Observation of a New Ξb- Resonance

被引：94

作者：

Aaij, R. ^{[27
]}

Adeva, B. ^{[41
]}

Adinolfi, M. ^{[48
]}

Aidala, C. A. ^{[61
,73
]}

Ajaltouni, Z. ^{[5
]}

Akar, S. ^{[59
]}

Albicocco, P. ^{[18
]}

Albrecht, J. ^{[10
]}

Alessio, F. ^{[42
]}

Alexander, M. ^{[53
]}

Albero, A. Alfonso ^{[40
]}

Ali, S. ^{[27
]}

Alkhazov, G. ^{[33
]}

Cartelle, P. Alvarez ^{[55
]}

Alves, A. A., Jr. ^{[59
]}

Amato, S. ^{[2
]}

Amerio, S. ^{[23
]}

Amhis, Y. ^{[7
]}

An, L. ^{[3
]}

Anderlini, L. ^{[17
]}

Andreassi, G. ^{[43
]}

Andreotti, M. ^{[16
,75
]}

Andrews, J. E. ^{[60
]}

Appleby, R. B. ^{[56
]}

Archilli, F. ^{[27
]}

d'Argent, P. ^{[12
]}

Romeu, J. Arnau ^{[6
]}

Artamonov, A. ^{[39
]}

Artuso, M. ^{[61
]}

Arzymatov, K. ^{[37
]}

Aslanides, E. ^{[6
]}

Atzeni, M. ^{[44
]}

Bachmann, S. ^{[12
]}

Back, J. J. ^{[50
]}

Baker, S. ^{[55
]}

Balagura, V. ^{[7
,8
,40
,41
,60
,76
]}

Baldini, W. ^{[16
]}

Baranov, A. ^{[37
]}

Barlow, R. J. ^{[56
]}

Barsuk, S. ^{[7
]}

Barter, W. ^{[56
]}

Baryshnikov, F. ^{[34
]}

Batozskaya, V. ^{[31
]}

Batsukh, B. ^{[61
]}

Battista, V. ^{[43
]}

Bay, A. ^{[43
]}

Beddow, J. ^{[53
]}

Bedeschi, F. ^{[24
]}

Bediaga, I. ^{[1
]}

Beiter, A. ^{[61
]}

机构：

[1] CBPF, Rio De Janeiro, Brazil

[2] Univ Fed Rio de Janeiro, Rio de Janeiro, Brazil

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

[4] Univ Savoie Mont Blanc, Univ Grenoble Alpes, CNRS, IN2P3,LAPP, Annecy, France

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

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

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

[8] Univ Paris Diderot, Univ Pierre & Marie Curie, CNRS, LPNHE,IN2P3, Paris, France

[9] Rhein Westfal TH Aachen, Phys Inst 1, Aachen, Germany

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

[11] MPIK, Heidelberg, Germany

[12] Heidelberg Univ, Phys Inst, Heidelberg, Germany

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

[14] INFN, Sez Bari, Bari, Italy

[15] INFN, Sez Bologna, Bologna, Italy

[16] INFN, Sez Ferrara, Ferrara, Italy

[17] INFN, Sez Firenze, Florence, Italy

[18] INFN, Lab Nazl Frascati, Frascati, Italy

[19] INFN, Sez Genova, Genoa, Italy

[20] INFN, Sez Milano Bicocca, Milan, Italy

[21] INFN, Sez Milano, Milan, Italy

[22] INFN, Sez Cagliari, Monserrato, Italy

[23] INFN, Sez Padova, Padua, Italy

[24] INFN, Sez Pisa, Pisa, Italy

[25] INFN, Sez Roma Tor Vergata, Rome, Italy

[26] INFN, Sez Roma Sapienza, Rome, Italy

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

[28] Vrije Univ Amsterdam, Amsterdam, Netherlands

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

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

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

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

[33] PNPI, Gatchina, Russia

[34] ITEP, Moscow, Russia

[35] MSU, Inst Nucl Phys, SINP, Moscow, Russia

[36] RAS, INR, Moscow, Russia

[37] Yandex Sch Data Anal, Moscow, Russia

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

[39] IHEP, Protvino, Russia

[40] Univ Barcelona, ICCUB, Barcelona, Spain

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

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

[43] Ecole Polytech Fed Lausanne, Inst Phys, Lausanne, Switzerland

[44] Univ Zurich, Phys Inst, Zurich, Switzerland

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

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

[47] Univ Birmingham, Birmingham, W Midlands, England

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

[49] Univ Cambridge, Cavendish Lab, Cambridge, England

[50] Univ Warwick, Dept Phys, Coventry, W Midlands, England

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 121卷 / 07期

关键词：

HEAVY BARYONS; MODEL; DECAY;

D O I：

10.1103/PhysRevLett.121.072002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

From samples of pp collision data collected by the LHCb experiment at root s = 7, 8 and 13 TeV, corresponding to integrated luminosities of 1.0, 2.0 and 1.5 fb(-1), respectively, a peak in both the Lambda(0)(b) K- and Xi(0)(b)pi(-) invariant mass spectra is observed. In the quark model, radially and orbitally excited Xi(-)(b) resonances with quark content bds are expected. Referring to this peak as Xi(b)(6227)(-), the mass and natural width are measured to be m(Xi b(6227))(-) = 6226.9 +/- 2.0 +/- 0.3 +/- 0.2 MeV/c(2) and Gamma(Xi b(6227))- = 18.1 +/- 5.4 +/- 1.8 MeV/c(2), where the first uncertainty is statistical, the second is systematic, and the third, on m(Xi b(6227))(-), is due to the knowledge of the Lambda(0)(b) baryon mass. Relative production rates of the Xi(b)(6227)(-) -> Lambda K-0(b)- and Xi(b)(6227)(-) -> Xi(0)(b)pi(-) decays are also reported.

引用

页数：12

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