Observation of the Doubly Charmed Baryon Ξcc++

被引：419

作者：

Aaij, R. ^{[42
]}

Adeva, B. ^{[41
]}

Adinolfi, M. ^{[50
]}

Ajaltouni, Z.

Akar, S. ^{[60
]}

Albrecht, J. ^{[11
]}

Alessio, F. ^{[42
]}

Alexander, M. ^{[55
]}

Albero, A. Alfonso ^{[40
]}

Ali, S. ^{[45
]}

Alkhazov, G. ^{[32
]}

Cartelle, P. Alvarez ^{[57
]}

Amato, S. ^{[2
]}

Amerio, S. ^{[24
]}

Amhis, Y. ^{[7
]}

An, L. ^{[3
]}

Anderlini, L. ^{[19
]}

Andreassi, G. ^{[43
]}

Andreotti, M. ^{[18
,82
]}

Andrews, J. E. ^{[61
]}

Appleby, R. B. ^{[58
]}

Archilli, F. ^{[45
]}

d'Argent, P. ^{[13
]}

Romeu, J. Arnau ^{[6
]}

Artamonov, A. ^{[39
]}

Artuso, M. ^{[62
]}

Aslanides, E. ^{[6
]}

Auriemma, G. ^{[27
]}

Baalouch, M.

