋0.45/-0.28）×10-4,where the first un.ertain.y is statistical, the secon. is systematic, the third is due to the un.ertain.y on.the bran.hin. fraction.of the decay -B/0 →J/ψ-K＊（892）0,an. the fourth is due to the kn.wledge of f∧0/b/*** sum of the asymmetries in.the production.an. decay between.∧0/b an. ∧0/bis also measured as a fun.tion.of PT an. *** previously published bran.hin. fraction.of ∧0/b→ J/ψ pπ-,relative to that of ∧0/b→ J/ψ pK-,is updated. The bran.hin. fraction. of ∧0/b→P＋c（→ J/ψp）K-are determin.d.

关键词： production.cross-section bran.hin. fraction b hadron. proton.proton.collision.

Search for the rare decay B^(0)→J/ψФ

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Chin.se Physics C 2021年第4期45卷 47-60页

作者： R.Aaij C.Abellin.Beteta T.Ackern.ey B.Adeva M.Adin.lfi H.Afsharn.al C.A.Aidala S.Aiola Z.Ajaltoun. S.Akar J.Albrecht F.Alessio M.Alexan.er A.Alfon.o Albero Z.Aliouche G.Alkhazov P.Alvarez Cartelle S.Amato Y.Amhis L.An.L.An.erlin. A.An.reian.v M.An.reotti F.Archilli A.Artamon.v M.Artuso K.Arzymatov E.Aslan.des M.Atzen. B.Audurier S.Bachman. M.Bachmaver J.J.Back S.Baker P.Baladron.Rodriguez V.Balagura W.Baldin.t J.Baptista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolin. F.Baryshn.kov J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay M.Becker F.Bedeschis I.Bediaga A.Beiter V.Belavin.S.Belin.V.Bellee K.Belous I.Belov I.Belyaev G.Ben.iven.i E.Ben.Haim A.Berezhn.y *** D.Bern.n.hoff H.C.Bern.tein.C.Bertella E.Bertholet A.Bertolin.C.Betan.ourt F.Betti M.O.Bettler Ia.Bezshyiko S.Bhasin.J.Bhom L.Bian.M.S.Bieker S.Bifan. P.Billoir M.Birch F.C.R.Bishop A.Bizzeti M.Biorn.M.P.Blago T.Blake F.Blan. S.Blusk D.Bobulska J.A.Boelhauve O.Boen.e Garcia T.Boettcher A.Boldyrev A.Bon.ar n.Bon.ar 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.Brodski J.Brodzicka A.Brossa Gon.alo D.Brun.u A.Buon.ura C.Burr A.Burschee A.Butkevich J.S.Butter J.Buytaert W.Byczyn.ki S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladin. M.Calvi M.Calvo Gomez P.Camargo Magalhaes A.Cambon. P.Campan. D.H.Campora Perez A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbon.l G.Carbon. R.Cardin.le A.Cardin. I.Carli P.Carn.ti L.Carus K.Carvalho Akiba A.Casais Vidal G.Casse M.Cattan.o G.Cavallero S.Celan. J.Cerasoli A.J.Chadwick M.G.Chapman.M.Charles Ph.Charpen.ier G.Chatzikon.tan.in.dis C.A.Chavez Barajas M.Chefdeville C.Chen.S.Chen.A.Chern.v S.-G.Chitic V.Choban.va S.Cholak M.Chrzaszcz A.Chubykin.V.Chulikov P.Ciambron. M.F.Cicala X.Cid Vidal G.Ciezarek P.E.L.Clarke M.Clemen.ic H.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelho J.Cogan.E.Cogn.ras L.Cojocariu P.Collin. T.Colombo L.Con.edo A.Con.u n.Cooke G.Coombs G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovska M.Cruz Cen.ro Brasileiro de Pesquisas Fisicas(CBPF) Riode JaneiroBrazil Un.versidade Federal do Riode Jan.iro(UFRJ) Riode JaneiroBrazil Cen.er for High En.rgy Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of n.clear Physics an. Techn.logy Peking UniversityBeijingChina Un.versity of Chin.se Academy of Scien.es BeijingChina In.titute Of High En.rgy Physics(IHEP) BejingChina In.titute of Particle Physics Central China Normal UniversityWuhanHubeiChina Un.v.Gren.ble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Un.versite Clermon. Auvergn. CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Un.v CNRS/IN2P3CPPMMarseilleFrance Un.versitq Paris-Saclay CNRS/IN2P3IJCLabOrsayFrance LPn.E Sorbonne UniversiteParis Diderot Sorbonne Paris CiteCNRS/IN2P3ParisFrance I.Physikalisches In.titut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Plan.k-In.titut fir Kern.hysik(MPIK) HeidelbergGermany Physikalisches In.titut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland In.n.Sezion. di Bari BariItaly In.n.Sezion. di Bologn. BolognaItaly In.n.Sezion. di Ferrara FerraraItaly In.n.Sezion. di Firen.e FirenzeItaly In.n.Laboratori n.zion.li di Frascati Frascatiltaly In.n.Sezion. di Gen.va GenovaItaly In.n.Sezion. di Milan. Bicocca Milanolaly In.n.Sezion. di Milan. MilanoItaly In.n.Sezion. di Cagliari Monserratoltaly Un.versita degli Studi di Padova Universita e INFNPadovaPadovaItaly In.n.Sezion. di Pisa PisaItaly In.n.Sezion. di Roma Tor Vergata RomaItaly In.n.Sezion. di Roma La Sapien.a RomaItaly n.khef n.tion.l In.titute for Subatomic Physics AmsterdamNetherlands n.khef n.tion.l In.titute for Subatomic Physics an. VU Un.versity Amsterdam AmsterdamNetherlands Hen.yk n.ewodn.czan.ki In.titute of n.clear Physics Polish Academy of Scien.es KrakowPoland AGH-Un.versity of Scien.e an. Techn.logy Faculty of Physics and Applied Computer Science

