Measurement of properties of Bs0s → μ+μ- decays and search for B0 → μ+μ- with the CMS experiment

被引：0

作者：

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

Tumasyan, A. ^{[1
]}

Adam, W. ^{[2
]}

Ambrogi, F. ^{[2
]}

Bergauer, T. ^{[2
]}

Brandstetter, J. ^{[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
]}

Spitzbart, D. ^{[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
]}

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
]}

Skovpen, K. ^{[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, CNRS,IN2P3, Paris, France

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

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

[38] Univ Lyon, Inst Phys Nucl Lyon, CNRS IN2P3, Univ Claude Bernard Lyon 1, 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, Inst Nucl & Particle Phys 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：

JOURNAL OF HIGH ENERGY PHYSICS | 2020年 / 04期

基金：

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

关键词：

B physics; Hadron-Hadron scattering (experiments); TOOL;

D O I：

10.1007/JHEP04(2020)188

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Results are reported for the B 0s ! + branching fraction and effective lifetime and from a search for the decay B0 ! + . The analysis uses a data sample of proton-proton collisions accumulated by the CMS experiment in 2011, 2012, and 2016, with center-of-mass energies (integrated luminosities) of 7TeV (5 fb), 8TeV (20 fb), and 13TeV (36 fb). The branching fractions are determined by measuring event yields relative to B+ ! J= K+ decays (with J= ! + ), which results in the reduction of many of the systematic uncertainties. The decay B 0s ! + is observed with a significance of 5.6 standard deviations. The branching fraction is measured to be B (B 0s ! + ) = [2:9 0:7(exp) 0:2(frag)] 10, where the first uncertainty combines the experimental statistical and systematic contributions, and the second is due to the uncertainty in the ratio of the B 0s and the B+ fragmentation functions. No significant excess is observed for the decay B0 ! + , and an upper limit of B(B0 ! + ) < 3:6 10 is obtained at 95% confidence level. The B 0s ! + effective lifetime is measured to be + = 1:70 +0:61 ps. These results are consistent with standard model predictions.

引用

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