Babuschkin, I. ^{[58
]}

Bachmann, S. ^{[13
]}

Back, J. J. ^{[52
]}

Badalov, A. ^{[40
]}

Baesso, C. ^{[63
,64
]}

Baker, S. ^{[57
]}

Balagura, V. ^{[7
,83
]}

Baldini, W. ^{[18
]}

Baranov, A. ^{[37
]}

Barlow, R. J. ^{[58
]}

Barschel, C. ^{[42
]}

Barsuk, S. ^{[7
]}

Barter, W. ^{[58
]}

Baryshnikov, F. ^{[33
]}

Batozskaya, V. ^{[30
]}

Battista, V. ^{[43
]}

Bay, A. ^{[43
]}

Beaucourt, L. ^{[4
]}

Beddow, J. ^{[55
]}

Bedeschi, F. ^{[25
]}

Bediaga, I. ^{[1
]}

机构：

[1] Ctr Brasileiro Pesquisas Fisicas CBPF, Rio De Janeiro, Brazil

[2] Univ Fed Rio Janeiro UFRJ, Rio De Janeiro, Brazil

[3] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China

[4] Univ Savoie Mont Blanc, CNRS, 4LAPP, Annecy Le Vieux, France

[5] Clermont Univ, Univ Blaise Pascal, CNRS IN2P3, LPC, Clermont Ferrand, France

[6] Aix Marseille Univ, CNRS IN2P3, CPPM, Marseille, France

[7] Univ Paris Sud, CNRS IN2P3, LAL, Orsay, France

[8] Univ Paris Diderot, CNRS IN2P3, LPNHE, Paris, France

[9] Univ Paris 06, CNRS IN2P3, LPNHE, Paris, France

[10] Rhein Westfal TH Aachen, I Physikal Inst, Aachen, Germany

[11] Tech Univ Dortmund, Fak Phys, Dortmund, Germany

[12] Max Planck Inst Kernphysik MPIK, Heidelberg, Germany

[13] Heidelberg Univ, Physikal Inst, Heidelberg, Germany

[14] Univ Coll Dublin, Sch Phys, Dublin, Ireland

[15] Sezione INFN Bari, Bari, Italy

[16] Sezione INFN Bologna, Bologna, Italy

[17] Sezione INFN Cagliari, Cagliari, Italy

[18] Univ INFN, Ferrara, Italy

[19] Sezione INFN Firenze, Florence, Italy

[20] Lab Nazl INFN Frascati, Frascati, Italy

[21] Sezione INFN Genova, Genoa, Italy

[22] Univ INFN, Milano Bicocca, Milan, Italy

[23] Sezione Milano, Milan, Italy

[24] Sezione INFN Padova, Padua, Italy

[25] Sezione INFN Pisa, Pisa, Italy

[26] Sezione INFN Roma Tor Vergata, Rome, Italy

[27] Sezione INFN Roma Sapienza, Rome, Italy

[28] Henryk Niewodniczanski Inst Nucl Phys Polish Acad, Krakow, Poland

[29] AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, Krakow, Poland

[30] Natl Ctr Nucl Res NCBJ, Warsaw, Poland

[31] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest, Romania

[32] Petersburg Nucl Phys Inst PNPI, Gatchina, Russia

[33] Inst Theoret & Expt Phys ITEP, Moscow, Russia

[34] Moscow State Univ SINP MSU, Inst Nucl Phys, Moscow, Russia

[35] Russian Acad Sci INR RAN, Inst Nucl Res, Moscow, Russia

[36] Russian Acad Sci INR RAN, Inst Nucl Res, Moscow, Russia

[37] Yandex Sch Data Anal, Moscow, Russia

[38] Budker Inst Nucl Phys SB RAS, Novosibirsk, Russia

[39] Inst High Energy Phys IHEP, Protvino, Russia

[40] Univ Barcelona, ICCUB, Barcelona, Spain

[41] Univ Santiago Compostela, Santiago De Compostela, Spain

[42] European Org Nucl Res CERN, Geneva, Switzerland

[43] Ecole Polytechn Fede Lausanne EPFL, Inst Phys, Lausanne, Switzerland

[44] Univ Zurich, Phys Inst, CH-8006 Zurich, Switzerland

[45] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands

[46] Univ Amsterdam, Nikhef Natl Inst Subat Phys & VU, Kruislaan 403, NL-1009 AT Amsterdam, Netherlands

[47] NSC Kharkiv Inst Phys & Technol NSC KIPT, Kharkov, Ukraine

[48] Natl Acad Sci KINR, Inst Nucl Res, Kiev, Ukraine

[49] Univ Birmingham, Birmingham B15 2TT, W Midlands, England

[50] Univ Bristol, HH Wills Phys Lab, Bristol, Avon, England

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 11期

关键词：

HADRONIC PRODUCTION; HEAVY BARYONS; MONTE-CARLO; DECAY; SPECTROSCOPY; GENERATOR; GENXICC; VERSION; XI(CC); MASSES;

D O I：

10.1103/PhysRevLett.119.112001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A highly significant structure is observed in the Lambda K-+(c)-pi(+)pi(+) mass spectrum, where the Lambda(+)(c) baryon is reconstructed in the decay mode pK(-)pi(+). The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon Xi(++)(cc). The difference between the masses of the Xi(++)(cc) and Lambda(+)(c) states is measured to be 1334.94 +/- 0.72(stat.) +/- 0.27(syst.) MeV/c(2), and the Xi(++)(cc) mass is then determined to be 3621.40 +/- 0.72(stat.) +/- 0.27(syst.) +/- 0.14(Lambda(+)(c)) MeV/c(2), where the last uncertainty is due to the limited knowledge of the Lambda(+)(c) mass. The state is observed in a sample of proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.7 fb(-1), and confirmed in an additional sample of data collected at 8 TeV.

引用

页数：10

共 71 条

[1] LHCb detector performance [J].

Aaij, R. ;

Adeva, B. ;

Adinolfi, M. ;

Affolder, A. ;

Ajaltouni, Z. ;

Akar, S. ;

Albrecht, J. ;

Alessio, F. ;

Alexander, M. ;

Ali, S. ;

Alkhazov, G. ;

Alvarez Cartelle, P. ;

Alves, A. A., Jr. ;

Amato, S. ;

Amerio, S. ;

Amhis, Y. ;

An, L. ;

Anderlini, L. ;

Anderson, J. ;

Andreassen, R. ;

Andreotti, M. ;

Andrews, J. E. ;

Appleby, R. B. ;

Gutierrez, O. Aquines ;

Archilli, F. ;

Artamonov, A. ;

Artuso, M. ;

Aslanides, E. ;

Auriemma, G. ;

Baalouch, M. ;

Bachmann, S. ;

Back, J. J. ;

Badalov, A. ;

Baesso, C. ;

Baldini, W. ;

Barlow, R. J. ;

Barschel, C. ;

Barsuk, S. ;

Barter, W. ;

Batozskaya, V. ;

Battista, V. ;

Bay, A. ;

Beaucourt, L. ;

Beddow, J. ;

Bedeschi, F. ;

Bediaga, I. ;

Belogurov, S. ;

Belous, K. ;

Belyaev, I. ;

Ben-Haim, E. .

