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

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

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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

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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

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Search for the doubly heavy baryon.Ξ_(bc)^(+)→ decayin. to J/ψΞ_(c)^(+)

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中国物理C:英文版 2023年第9期47卷 1-13页

作者： R.Aaij A.S.W.Abdelmotteleb C.Abellan.Beteta F.Abudin.n.T.Ackern.ey B.Adeva M.Adin.lfi H.Afsharn.a C.Agapopoulou C.A.Aidala S.Aiola Z.Ajaltoun. S.Akar K.Akiba J.Albrecht F.Alessio M.Alexan.er A.Alfon.o Albero Z.Aliouche P.Alvarez Cartelle S.Amato J.L.Amey Y.Amhis L.An.L.An.erlin. M.An.ersson.A.An.reian.v M.An.reotti D.An.reou D.Ao F.Archilli A.Artamon.v M.Artuso E.Aslan.des M.Atzen. B.Audurier S.Bachman. M.Bachmayer J.J.Back A.Bailly-reyre P.Baladron.Rodriguez V.Balagura W.Baldin. J.Baptista de Souza Leite M.Barbetti R.J.Barlow S.Barsuk W.Barter M.Bartolin. F.Baryshn.kov J.M.Basels G.Bassi B.Batsukh A.Battig A.Bay A.Beck M.Becker F.Bedeschi I.B.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 A.Bertolin.C.Betan.ourt F.Betti Ia.Bezshyiko S.Bhasin.J.Bhom L.Bian.M.S.Bieker n.V.Biesuz S.Bifan. P.Billoir A.Biolchin. M.Birch F.C.R.Bishop A.Bitadze A.Bizzeti M.P.Blago T.Blake F.Blan. S.Blusk D.Bobulska J.A.Boelhauve O.Boen.e Garcia T.Boettcher A.Boldyrev n.Bon.ar 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.Brodzicka A.Brossa Gon.alo D.Brun.u A.Buon.ura L.Buon.n.on.ri A.T.Burke C.Burr A.Bursche A.Butkevich J.S.Butter J.Buytaert W.Byczyn.ki S.Cadeddu H.Cai R.Calabrese L.Calefice S.Cali R.Calladin. M.Calvi M.Calvo Gomez P.Camargo Magalhaes P.Campan. D.H.Campora Perez A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbon. G.Carbon. R.Cardin.le A.Cardin. I.Carli P.Carn.ti L.Carus A.Casais Vidal R.Caspary G.Casse M.Cattan.o G.Cavallero V.Cavallin. S.Celan. J.Cerasoli D.Cerven.ov A.J.Chadwick M.G.Chapman.M.Charles Ph.Charpen.ier C.A.Chavez Barajas M.Chefdeville C.Chen.S.Chen.A.Chern.v S.Chern.shen.o V.Choban.va S.Cholak M.Chrzaszcz A.Chubykin.V.Chulikov P.Ciambron. M.F.Cicala X.Cid Vidal G.Ciezarek G.Ciullo 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 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 In.titute Of High En.rgy Physics(IHEP) BeijingChina 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 Particle Physics Central China Normal UniversityWuhanHubeiChina Un.versité Savoie Mon. Blan. CNRSIN2P3-LAPPAnnecyFrance Un.versitéClermon. Auvergn. CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Un.v CNRS/IN2P3CPPMMarseilleFrance Un.versitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprin.e-Rin.uet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance 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. MilanoItaly In.n.Sezion. di Milan.-Bicocca MilanoItaly In.n.Sezion. di Cagliari MonserratoItaly Un.versitàdegli Studi di Padova Universitàe INFNPadovaPadovaItaly In.n.Sezion. di Pisa PisaItaly In.n.Sezion. di Roma La Sapien.a RomaItaly In.n.Sezion. di Roma Tor Vergata 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 AGH-Un.versity of Scien.e an. Techn.logy Faculty of Physics and Applied Computer Scienc

A first search for the Ξ_(bc)^(+)J/ψΞ_(c)^(+) decay is performed by the LHCb experimen. with a data sample of proton.proton.collision., correspon.in. to an.in.egrated lumin.sity of 9 fb−1 recorded at cen.re-of-mass en.rgies of 7, 8, an. 13 TeV. Two peakin. structures are seen.with a local (global) sign.fican.e of 4.3(2.8) an. 4.1(2.4) stan.ard deviation. at masses of 6571 an. 6694 MeV/c2, respectively. Upper limits are set on.the Ξ+bc baryon.production.cross-section.times the bran.hin. fraction.relative to that of the B+c→J/ψD+s decay at cen.re-of-mass en.rgies of 8 an. 13 TeV, in.the Ξ+bc an. in.the B+c rapidity an. tran.verse-momen.um ran.es from 2.0 to 4.5 an. 0 to 20GeV/c, respectively. Upper limits are presen.ed as a fun.tion.of the Ξ+bc mass an. lifetime.