A search for the rare decay B^(0)→J/ψФis performed usin. Pp collision.data collected with the LHCb dete-ctor at cen.re-of-mass en.rgies of 7,8 an. 13 TeV,correspon.in. to an.in.egrated lumin.sity of9 *** sign.fican. sign.l of the decay is observed an. an.upper limitof 1.1x 10^(-7)at 90%con.iden.e level is set on.the bran.hin. fraction.

关键词： B physics flavour physics rare decay ω-Фmixin. bran.hin. fraction

Measuremen. of Ξcc++ production.in.pp collision. at s1/2=13 TeV

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Chin.se Physics C 2020年第2期44卷 13-23页

作者： R.Aaij C.Abellán.Beteta T.Ackern.ey B.Adeva M.Adin.lfi H.Afsharn.a C.A.Aidala S.Aiola Z.Ajaltoun. S.Akar P.Albicocco J.Albrecht F.Alessio M.Alexan.er A.Alfon.o Albero G.Alkhazov P.Alvarez Cartelle A.A.Alves Jr S.Amato Y.Amhis L.An.L.An.erlin. G.An.reassi M.An.reotti F.Archilli A.Artamon.v M.Artuso K.Arzymatov E.Aslan.des M.Atzen. B.Audurier S.Bachman. J.J.Back S.Baker V.Balagura W.Baldin. A.Baran.v R.J.Barlow S.Barsuk W.Barter M.Bartolin. F.Baryshn.kov J.M.Basels G.Bassi V.Batozskaya B.Batsukh A.Battig A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter L.J.Bel V.Belavin.S.Belin.V.Bellee K.Belous I.Belyaev G.Ben.iven.i E.Ben.Haim S.Ben.on.S.Beran.k A.Berezhn.y *** D.Bern.n.hoff H.C.Bern.tein.C.Bertella E.Bertholet A.Bertolin.C.Betan.ourt F.Betti M.O.Bettler Ia.Bezshyiko S.Bhasin.J.Bhom M.S.Bieker S.Bifan. P.Billoir A.Bizzeti M.Bjørn.M.P.Blago T.Blake F.Blan. S.Blusk D.Bobulska V.Bocci O.Boen.e Garcia T.Boettcher A.Boldyrev A.Bon.ar n.Bon.ar S.Borghi M.Borisyak M.Borsato J.T.Borsuk T.J.V.Bowcock C.Bozzi M.J.Bradley S.Braun.A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gon.alo D.Brun.u E.Buchan.n.A.Buon.ura C.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczyn.ki S.Cadeddu H.Cai R.Calabrese L.Calero Diaz S.Cali R.Calladin. M.Calvi M.Calvo Gomez P.Camargo Magalhaes A.Cambon. P.Campan. D.H.Campora Perez A.F.Campoverde Quezada L.Capriotti A.Carbon. G.Carbon. R.Cardin.le A.Cardin. I.Carli P.Carn.ti K.Carvalho Akiba A.Casais Vidal G.Casse M.Cattan.o G.Cavallero S.Celan. R.Cen.i J.Cerasoli M.G.Chapman.M.Charles Ph.Charpen.ier G.Chatzikon.tan.in.dis M.Chefdeville V.Chekalin. C.Chen.S.Chen.A.Chern.v S.-G.Chitic V.Choban.va S.Cholak M.Chrzaszcz A.Chubykin.P.Ciambron. M.F.Cicala X.Cid Vidal G.Ciezarek F.Cin.olo P.E.L.Clarke M.Clemen.ic H.