INTERNATIONAL JOURNAL OF MODERN PHYSICS A, 2015, 30 (07)

[2] Precision measurement of D meson mass differences [J].

Aaij, R. ;

Beteta, C. Abellan ;

Adeva, B. ;

Adinolfi, M. ;

Adrover, C. ;

Affolder, A. ;

Ajaltouni, Z. ;

Albrecht, J. ;

Alessio, F. ;

Alexander, M. ;

Ali, S. ;

Alkhazov, G. ;

Cartelle, P. Alvarez ;

Alves, A. A. ;

Amato, S. ;

Amerio, S. ;

Amhis, Y. ;

Anderlini, L. ;

Anderson, J. ;

Andreassen, R. ;

Appleby, R. B. ;

Gutierrez, O. Aquines ;

Archilli, F. ;

Artamonov, A. ;

Artuso, M. ;

Aslanides, E. ;

Auriemmam, G. ;

Bachmann, S. ;

Back, J. J. ;

Baesso, C. ;

Balagura, V. ;

Baldini, W. ;

Barlow, R. J. ;

Barsche, C. ;

Barsuk, S. ;

Barter, W. ;

Bauer, Th. ;

Bay, A. ;

Beddow, J. ;

Bedeschi, F. ;

Bediagal, I. ;

Belogurov, S. ;

Belous, K. ;

Belyaev, I. ;

Ben-Haim, E. ;

Benayoun, M. ;

Bencivenni, G. ;

Benson, S. ;

Benton, J. ;

Berezhnoy, A. .

JOURNAL OF HIGH ENERGY PHYSICS, 2013, (06)

[3] The LHCb trigger and its performance in 2011 [J].

Aaij, R. ;

Albrecht, J. ;

Alessio, F. ;

Amato, S. ;

Aslanides, E. ;

Belyaev, I. ;

van Beuzekom, M. ;

Bonaccorsi, E. ;

Bonnefoy, R. ;

Brarda, L. ;

Callot, O. ;

Cattaneo, M. ;

Chanal, H. ;

Chebbi, M. ;

Cid Vidal, X. ;

Clemencic, M. ;

Closier, J. ;

Coco, V. ;

Cogan, J. ;

Deschamps, O. ;

Dijkstra, H. ;

Drancourt, C. ;

Dzhelyadin, R. ;

Frank, M. ;

Gandelman, M. ;

Gaspar, C. ;

Gligorov, V. V. ;

Goebel, C. ;

Cardoso, L. A. Granado ;

Guz, Yu. ;

Haen, C. ;

He, J. ;

van Herwijnen, E. ;

Hulsbergen, W. ;

Jacobsson, R. ;

Jost, B. ;

Karbach, T. M. ;

Kerzel, U. ;

Koppenburg, P. ;

Krocker, G. ;

Langenbruch, C. ;

Lax, I. ;

Le Gac, R. ;

Lefevre, R. ;

Lefranccois, J. ;

Leroy, O. ;

Gioi, L. Li ;

Liu, G. ;

Machefert, F. ;

Machikhiliyan, I. V. .

JOURNAL OF INSTRUMENTATION, 2013, 8

[4] Measurement of b-hadron masses [J].

Aaij, R. ;

Beteta, C. Abellan ;

Adeva, B. ;

Adinolfi, M. ;

Adrover, C. ;

Affolder, A. ;

Ajaltouni, Z. ;

Albrecht, J. ;

Alessio, F. ;

Alexander, M. ;

Alkhazov, G. ;

Cartelle, P. Alvarez ;

Alves, A. A., Jr. ;

Amato, S. ;

Amhis, Y. ;

Anderson, J. ;

Appleby, R. B. ;

Gutierrez, O. Aquines ;

Archilli, F. ;

Arrabito, L. ;

Artamonov, A. ;

Artuso, M. ;

Aslanides, E. ;

Auriemma, G. ;

Bachmann, S. ;

Back, J. J. ;

Bailey, D. S. ;

Balagura, V. ;

Baldini, W. ;

Barlow, R. J. ;

Barschel, C. ;

Barsuk, S. ;

Barter, W. ;

Bates, A. ;

Bauer, C. ;

Bauer, Th ;

Bay, A. ;

Bediaga, I. ;

Belogurov, S. ;

Belous, K. ;

Belyaev, I. ;

Ben-Haim, E. ;

Benayoun, M. ;

Bencivenni, G. ;

Benson, S. ;

Benton, J. ;

Bernet, R. ;

Bettler, M-O. ;

van Beuzekom, M. ;

Bien, A. .