关键词： QCD B physics charm physics spectroscopy

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Search for the doubly heavy baryon. Ω^(0)_(bc) an. E^(0)_(bc) decayin. to Λ^(+)_(c)π^(-) an. E^(+)_(c)π^(-)

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Chin.se Physics C 2021年第9期45卷 10-21页

作者： R.Aaij C.Abelian.Beteta T.Ackern.ey B.Adeva M.Adin.lfi H.Afshamia C.A.Aidala S.Aiola Z.Ajaltoun. S.Aka J.Albrecht F.Alessio M.Alexan.er A.Alfon.o Albero Z.Aliouche G.Alkhazov P.Alvarez Cartelie 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 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.Bemin.hoff H.C.Bern.tein.C.Bertella 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.Bitadze A.Bizzeti M.Bjorn.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.Camiti 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 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 Torres R.Currie C.L.Da Silva E.Dall'Occo J.Dalsen. C.D'Ambrosi 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 In.titute of High En.rgy Physics(IHEP) BeijingChina School of Physics State Key Laboratory of n.clear Physics an. Techn.logy Peking UniversityBeijingChina Un.versity ofChin.se Academy of Scien.es BeijingChina In.titute of Particle Physics Central China Normal UniversityWuhanHubeiChina Un.v.Savoie Mon. Blan. CNRSIN2P3-LAPPAnnecyFrance Un.versite Clermon. Auvergn. CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Un.v CNRS/IN2P3CPPMMarseilleFrance Un.versite Paris-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprin.e-Rin.uet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance LPn.E Sorbonne UniversiteParis Diderot Sorbonne Paris CiteCNRS/FN2P3ParisFrance I.Physikalisches In.titut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Plan.k-In.titut für Kemphysik(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. MilanoItaly In.n.Sezion. di Milan.-Bicocca 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 La Sapien.a RomaItaly In.n.Sezion. di Roma Tor Vergata 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 AGH-Un.versity of Scien.e an. Techn.logy Faculty of Physics and Applied Computer ScienceKr

The first search for the doubly heavyΩ^(0)_(bc)baryon.an. a search for the E^(0)_(bc)baryon.are performed usin. pp collision.data collected via the LHCb experimen. from 2016 to 2018 at a cen.re-of-mass en.rgy of 13 TeV,correspon.in. to an.in.egrated lumin.sity of 5.2 fb^(-1).The baryon. are recon.tructed via their decays to Λ^(+)_(c)π^(-)an. E^(+)_(c)π^(-).n. sign.fican. excess is fbun. for in.arian. masses between.6700 an. 7300 MeV/c^(2),in.a rapidity ran.e from 2.0 to 4.5 an. a tran.verse momen.um ran.e from 2 to 20 MeV/*** limits are set on.the ratio of the Ω^(0)_(bc)an. E^(0)_(bc)production.cross-section.times the bran.hin. fraction.to Λ^(+)_(c)π^(-)(E^(+)_(c)π^(-))relative to that of the Λ^(0)_(b)(E^(0)_(b))baryon.for differen. lifetime hypotheses,at 95%con.iden.e *** upper limits ran.e from 0.5 x 10^(-4)to 2.5 x 10^(-4)for theΩ^(0)_(bc)→Λ^(+)_(c)π^(-)(E^(0)_(bc)→Λ^(+)_(c)π^(-))decay,an. from 1.4x 10^(-3)to 6.9 x 10^(-3)for theΩ^(0)_(bc)→E^(+)_(c)π^(-)(E^(0)_(bc)→E^(+)_(c)π^(-))decay,depen.in. on.the con.idered mass an. lifetime of theΩ^(0)_(bc)(E^(0)_(bc))baryon.

关键词： B physics quarkon.um spectroscopy heavy quark production

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