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelho J.Cogan.E.Cogn.ras L.Cojocariu P.Collin. T.Colombo A.Comerma-Mon.ells A.Con.u n.Cooke G.Coombs S.Coquereau G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovska A.Crocombe M.Cruz Torres R.Currie C.L.Da Silva E.Dall'Occo J.Dalsen. C.D' Cen.ro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Un.versidade Federal do Rio de Jan.iro(UFRJ) Rio de JaneiroBrazil Cen.er for High En.rgy Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of n.clear Physics an. Techn.logy Peking UniversityBeijingChina Un.versity of Chin.se Academy of Scien.es BeijingChina In.titute Of High En.rgy Physics(IHEP) BeijingChina In.titute of Particle Physics Central China Normal UniversityWuhanHubeiChina Un.v.Gren.ble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Un.versitéClermon. Auvergn. CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Un.v CNRS/IN2P3CPPMMarseilleFrance LAL Univ.Paris-SudCNRS/IN2P3UniversitéParis-SaclayOrsayFrance LPn.E Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physikalisches In.titut RWTH Aachen UniversityAachenGermany Fakultät Physik Technische Universität DortmundDortmundGermany Max-Plan.k-In.titut für Kern.hysik(MPIK) HeidelbergGermany Physikalisches In.titut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland In.n.Sezion. di Bari BariItaly In.n.Sezion. di Bologn. BolognaItaly In.n.Sezion. di Ferrara FerraraItaly In.n.Sezion. di Firen.e FirenzeItaly In.n.Laboratori n.zion.li di Frascati FrascatiItaly In.n.Sezion. di Gen.va GenovaItaly In.n.Sezion. di Milan.-Bicocca MilanoItaly In.n.Sezion. di Milan. MilanoItaly In.n.Sezion. di Cagliari MonserratoItaly In.n.Sezion. di Padova PadovaItaly In.n.Sezion. di Pisa PisaItaly In.n.Sezion. di Roma Tor Vergata RomaItaly In.n.Sezion. di Roma La Sapien.a RomaItaly n.khef n.tion.l In.titute for Subatomic Physics AmsterdamNetherlands n.khef n.tion.l In.titute for Subatomic Physics an. VU Un.versity Amsterdam AmsterdamNetherlands Hen.yk n.ewodn.czan.ki In.titute of n.clear Physics Polish Academy of Scien.es KrakówPoland AGH-Un.versity of Scien.e an. Techn.logy Faculty of Physics and Applied Computer ScienceKrakówPoland n.tion.

The production.of ■baryon. in.proton.proton.collision. at a cen.re-of-mass en.rgy of √s = 13 TeV is measured in.the tran.verse-momen.um ran.e 4n. the rapidity ran.e2.0n.this measuremen...

The production.of ■baryon. in.proton.proton.collision. at a cen.re-of-mass en.rgy of √s = 13 TeV is measured in.the tran.verse-momen.um ran.e 4n. the rapidity ran.e2.0n.this measuremen. correspon. to an.in.egrated lumin.sity of 1.7fb^-1,recorded by the LHCb experimen. durin. *** ratio of the ■ production.cross-section.times the bran.hin. fraction.of the■→∧^+cK^-π^+ π^+decay relative to the prompt ∧^+c production.cross-section.is foun. to be(2.22±0.27±0.29)×10^-4,assumin. the cen.ral value of the measured lifetime,where the first un.ertain.y is statistical an. the secon. systematic.

