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Search for the rare decay b^(0)→J/ψФ

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Chinese physics C 2021年第4期45卷 47-60页

作者： R.Aaij C.Abellin beteta T.Ackernley b.Adeva M.Adinolfi H.Afsharnial 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.bachmaver J.J.back S.baker P.baladron Rodriguez V.balagura W.baldinit 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.bedeschis I.bediaga A.beiter V.belavin S.belin V.bellee K.belous I.belov I.belyaev G.bencivenni E.ben-Haim A.berezhnoy *** D.berninghoff H.C.bernstein C.bertella E.bertholet A.bertolin C.betancourt F.betti M.O.bettler Ia.bezshyiko S.bhasin J.bhom L.bian M.S.bieker S.bifani P.billoir M.birch F.C.R.bishop A.bizzeti M.biorn 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 Rodriguezs M.brodski J.brodzicka A.brossa Gonzalo D.brundu A.buonaura C.burr A.burschee 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 D.H.Campora Perez A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbonel G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti L.Carus K.Carvalho 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.Crkovska M.Cruz Centro brasileiro de Pesquisas Fisicas(CbPF) Riode JaneiroBrazil Universidade Federal do Riode Janeiro(UFRJ) Riode JaneiroBrazil Center for High Energy physics Tsinghua UniversityBeijingChina School of physics State Key Laboratory of Nuclear physics and Technology Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute Of High Energy physics(IHEP) BejingChina Institute of Particle physics Central China Normal UniversityWuhanHubeiChina Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance Universite Clermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Universitq Paris-Saclay CNRS/IN2P3IJCLabOrsayFrance LPNHE Sorbonne UniversiteParis Diderot Sorbonne Paris CiteCNRS/IN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut fir Kernphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of physics University College DublinDublinIreland INFN Sezione di bari BariItaly INFN Sezione di bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati Frascatiltaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano bicocca Milanolaly INFN Sezione di Milano MilanoItaly INFN Sezione di Cagliari Monserratoltaly Universita degli Studi di Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma Tor Vergata RomaItaly INFN Sezione di Roma La Sapienza RomaItaly 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 KrakowPoland AGH-University of Science and Technology Faculty of Physics and Applied Computer Science

A search for the rare decay b^(0)→J/ψФis performed using Pp collision data collected with the LHCb dete-ctor at centre-of-mass energies of 7,8 and 13 TeV,corresponding to an integrated luminosity of9 *** significant signal of the decay is observed and an upper limitof 1.1x 10^(-7)at 90%confidence level is set on the branching fraction.

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

Exclusive production of b_c mesons in e^+e^- colliders

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Chinese physics C 2018年第8期42卷 88-98页

作者：魏焰冰李润辉罗丹吕才典沈月龙 Institute of High Energy physics CAS School of physics University of Chinese Academy of Sciences School of Physical Science and Technology Inner Mongolia University College of Information Science and Engineering Ocean University of China

Within the framework of the perturbative QCD approach,we calculate the time-like b（c ）bc（bc＊）form factors F（Q^2）and A2（Q^2）.We include relativistic corrections and QCD corrections,either of which can give about20%correction to the leading-order contribution,but there are cancellation effects between *** calculate the cross sections of the e^＋e^-→bc-bc＋（bc＊＋）*** cross sections are enhanced at the Z pole to beσ^（P P）（Q=m Z）～1.3×10^-5pb andσ^（P V）（Q=m Z）～2.5×10^-5pb,which are still too small to be detected by proposed e~＋e^-colliders such as the Circular Electron Positron Collider.

关键词： PQCD b physics form factor

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

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Chinese physics C 2023年第9期47卷 1-13页

