Search for long-lived particles produced in association with a Z boson in proton-proton collisions at √s=13 TeV

被引：0

作者：

Tumasyan, A. ^{[1
]}

Adam, W. ^{[2
]}

Andrejkovic, J. W. ^{[2
]}

Bergauer, T. ^{[2
]}

Chatterjee, S. ^{[2
]}

Dragicevic, M. ^{[2
]}

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

Fruhwirth, R. ^{[2
,217
]}

Jeitler, M. ^{[2
,217
]}

Krammer, N. ^{[2
]}

Lechner, L. ^{[2
]}

Liko, D. ^{[2
]}

Mikulec, I ^{[2
]}

Paulitsch, P. ^{[2
]}

Pitters, F. M. ^{[2
]}

Schieck, J. ^{[2
,217
]}

Schofbeck, R. ^{[2
]}

Schwarz, D. ^{[2
]}

Templ, S. ^{[2
]}

Waltenberger, W. ^{[2
]}

Wulz, C-E ^{[2
,217
]}

Chekhovsky, V ^{[3
]}

Litomin, A. ^{[3
]}

Makarenko, V ^{[3
]}

Darwish, M. R. ^{[4
,218
]}

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

Janssen, T. ^{[4
]}

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

Lelek, A. ^{[4
]}

Sfar, H. Rejeb ^{[4
]}

Van Mechelen, P. ^{[4
]}

Van Putte, S. ^{[4
]}

Van Remortel, N. ^{[4
]}

Blekman, F. ^{[5
]}

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

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

Delcourt, M. ^{[5
]}

El Faham, H. ^{[5
]}

Lowette, S. ^{[5
]}

Moortgat, S. ^{[5
]}

Morton, A. ^{[5
]}

Muller, D. ^{[5
]}

Sahasransu, A. R. ^{[5
]}

Tavernier, S. ^{[5
]}

Van Doninck, W. ^{[5
]}

Van Mulders, P. ^{[5
]}

Stylianou, N. ^{[5
,166
]}

Beghin, D. ^{[6
]}

Bilin, B. ^{[6
]}

Clerbaux, B. ^{[6
]}

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] Sun Yat Sen Univ, Guangzhou, Peoples R China

[20] Fudan Univ, Inst Modern Phys, Shanghai, Peoples R China

[21] Fudan Univ, Key Lab Nucl Phys & Ion Beam Applicat MOE, Shanghai, Peoples R China

[22] Zhejiang Univ, Hangzhou, Peoples R China

[23] Univ Los Andes, Bogota, Colombia

[24] Univ Antioquia, Medellin, Colombia

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

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

[27] Inst Rudjer Boskovic, Zagreb, Croatia

[28] Univ Cyprus, Nicosia, Cyprus

[29] Charles Univ Prague, Prague, Czech Republic

[30] Escuela Politec Nacl, Quito, Ecuador

[31] Univ San Francisco Quito, Quito, Ecuador

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

[33] Fayoum Univ, Ctr High Energy Phys CHEP FU, Al Fayyum, Egypt

[34] NICPB, Tallinn, Estonia

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

[36] Helsinki Inst Phys, Helsinki, Finland

[37] Lappeenranta Univ Technol, Lappeenranta, Finland

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

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

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

[41] Inst Phys 2 Infinis Lyon IP2I, Villeurbanne, France

[42] Georgian Tech Univ, Tbilisi, Georgia

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

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

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

[46] DESY, Hamburg, Germany

[47] Univ Hamburg, Hamburg, Germany

[48] Karlsruher Inst Technol, Karlsruhe, Germany

[49] NCSR Demokritos, Inst Nucl & Particle Phys INPP, Aghia Paraskevi, Greece

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

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2022年 / 03期

基金：

欧盟地平线“2020”; 巴西圣保罗研究基金会; 芬兰科学院; 俄罗斯基础研究基金会; 欧洲研究理事会;

关键词：

Beyond Standard Model; Hadron-Hadron Scattering; Lifetime;

D O I：

10.1007/JHEP03(2022)160

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：

A search for long-lived particles (LLPs) produced in association with a Z boson is presented. The study is performed using data from proton-proton collisions with a center-of-mass energy of 13 TeV recorded by the CMS experiment during 2016-2018, corresponding to an integrated luminosity of 117fb(-1).( )The LLPs are assumed to decay to a pair of standard model quarks that are identified as displaced jets within the CMS tracker system. Triggers and selections based on Z boson decays to electron or muon pairs improve the sensitivity to light LLPs (down to 15 GeV). This search provides sensitivity to beyond the standard model scenarios which predict LLPs produced in association with a Z boson. In particular, the results are interpreted in the context of exotic decays of the Higgs boson to a pair of scalar LLPs (H -> SS). The Higgs boson decay branching fraction is constrained to values less than 6% for proper decay lengths of 10-100 mm and for LLP masses between 40 and 55 GeV. In the case of low-mass (approximate to 15 GeV) scalar particles that subsequently decay to a pair of b quarks, the search is sensitive to branching fractions B(H -> SS) < 20% for proper decay lengths of 10-50 mm. The use of associated production with a Z boson increases the sensitivity to low-mass LLPs of this analysis with respect to gluon fusion searches. In the case of 15 GeV scalar LLPs, the improvement corresponds to a factor of 2 at a proper decay length of 30 mm.

引用

页数：37

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