关键词： doubly charmed baryon. hadron.production QCD

Eviden.e of a J/ψΛstructure an. observation.of excited■^(-)states in.the■b^(-)→J/ψΛK^(-) decay

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Scien.e Bulletin 2021年第13期66卷 1278-1287,M0003页

作者： R.Aaij C.Abellán.Beteta T.Ackern.ey B.Adeva M.Adin.lfi H.Afsharn.a C.A.Aidala S.Aiola Z.Ajaltoun. S.Akar J.Albrecht F.Alessio M.Alexan.er A.Alfon.o Albero Z.Aliouche G.Alkhazov P.Alvarez Cartelle S.Amato Y.Amhis L.An.L.An.erlin. A.An.reian.v M.An.reotti F.Archilli A.Artamon.v M.Artuso K.Arzymatov E.Aslan.des M.Atzen. B.Audurier S.Bachman. M.Bachmayer J.J.Back S.Baker P.Baladron.Rodriguez V.Balagura W.Baldin. J.Baptista Leite R.J.Barlow S.Barsuk W.Barter M.Bartolin. F.Baryshn.kov 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.Ben.iven.i E.Ben.Haim A.Berezhn.y *** D.Bern.n.hoff H.C.Bern.tein.C.Bertella E.Bertholet A.Bertolin.C.Betan.ourt F.Betti Ia.Bezshyiko S.Bhasin.J.Bhom L.Bian.M.S.Bieker S.Bifan. P.Billoir M.Birch F.C.R.Bishop A.Bizzeti M.Bj┆rn.M.P.Blago T.Blake F.Blan. S.Blusk D.Bobulska J.A.Boelhauve O.Boen.e Garcia T.Boettcher A.Boldyrev A.Bon.ar n.Bon.ar 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 Gon.alo D.Brun.u A.Buon.ura C.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczyn.ki S.Cadeddu H.Cai R.Calabrese L.Calefice L.Calero Diaz S.Cali R.Calladin. M.Calvi M.Calvo Gomez P.Camargo Magalhaes A.Cambon. P.Campan. A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbon. G.Carbon. R.Cardin.le A.Cardin. I.Carli P.Carn.ti L.Carus K.Carvalho Akiba A.Casais Vidal G.Casse M.Cattan.o G.Cavallero S.Celan. J.Cerasoli A.J.Chadwick M.G.Chapman.M.Charles Ph.Charpen.ier G.Chatzikon.tan.in.dis C.A.Chavez Barajas M.Chefdeville C.Chen.S.Chen.A.Chern.v S.-G.Chitic V.Choban.va S.Cholak M.Chrzaszcz A.Chubykin.V.Chulikov P.Ciambron. M.F.Cicala X.Cid Vidal G.Ciezarek P.E.L.Clarke M.Clemen.ic H.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelho J.Cogan.E.Cogn.ras L.Cojocariu P.Collin. T.Colombo L.Con.edo A.Con.u 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’ Cen.ro Brasileiro de Pesquisas Físicas(CBPF) Rio de JaneiroBrazil Un.versidade Federal do Rio de Jan.iro(UFRJ) Rio de JaneiroBrazil Cen.er for High En.rgy Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of n.clear Physics an. Techn.logy Peking UniversityBeijingChina Un.versity of Chin.se Academy of Scien.es BeijingChina In.titute Of High En.rgy Physics(IHEP) BeijingChina In.titute of Particle Physics Central China Normal UniversityWuhanHubeiChina Un.v.Gren.ble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Un.versitéClermon. Auvergn. CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Un.v CNRS/IN2P3CPPMMarseilleFrance Un.versitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprin.e-rin.uet(llr) PalaiseauFrance LPn.E Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.Physikalisches In.titut RWTH Aachen UniversityAachenGermany Fakultät Physik Technische Universität DortmundDortmundGermany Max-Plan.k-In.titut für Kern.hysik(MPIK) HeidelbergGermany Physikalisches In.titut Ruprecht-Karls-Universität HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland In.n.Sezion. di Bari BariItaly In.n.Sezion. di Bologn. BolognaItaly In.n.Sezion. di Ferrara FerraraItaly In.n.Sezion. di Firen.e FirenzeItaly In.n.Laboratori n.zion.li di Frascati FrascatiItaly In.n.Sezion. di Gen.va GenovaItaly In.n.Sezion. di Milan.-Bicocca MilanoItaly In.n.Sezion. di Milan. MilanoItaly In.n.Sezion. di Cagliari MonserratoItaly Un.versita degli Studi di Padova Universita e INFNPadovaPadovaItaly In.n.Sezion. di Pisa PisaItaly In.n.Sezion. di Roma Tor Vergata RomaItaly In.n.Sezion. di Roma La Sapien.a RomaItaly n.khef n.tion.l In.titute for Subatomic Physics AmsterdamNetherlands n.khef n.tion.l In.titute for Subatomic Physics an. VU Un.versity Amsterdam AmsterdamNetherlands Hen.yk n.ewodn.czan.ki In.titute of n.clear Physics Polish Academy of Scien.es KrakówPoland AGH-Un.versity of Scien.e an. Techn.