PHYSICS LETTERS B, 2012, 708 (3-5) :241-248

[5]

AAIJ R, 2013, JHEP, V1312

[6] Performance of the LHCb RICH detector at the LHC [J].

Adinolfi, M. ;

Rinella, G. Aglieri ;

Albrecht, E. ;

Bellunato, T. ;

Benson, S. ;

Blake, T. ;

Blanks, C. ;

Brisbane, S. ;

Brook, N. H. ;

Calvi, M. ;

Cameron, B. ;

Cardinale, R. ;

Carson, L. ;

Contu, A. ;

Coombes, M. ;

D'Ambrosio, C. ;

Easo, S. ;

Egede, U. ;

Eisenhardt, S. ;

Fanchini, E. ;

Fitzpatrick, C. ;

Fontanelli, F. ;

Forty, R. ;

Frei, C. ;

Gandini, P. ;

Gao, R. ;

Tico, J. Garra ;

Giachero, A. ;

Gibson, V. ;

Gotti, C. ;

Gregson, S. ;

Gys, T. ;

Haines, S. C. ;

Hampson, T. ;

Harnew, N. ;

Hill, D. ;

Hunt, P. ;

John, M. ;

Jones, C. R. ;

Johnson, D. ;

Kanaya, N. ;

Katvars, S. ;

Kerzel, U. ;

Kim, Y. M. ;

Koblitz, S. ;

Kucharczyk, M. ;

Lambert, D. ;

Main, A. ;

Maino, M. ;

Malde, S. .

EUROPEAN PHYSICAL JOURNAL C, 2013, 73 (05) :1-17

[7] Low-lying baryon masses using Nf=2 twisted mass clover-improved fermions directly at the physical pion mass [J].

Alexandrou, C. ;

Kallidonis, C. .

PHYSICAL REVIEW D, 2017, 96 (03)

[8] Doubly heavy spin-1/2 baryon spectrum in QCD [J].

Aliev, T. M. ;

Azizi, K. ;

Savci, M. .

NUCLEAR PHYSICS A, 2012, 895 :59-70

[9] The LHCb Detector at the LHC [J].

Alves, A. Augusto, Jr. ;

Andrade Filho, L. M. ;

Barbosa, A. F. ;

Bediaga, I. ;

Cernicchiaro, G. ;

Guerrer, G. ;

Lima, H. P., Jr. ;

Machado, A. A. ;

Magnin, J. ;

Marujo, F. ;

de Miranda, J. M. ;

Reis, A. ;

Santos, A. ;

Toledo, A. ;

Akiba, K. ;

Amato, S. ;

de Paula, B. ;

de Paula, L. ;

da Silva, T. ;

Gandelman, M. ;

Lopes, J. H. ;

Marechal, B. ;

Moraes, D. ;

Polycarpo, E. ;

Rodrigues, F. ;

Ballansat, J. ;

Bastian, Y. ;

Boget, D. ;

De Bonis, I. ;

Coco, V. ;

David, P. Y. ;

Decamp, D. ;

Delebecque, P. ;

Drancourt, C. ;

Dumont-Dayot, N. ;

Girard, C. ;

Lieunard, B. ;

Minard, M. N. ;

Pietrzyk, B. ;

Rambure, T. ;

Rospabe, G. ;

T'Jampens, S. ;

Ajaltouni, Z. ;

Bohner, G. ;

Bonnefoy, R. ;

Borras, D. ;

Carloganu, C. ;

Chanal, H. ;

Conte, E. ;

Cornat, R. .

JOURNAL OF INSTRUMENTATION, 2008, 3

[10]

Ani- keev K., 2001, WORKSH B PHYS TEV RU

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