作者： R.Aaij A.S.W.Abdelmotteleb C.Abellan beteta F.Abudinén T.Ackernley b.Adeva M.Adinolfi H.Afsharnia C.Agapopoulou C.A.Aidala S.Aiola Z.Ajaltouni S.Akar K.Akiba J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche P.Alvarez Cartelle S.Amato J.L.Amey Y.Amhis L.An L.Anderlini M.Andersson A.Andreianov M.Andreotti D.Andreou D.Ao F.Archilli A.Artamonov M.Artuso E.Aslanides M.Atzeni b.Audurier S.bachmann M.bachmayer J.J.back A.bailly-reyre P.baladron Rodriguez V.balagura W.baldini J.baptista de Souza Leite M.barbetti R.J.barlow S.barsuk W.barter M.bartolini F.baryshnikov 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.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 N.V.biesuz S.bifani P.billoir A.biolchini M.birch F.C.R.bishop A.bitadze A.bizzeti M.P.blago T.blake F.blanc S.blusk D.bobulska J.A.boelhauve O.boente Garcia T.boettcher A.boldyrev N.bondar 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 Gonzalo D.brundu A.buonaura L.buonincontri A.T.burke C.burr A.bursche A.butkevich J.S.butter J.buytaert W.byczynski S.Cadeddu H.Cai R.Calabrese L.Calefice S.Cali R.Calladine M.Calvi M.Calvo Gomez P.Camargo Magalhaes P.Campana D.H.Campora Perez A.F.Campoverde Quezada S.Capelli L.Capriotti A.Carbone G.Carboni R.Cardinale A.Cardini I.Carli P.Carniti L.Carus A.Casais Vidal R.Caspary G.Casse M.Cattaneo G.Cavallero V.Cavallini S.Celani J.Cerasoli D.Cervenkov A.J.Chadwick M.G.Chapman M.Charles Ph.Charpentier C.A.Chavez barajas M.Chefdeville C.Chen S.Chen A.Chernov S.Chernyshenko V.Chobanova S.Cholak M.Chrzaszcz A.Chubykin V.Chulikov P.Ciambrone M.F.Cicala X.Cid Vidal G.Ciezarek G.Ciullo 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 Centro brasileiro de Pesquisas Físicas(CbPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy physics Tsinghua UniversityBeijingChina Institute Of High Energy physics(IHEP) BeijingChina School of physics State Key Laboratory of Nuclear physics and Technology Peking UniversityBeijingChina University of Chinese Academy of Sciences BeijingChina Institute of Particle physics Central China Normal UniversityWuhanHubeiChina Université Savoie Mont blanc CNRSIN2P3-LAPPAnnecyFrance UniversitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance UniversitéParis-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance LPNHE Sorbonne UniversitéParis Diderot Sorbonne Paris CitéCNRS/IN2P3ParisFrance I.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 MilanoItaly INFN Sezione di Milano-bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Universitàdegli Studi di Padova Universitàe INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor Vergata RomaItaly Nikhef National Institute for Subatomic physics AmsterdamNetherlands Nikhef National Institute for Subatomic physics and VU University Amsterdam AmsterdamNetherlands AGH-University of Science and Technology Faculty of Physics and Applied Computer Scienc

A first search for the Ξ_(bc)^(+)J/ψΞ_(c)^(+) decay is performed by the LHCb experiment with a data sample of proton-proton collisions, corresponding to an integrated luminosity of 9 fb−1 recorded at centre-of-mass energies of 7, 8, and 13 TeV. Two peaking structures are seen with a local (global) significance of 4.3(2.8) and 4.1(2.4) standard deviations at masses of 6571 and 6694 MeV/c2, respectively. Upper limits are set on the Ξ+bc baryon production cross-section times the branching fraction relative to that of the b+c→J/ψD+s decay at centre-of-mass energies of 8 and 13 TeV, in the Ξ+bc and in the b+c rapidity and transverse-momentum ranges from 2.0 to 4.5 and 0 to 20GeV/c, respectively. Upper limits are presented as a function of the Ξ+bc mass and lifetime.

关键词： QCD b physics charm physics spectroscopy

b meson rare decays in the TNMSSM

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Chinese physics C 2024年第5期48卷 72-91页

作者：陈海翔高生恺朱宁宇张兆阳胡怀聪 School of Physical Science and Technology Guangxi UniversityNanning 530004China

We investigate the two loop electroweak corrections to b meson rare decays b¯→Xsγand b0s→μ+μ−in the minimal supersymmetry standard model(MSSM)extension with two triplets and one singlet(TNMSSM).The new particle contents and interactions in the TNMSSM can affect the theoretical predictions of the branching ratios br(b¯→Xsγ)and br(b0s→μ+μ−),and the corrections from two loop diagrams to the process b¯→Xsγcan reach around 4%.Considering the latest experimental measurements,the numerical results of br(b¯→Xsγ)and br(b0s→μ+μ−)in the TNMSSM are presented and *** findings indicate that the results in the TNMSSM can fit the updated experimental data well,and the new parameters Tλ,κ,λ,clearly affect the theoretical predictions of br(b¯→Xsγ)and br(b0s→μ+μ−).

关键词： supersymmetry b physics rare decays

Revisiting radiative leptonic b decay

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Chinese physics C 2020年第12期44卷 88-96页

作者： Yue-Long Shen Yan-bing Wei Xue-Chen Zhao Si-Hong Zhou College of Information Science and Engineering Ocean University of ChinaQingdao 266100China School of physics Nankai UniversityWeijin Road 94Tianjin 300071China School of Physical Science and Technology Inner Mongolia UniversityHohhot 010021China

In this paper,we summarize the existing methods of solving the evolution equation of the leading-twist b-meson ***,in the Mellin space,we derive a factorization formula with next-to-leading-logarithmic(NLL)resummation for the form factors FA,V in the b→γℓνdecay at leading power inΛ/***,we investigate the power suppressed local contributions,factorizable non-local contributions(which are suppressed by 1/Eγand 1/mb),and soft contributions to the form *** the numerical analysis,which employs the two-loop-level hard function and the jet function,we find that both the resummation effect and the power corrections can sizably decrease the form ***,the integrated branching ratios are also calculated for comparison with future experimental data.