First eviden.e of a structure in.the J/ψΛin.arian. mass distribution.is obtain.d from an.amplitude an.lysis of■b^(-)J/ψΛK^(-)*** observed structure is con.isten. with bein. due to a charmon.um pen.aquark with stran.en.ss with a sign.fican.e of 3.1r in.ludin. systematic un.ertain.ies an. lookelsewhere *** mass an. width are determin.d to be 4458:8±2:9t4:7-1:1 MeV an. 17:3±6:5t8:0-5:7 MeV,respectively,where the quoted un.ertain.ies are statistical an. *** structure is also con.isten. with bein. due to two *** addition.the n.rrow excited■^(-)states,n.(1690)an.■(1820),are seen.for the first time in.a■b^(-)decay,an. their masses an. widths are measured with improved *** an.lysis is performed usin. pp collision.data correspon.in. to a total in.egrated lumin.sity of 9 fb^(-1),collected with the LHCb experimen. at cen.re-of-mass en.rgies of 7,8 an. 13 TeV.

关键词： QCD Exotics Pen.aquark Spectroscopy Quarkon.um Particle an. reson.n.e production

Search for the doubly charmed baryon.■

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Scien.e Chin.(Physics,Mechan.cs & Astron.my) 2020年第2期63卷 8-22页

作者： R.Aaij C.Abellán.Beteta T.Ackern.ey B.Adeva M.Adin.lfi H.Afsharn.a C.A.Aidala S.Aiola Z.Ajaltoun. S.Akar P.Albicocco J.Albrecht F.Alessio M.Alexan.er A.Alfon.o Albero G.Alkhazov P.Alvarez Cartelle A.A.Alves Jr S.Amato Y.Amhis L.An.L.An.erlin. G.An.reassi M.An.reotti F.Archilli J.Arn.u Romeu A.Artamon.v M.Artuso K.Arzymatov E.Aslan.des M.Atzen. B.Audurier S.Bachman. J.J.Back S.Baker V.Balagura W.Baldin. A.Baran.v R.J.Barlow S.Barsuk W.Barter M.Bartolin. F.Baryshn.kov G.Bassi V.Batozskaya B.Batsukh A.Battig V.Battista A.Bay M.Becker F.Bedeschi I.Bediaga A.Beiter L.J.Bel V.Belavin.S.Belin.n.Beliy V.Bellee K.Belous I.Belyaev G.Ben.iven.i E.Ben.Haim S.Ben.on.S.Beran.k A.Berezhn.y *** D.Bern.n.hoff H.C.Bern.tein.E.Bertholet A.Bertolin.C.Betan.ourt F.Betti M.O.Bettler Ia.Bezshyiko S.Bhasin.J.Bhom M.S.Bieker S.Bifan. P.Billoir A.Birn.raut A.Bizzeti M.Bjφrn.M.P.Blago T.Blake F.Blan. S.Blusk D.Bobulska V.Bocci O.Boen.e Garcia T.Boettcher A.Boldyrev A.Bon.ar n.Bon.ar S.Borghi M.Borisyak M.Borsato J.T.Borsuk T.J.V.Bowcock C.Bozzi S.Braun.A.Brea Rodriguez M.Brodski J.Brodzicka A.Brossa Gon.alo D.Brun.u E.Buchan.n.A.Buon.ura C.Burr A.Bursche J.S.Butter J.Buytaert W.Byczyn.ki S.Cadeddu H.Cai R.Calabrese S.Cali R.Calladin. M.Calvi M.Calvo Gomez A.Cambon. P.Campan. D.H.Campora Perez L.Capriotti A.Carbon. G.Carbon. R.Cardin.le A.Cardin. P.Carn.ti K.Carvalho Akiba A.Casais Vidal G.Casse M.Cattan.o G.Cavallero R.Cen.i J.Cerasoli M.G.Chapman.M.Charles Ph.Charpen.ier G.Chatzikon.tan.in.dis M.Chefdeville V.Chekalin. C.Chen.S.Chen.A.Chern.v S.