Search for long-lived neutral particles decaying to quark-antiquark pairs in proton-proton collisions at √s=8 TeV

被引：97

作者：

Khachatryan, V. ^{[1
]}

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

Tumasyan, A. ^{[1
]}

Adam, W. ^{[2
]}

Bergauer, T. ^{[2
]}

Dragicevic, M. ^{[2
]}

Eroe, J. ^{[2
]}

Fabjan, C. ^{[2
,188
]}

Friedl, M. ^{[2
]}

Fruhwirth, R. ^{[2
,188
]}

Ghete, V. M. ^{[2
]}

Hartl, C. ^{[2
]}

Hormann, N. ^{[2
]}

Hrubec, J. ^{[2
]}

Jeitler, M. ^{[2
,188
]}

Kiesenhofer, W. ^{[2
]}

Knunz, V. ^{[2
]}

Krammer, M. ^{[2
,188
]}

Kratschmer, I. ^{[2
]}

Liko, D. ^{[2
]}

Mikulec, I. ^{[2
]}

Rabady, D. ^{[2
]}

Rahbaran, B. ^{[2
]}

Rohringer, H. ^{[2
]}

Schofbeck, R. ^{[2
]}

Strauss, J. ^{[2
]}

Taurok, A. ^{[2
]}

Treberer-Treberspurg, W. ^{[2
]}

Waltenberger, W. ^{[2
]}

Wulz, C. -E. ^{[2
,188
]}

Mossolov, V. ^{[3
]}

Shumeiko, N. ^{[3
]}

Suarez Gonzalez, J. ^{[3
]}

Alderweireldt, S. ^{[4
]}

Bansal, M. ^{[4
]}

Bansal, S. ^{[4
]}

Cornelis, T. ^{[4
]}

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

Janssen, X. ^{[4
]}

Knutsson, A. ^{[4
]}

Luyckx, S. ^{[4
]}

Ochesanu, S. ^{[4
,41
]}

Rougny, B. Roland R. ^{[4
]}

Van De Klundert, M. ^{[4
]}

Van Haevermaet, H. ^{[4
]}

Van Mechelen, P. ^{[4
]}

Van Remortel, N. ^{[4
]}

Van Spilbeeck, A. ^{[4
]}

Blekman, F. ^{[5
]}

Blyweert, S. ^{[5
]}

机构：

[1] Yerevan Phys Inst, Yerevan 375036, Armenia

[2] Inst Hochenergiephys OeAW, Vienna, Austria

[3] Natl Ctr Particle & High Energy Phys, Minsk, BELARUS

[4] Univ Antwerp, B-2020 Antwerp, Belgium

[5] Vrije Univ Brussel, Brussels, Belgium

[6] Univ Libre Bruxelles, Brussels, Belgium

[7] Univ Ghent, B-9000 Ghent, Belgium

[8] Catholic Univ Louvain, Louvain, Belgium

[9] Univ Mons, B-7000 Mons, Belgium

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

[11] Univ Estado Rio de Janeiro, BR-20550011 Rio De Janeiro, Brazil

[12] Univ Estadual Paulista, Sao Paulo, Brazil

[13] Univ Fed ABC, Sao Paulo, Brazil

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

[15] Univ Sofia, BU-1126 Sofia, Bulgaria

[16] Inst High Energy Phys, Beijing 100039, Peoples R China

[17] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[18] Univ Los Andes, Bogota, Colombia

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

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

[21] Rudjer Boskovic Inst, Zagreb, Croatia

[22] Univ Cyprus, CY-1678 Nicosia, Cyprus

[23] Charles Univ Prague, Prague, Czech Republic

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

[25] NICPB, Tallinn, Estonia

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

[27] Helsinki Inst Phys, Helsinki, Finland

[28] Lappeenranta Univ Technol, Lappeenranta, Finland

[29] CEA Saclay, DSM IRFU, F-91191 Gif Sur Yvette, France

[30] Ecole Polytech, IN2P3 CNRS, Lab Leprince Ringuet, Palaiseau, France

[31] Univ Haute Alsace Mulhouse, Univ Strasbourg, CNRS IN2P3, Inst Pluridisciplinaire Hubert Curien, Strasbourg, France

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

[33] Univ Lyon 1, CNRS IN2P3, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France

[34] Tbilisi State Univ, Inst High Energy Phys & Informatizat, GE-380086 Tbilisi, Georgia

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

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

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

[38] Deutsch Elekt Synchrotron, Hamburg, Germany

[39] Univ Hamburg, Hamburg, Germany

[40] Univ Karlsruhe, Inst Expt Kernphys, Karlsruhe, Germany

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

[42] Univ Athens, Athens, Greece

[43] Univ Ioannina, GR-45110 Ioannina, Greece

[44] Wigner Res Ctr Phys, Budapest, Hungary

[45] Inst Nucl Res ATOMKI, Debrecen, Hungary

[46] Univ Debrecen, H-4012 Debrecen, Hungary

[47] Natl Inst Sci Educ & Res, Bhubaneswar, Orissa, India

[48] Panjab Univ, Chandigarh 160014, India

[49] Univ Delhi, Delhi 110007, India

[50] Saha Inst Nucl Phys, Kolkata, India

来源：

PHYSICAL REVIEW D | 2015年 / 91卷 / 01期

基金：

巴西圣保罗研究基金会; 美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.91.012007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search is performed for long-lived massive neutral particles decaying to quark-antiquark pairs. The experimental signature is a distinctive topology of a pair of jets, originating at a secondary vertex. Events were collected with the CMS detector at the CERN LHC in proton-proton collisions at a center-of-mass energy of 8 TeV. The data analyzed correspond to an integrated luminosity of 18.5 fb(-1). No significant excess is observed above standard model expectations. Upper limits at 95% confidence level are set on the production cross section of a heavy neutral scalar particle, H, in the mass range of 200 to 1000 GeV, decaying promptly into a pair of long-lived neutral X particles in the mass range of 50 to 350 GeV, each in turn decaying into a quark-antiquark pair. For X with mean proper decay lengths of 0.4 to 200 cm, the upper limits are typically 0.5-200 fb. The results are also interpreted in the context of an R-parity-violating supersymmetric model with long-lived neutralinos decaying into a quark-antiquark pair and a muon. For pair production of squarks that promptly decay to neutralinos with mean proper decay lengths of 2-40 cm, the upper limits on the cross section are typically 0.5-3 fb. The above limits are the most stringent on these channels to date.

引用

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