关键词： b physics RG equation QCD factorization form factors

Search for the doubly heavy baryons Ω^(0)_(bc) and E^(0)_(bc) decaying to Λ^(+)_(c)π^(-) and E^(+)_(c)π^(-)

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Chinese physics C 2021年第9期45卷 10-21页

作者： R.Aaij C.Abelian beteta T.Ackernley b.Adeva M.Adinolfi H.Afshamia C.A.Aidala S.Aiola Z.Ajaltouni S.Aka J.Albrecht F.Alessio M.Alexander A.Alfonso Albero Z.Aliouche G.Alkhazov P.Alvarez Cartelie 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.beminghoff 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.bjorn 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.Camiti 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.Crkovska M.Cruz Torres R.Currie C.L.Da Silva E.Dall'Occo J.Dalseno C.D'Ambrosi Centro brasileiro de Pesquisas Fisicas(CbPF) Rio de JaneiroBrazil Universidade Federal do Rio de Janeiro(UFRJ) Rio de JaneiroBrazil Center for High Energy physics Tsinghua UniversityBeijingChina Institute of High Energy physics(IHEP) BeijingChina School of physics State Key Laboratory of Nuclear physics and Technology Peking UniversityBeijingChina University ofChinese Academy of Sciences BeijingChina Institute of Particle physics Central China Normal UniversityWuhanHubeiChina Univ.Savoie Mont blanc CNRSIN2P3-LAPPAnnecyFrance Universite Clermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Aix Marseille Univ CNRS/IN2P3CPPMMarseilleFrance Universite Paris-Saclay CNRS/IN2P3IJCLabOrsayFrance Laboratoire Leprince-Ringuet CNRS/IN2P3Ecole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance LPNHE Sorbonne UniversiteParis Diderot Sorbonne Paris CiteCNRS/FN2P3ParisFrance I.Physikalisches Institut RWTH Aachen UniversityAachenGermany Fakultat Physik Technische Universitat DortmundDortmundGermany Max-Planck-Institut für Kemphysik(MPIK) HeidelbergGermany Physikalisches Institut Ruprecht-Karls-Universitat HeidelbergHeidelbergGermany School of physics University College DublinDublinIreland INFN Sezione di bari BariItaly INFN Sezione di bologna BolognaItaly INFN Sezione di Ferrara FerraraItaly INFN Sezione di Firenze FirenzeItaly INFN Laboratori Nazionali di Frascati FrascatiItaly INFN Sezione di Genova GenovaItaly INFN Sezione di Milano MilanoItaly INFN Sezione di Milano-bicocca MilanoItaly INFN Sezione di Cagliari MonserratoItaly Universita degli Studi di Padova Universita e INFNPadovaPadovaItaly INFN Sezione di Pisa PisaItaly INFN Sezione di Roma La Sapienza RomaItaly INFN Sezione di Roma Tor Vergata RomaItaly Nikhef National Institute for Subatomic physics AmsterdamNetherlands Nikhef National Institute for Subatomic physics and VU University Amsterdam AmsterdamNetherlands AGH-University of Science and Technology Faculty of Physics and Applied Computer ScienceKr

The first search for the doubly heavyΩ^(0)_(bc)baryon and a search for the E^(0)_(bc)baryon are performed using pp collision data collected via the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13 TeV,corresponding to an integrated luminosity of 5.2 fb^(-1).The baryons are reconstructed via their decays to Λ^(+)_(c)π^(-)and E^(+)_(c)π^(-).No significant excess is fbund for invariant masses between 6700 and 7300 MeV/c^(2),in a rapidity range from 2.0 to 4.5 and a transverse momentum range from 2 to 20 MeV/*** limits are set on the ratio of the Ω^(0)_(bc)and E^(0)_(bc)production cross-section times the branching fraction to Λ^(+)_(c)π^(-)(E^(+)_(c)π^(-))relative to that of the Λ^(0)_(b)(E^(0)_(b))baryon,for different lifetime hypotheses,at 95%confidence *** upper limits range 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,and 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,depending on the considered mass and lifetime of theΩ^(0)_(bc)(E^(0)_(bc))baryon.

关键词： b physics quarkonium spectroscopy heavy quark production