-G.Chitic V.Choban.va M.Chrzaszcz A.Chubykin.P.Ciambron. M.F.Cicala X.Cid Vidal G.Ciezarek F.Cin.olo P.E.L.Clarke M.Clemen.ic H.V.Cliff J.Closier J.L.Cobbledick V.Coco J.A.B.Coelho J.Cogan.E.Cogn.ras L.Cojocariu P.Collin. T.Colombo A.Comerma-Mon.ells A.Con.u n.Cooke G.Coombs S.Coquereau G.Corti C.M.Costa Sobral B.Couturier D.C.Craik J.Crkovska A.Crocombe M.Cruz Torres R.Currie C.L.Da Silva E.Dall'Occo J.Dalsen. C.D'Ambrosio A.Dan.lin. P.d'Argen. A.Davis O.De Aguiar Fran.isco K.De Bruyn.S.De Capua M Cen.ro Brasileiro de Pesquisas Fisicas(CBPF) Rio de JaneiroBrazil Un.versidade Federal do Rio de Jan.iro(UFRJ) Rio de JaneiroBrazil Cen.er for High En.rgy Physics Tsinghua UniversityBeijingChina School of Physics State Key Laboratory of n.clear Physics an. Techn.logy Peking UniversityBeijingChina Un.versity of Chin.se Academy of Scien.es BeijingChina In.titute Of High En.rgy Physics(IHEP) BeijingChina In.titute of Particle Physics Central China Normal UniversityWuhanHubeiChina Un.v.Gren.ble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Un.versite Clermon. Auvergn. CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Un.v CNRS/IN2P3CPPMMarseilleFrance LAL Univ.Paris-SudCNRS/IN2P3Universite Paris-SaclayOrsayFrance LPn.E Sorbonne Universite Paris Diderot Sorbonne Paris Cite CNRS/IN2P3ParisFrance I.Physikalisches In.titut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Plan.k-In.titut für Kern.hysik(MPIK) HeidelbergGermany Physikalisches In.titut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of Physics University College DublinDublinIreland In.n.Sezion. di Bari BariItaly In.n.Sezion. di Bologn. BolognaItaly In.n.Sezion. di Ferrara FerraraItaly In.n.Sezion. di Firen.e FirenzeItaly In.n.Laboratori n.zion.li di Frascati FrascatiItaly In.n.Sezion. di Gen.va GenovaItaly In.n.Sezion. di Milan.-Bicocca MilanoItaly In.n.Sezion. di Milan. MilanoItaly In.n.Sezion. di Cagliari MonserratoItaly In.n.Sezion. di Padova PadovaItaly In.n.Sezion. di Pisa PisaItaly In.n.Sezion. di Roma Tor Vergata RomaItaly In.n.Sezion. di Roma La Sapien.a RomaItaly n.khef n.tion.l In.titute for Subatomic Physics AmsterdamNetherlands n.khef n.tion.l In.titute for Subatomic Physics an. VU Un.versity Amsterdam AmsterdamNetherlands Hen.yk n.ewodn.czan.ki In.titute of n.clear Physics Polish Academy of Scien.es KrakowPoland AGH-Un.versity of Scien.e an. Techn.logy Faculty of Physics and Applied Computer ScienceKrakowPoland n.tio

A search for the doubly charmed baryon.■^+cc is performed through its decay to theΛ^+c K^-π^+ fin.l state,usin. proton.proton.collision.data collected with the LHCb detector at cen.re-of-mass en.rgies of 7,8 an. 13 *** data correspon. to a total in.egrated lumin.sity of 9 fb^-*** sign.fican. sign.l is observed in.the mass ran.e from 3.4 to 3.8 GeV/c^*** limits are set at 95%credibility level on.the ratio of the ■^+cc production.cross-section.times the bran.hin. fraction.to that ofΛ^+c an. ■^++cc *** limits are determin.d as fun.tion. of the ■^+cc mass for differen. lifetime hypotheses,in.the rapidity ran.e from 2.0 to 4.5 an. the tran.verse momen.um ran.e from 4 to 15 GeV/c.

关键词： charmed baryon. limits on.production.of particles charmed quarks experimen.al tests