Study of excited Λb0 states decaying to Λb0π+π- in proton-proton collisions at √s=13TeV

被引：43

作者：

Sirunyan, A. M. ^{[1
]}

Tumasyan, A. ^{[1
]}

Adam, W. ^{[2
]}

Ambrogi, F. ^{[2
]}

Bergauer, T. ^{[2
]}

Dragicevic, M. ^{[2
]}

Eroe, J. ^{[2
]}

Del Valle, A. Escalante ^{[2
]}

Flechl, M. ^{[2
]}

Fruehwirth, R. ^{[2
,214
]}

Jeitler, M. ^{[2
,214
]}

Krammer, N. ^{[2
]}

Kraetschmer, I ^{[2
]}

Liko, D. ^{[2
]}

Madlener, T. ^{[2
]}

Mikulec, I ^{[2
]}

Rad, N. ^{[2
]}

Schieck, J. ^{[2
,214
]}

Schoefbeck, R. ^{[2
]}

Spanring, M. ^{[2
]}

Waltenberger, W. ^{[2
]}

Wulz, C-E ^{[2
,214
]}

Zarucki, M. ^{[2
]}

Drugakov, V ^{[3
]}

Mossolov, V ^{[3
]}

Gonzalez, J. Suarez ^{[3
]}

Darwish, M. R. ^{[4
]}

De Wolf, E. A. ^{[4
]}

Di Croce, D. ^{[4
]}

Janssen, X. ^{[4
]}

Kello, T. ^{[4
,6
]}

Lelek, A. ^{[4
]}

Pieters, M. ^{[4
]}

Sfar, H. Rejeb ^{[4
]}

Van Haevermaet, H. ^{[4
]}

Van Mechelen, P. ^{[4
]}

Van Putte, S. ^{[4
]}

Van Remortel, N. ^{[4
]}

Blekman, F. ^{[5
]}

Bols, E. S. ^{[5
]}

Chhibra, S. S. ^{[5
]}

D'Hondt, J. ^{[5
]}

De Clercq, J. ^{[5
]}

Lontkovskyi, D. ^{[5
]}

Lowette, S. ^{[5
]}

Marchesini, I ^{[5
]}

Moortgat, S. ^{[5
]}

Python, Q. ^{[5
]}

Tavernier, S. ^{[5
]}

Van Doninck, W. ^{[5
]}

机构：

[1] Yerevan Phys Inst, Yerevan, Armenia

[2] Inst Hochenergiephys, Vienna, Austria

[3] Inst Nucl Problems, Minsk, BELARUS

[4] Univ Antwerp, Antwerp, Belgium

[5] Vrije Univ Brussel, Brussels, Belgium

[6] Univ Libre Bruxelles, Brussels, Belgium

[7] Univ Ghent, Ghent, Belgium

[8] Catholic Univ Louvain, Louvain La Neuve, Belgium

[9] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil

[10] Univ Estado Rio de Janeiro, Rio De Janeiro, Brazil

[11] Univ Estadual Paulista, Sao Paulo, Brazil

[12] Univ Fed ABC, Sao Paulo, Brazil

[13] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria

[14] Univ Sofia, Sofia, Bulgaria

[15] Beihang Univ, Beijing, Peoples R China

[16] Tsinghua Univ, Dept Phys, Beijing, Peoples R China

[17] Inst High Energy Phys, Beijing, Peoples R China

[18] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing, Peoples R China

[19] Zhejiang Univ, Hangzhou, Peoples R China

[20] Univ Los Andes, Bogota, Colombia

[21] Univ Antioquia, Medellin, Colombia

[22] Univ Split, Fac Elect Engn Mech Engn & Naval Architecture, Split, Croatia

[23] Univ Split, Fac Sci, Split, Croatia

[24] Inst Rudjer Boskovic, Zagreb, Croatia

[25] Univ Cyprus, Nicosia, Cyprus

[26] Charles Univ Prague, Prague, Czech Republic

[27] Escuela Politec Nacl, Quito, Ecuador

[28] Univ San Francisco Quito, Quito, Ecuador

[29] Acad Sci Res & Technol Arab Republ Egypt, Egyptian Network High Energy Phys, Cairo, Egypt

[30] NICPB, Tallinn, Estonia

[31] Univ Helsinki, Dept Phys, Helsinki, Finland

[32] Helsinki Inst Phys, Helsinki, Finland

[33] Lappeenranta Univ Technol, Lappeenranta, Finland

[34] Univ Paris Saclay, CEA, IRFU, Gif Sur Yvette, France

[35] Inst Polytech Paris, Lab Leprince Ringuet, Ecole Polytech, IN2P3,CNRS, Paris, France

[36] Univ Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France

[37] Inst Natl Phys Nucl & Phys Particules, Ctr Calcul, IN2P3, CNRS, Villeurbanne, France

[38] Univ Lyon, Inst Phys Nucl Lyon, Univ Claude Bernard Lyon 1, CNRS,IN2P3, Villeurbanne, France

[39] Georgian Tech Univ, Tbilisi, Georgia

[40] Tbilisi State Univ, Tbilisi, Georgia

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

[42] Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany

[43] Rhein Westfal TH Aachen, Phys Inst B 3, Aachen, Germany

[44] DESY, Hamburg, Germany

[45] Univ Hamburg, Hamburg, Germany

[46] Karlsruher Inst Technol, Karlsruhe, Germany

[47] NCSR Demokritos, INPP, Aghia Paraskevi, Greece

[48] Natl & Kapodistrian Univ Athens, Athens, Greece

[49] Natl Tech Univ Athens, Athens, Greece

[50] Univ Ioannina, Ioannina, Greece

来源：

PHYSICS LETTERS B | 2020年 / 803卷

基金：

芬兰科学院; 巴西圣保罗研究基金会; 欧盟地平线“2020”; 欧洲研究理事会; 英国科学技术设施理事会;

关键词：

CMS; Physics; Beauty baryon; Heavy baryon; Heavy flavor; Flavor spectroscopy; Experimental results; QED RADIATIVE-CORRECTIONS; UNIVERSAL MONTE-CARLO; HEAVY BARYONS; QUARK-MODEL; PHOTOS;

D O I：

10.1016/j.physletb.2020.135345

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A study of excited Lambda(0)(b) baryons is reported, based on a data sample collected in 2016-2018 with the CMS detector at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of up to 140fb(-1). The existence of four excited Lambda(0)(b) states: Lambda(0)(b) (5912)(0), Lambda(0)(b) (5920)(0), Lambda(0)(b) (6146)(0), and Lambda(0)(b) (6152)(0) in the Lambda(0)(b)pi(+)pi(-) mass spectrum is confirmed, and their masses are measured. The Lambda(0)(b)pi(+)pi(-) mass distribution exhibits a broad excess of events in the region of 6040-6100 MeV, whose origin cannot be discerned with the present data. (C) 2020 The Author(s). Published by Elsevier B.V.

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