Searches for physics beyond the standard model with the MT2 variable in hadronic final states with and without disappearing tracks in proton-proton collisions at [Formula: see text]

在质子-质子碰撞中，利用 MT2 变量在有/无消失径迹的强子末态中寻找超出标准模型的物理现象 [公式：见正文]

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作者：Sirunyan,A M,Tumasyan,A,Adam,W,Ambrogi,F,Bergauer,T,Brandstetter,J,Dragicevic,M,Erö,J,Del Valle,A Escalante,Flechl,M,Frühwirth,R,Jeitler,M,Krammer,N,Krätschmer,I,Liko,D,Madlener,T,Mikulec,I,Rad,N,Schieck,J,Schöfbeck,R,Spanring,M,Spitzbart,D,Waltenberger,W,Wulz,C-E,Zarucki,M,Drugakov,V,Mossolov,V,Gonzalez,J Suarez,Darwish,M R,De Wolf,E A,Di Croce,D,Janssen,X,Lelek,A,Pieters,M,Sfar,H Rejeb,Van Haevermaet,H,Van Mechelen,P,Van Putte,S,Van Remortel,N,Blekman,F,Bols,E S,Chhibra,S S,D'Hondt,J,De Clercq,J,Lontkovskyi,D,Lowette,S,Marchesini,I,Moortgat,S,Python,Q,Skovpen,K,Tavernier,S,Van Doninck,W,Van Mulders,P,Beghin,D,Bilin,B,Brun,H,Clerbaux,B,De Lentdecker,G,Delannoy,H,Dorney,B,Favart,L,Grebenyuk,A,Kalsi,A K,Popov,A,Postiau,N,Starling,E,Thomas,L,Velde,C Vander,Vanlaer,P,Vannerom,D,Cornelis,T,Dobur,D,Khvastunov,I,Niedziela,M,Roskas,C,Trocino,D,Tytgat,M,Verbeke,W,Vermassen,B,Vit,M,Bondu,O,Bruno,G,Caputo,C,David,P,Delaere,C,Delcourt,M,Giammanco,A,Lemaitre,V,Prisciandaro,J,Saggio,A,Marono,M Vidal,Vischia,P,Zobec,J,Alves,F L,Alves,G A,Silva,G Correia,Hensel,C,Moraes,A,Teles,P Rebello,Chagas,E Belchior Batista Das,Carvalho,W,Chinellato,J,Coelho,E,Da Costa,E M,Da Silveira,G G,De Jesus Damiao,D,De Oliveira Martins,C,De Souza,S Fonseca,Guativa,L M Huertas,Malbouisson,H,Martins,J,Figueiredo,D Matos,Jaime,M Medina,De Almeida,M Melo,Herrera,C Mora,Mundim,L,Nogima,H,Da Silva,W L Prado,Rosas,L J Sanchez,Santoro,A,Sznajder,A,Thiel,M,Manganote,E J Tonelli,De Araujo,F Torres Da Silva,Pereira,A Vilela,Bernardes,C A,Calligaris,L,Tomei,T R Fernandez Perez,Gregores,E M,Lemos,D S,Mercadante,P G,Novaes,S F,Padula,SandraS,Aleksandrov,A,Antchev,G,Hadjiiska,R,Iaydjiev,P,Misheva,M,Rodozov,M,Shopova,M,Sultanov,G,Bonchev,M,Dimitrov,A,Ivanov,T,Litov,L,Pavlov,B,Petkov,P,Fang,W,Gao,X,Yuan,L,Chen,G M,Chen,H S,Chen,M,Jiang,C H,Leggat,D,Liao,H,Liu,Z,Spiezia,A,Tao,J,Yazgan,E,Zhang,H,Zhang,S,Zhao,J,Agapitos,A,Ban,Y,Chen,G,Levin,A,Li,J,Li,L,Li,Q,Mao,Y,Qian,S 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Monchenault,G Hamel,Jarry,P,Leloup,C,Locci,E,Malcles,J,Rander,J,Rosowsky,A,Sahin,M Ö,Savoy-Navarro,A,Titov,M,Ahuja,S,Amendola,C,Beaudette,F,Busson,P,Charlot,C,Diab,B,Falmagne,G,de Cassagnac,R Granier,Kucher,I,Lobanov,A,Perez,C Martin,Nguyen,M,Ochando,C,Paganini,P,Rembser,J,Salerno,R,Sauvan,J B,Sirois,Y,Zabi,A,Zghiche,A,Agram,J-L,Andrea,J,Bloch,D,Bourgatte,G,Brom,J-M,Chabert,E C,Collard,C,Conte,E,Fontaine,J-C,Gelé,D,Goerlach,U,Jansová,M,Bihan,A-C Le,Tonon,N,Van Hove,P,Gadrat,S,Beauceron,S,Bernet,C,Boudoul,G,Camen,C,Carle,A,Chanon,N,Chierici,R,Contardo,D,Depasse,P,Mamouni,H El,Fay,J,Gascon,S,Gouzevitch,M,Ille,B,Jain,Sa,Lagarde,F,Laktineh,I B,Lattaud,H,Lesauvage,A,Lethuillier,M,Mirabito,L,Perries,S,Sordini,V,Torterotot,L,Touquet,G,Donckt,M Vander,Viret,S,Khvedelidze,A,Tsamalaidze,Z,Autermann,C,Feld,L,Kiesel,M K,Klein,K,Lipinski,M,Meuser,D,Pauls,A,Preuten,M,Rauch,M 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期刊：European Physical Journal C影响因子：4.800
时间：2020起止号：2020;80(1):3
doi：10.1140/epjc/s10052-019-7493-x

Abstract

Two related searches for phenomena beyond the standard model (BSM) are performed using events with hadronic jets and significant transverse momentum imbalance. The results are based on a sample of proton-proton collisions at a center-of-mass energy of 13 Te , collected by the CMS experiment at the LHC in 2016-2018 and corresponding to an integrated luminosity of 137 fb-1 . The first search is inclusive, based on signal regions defined by the hadronic energy in the event, the jet multiplicity, the number of jets identified as originating from bottom quarks, and the value of the kinematic variable MT2 for events with at least two jets. For events with exactly one jet, the transverse momentum of the jet is used instead. The second search looks in addition for disappearing tracks produced by BSM long-lived charged particles that decay within the volume of the tracking detector. No excess event yield is observed above the predicted standard model background. This is used to constrain a range of BSM models that predict the following: the pair production of gluinos and squarks in the context of supersymmetry models conserving R-parity, with or without intermediate long-lived charginos produced in the decay chain; the resonant production of a colored scalar state decaying to a massive Dirac fermion and a quark; or the pair production of scalar and vector leptoquarks each decaying to a neutrino and a top, bottom, or light-flavor quark. In most of the cases, the results obtained are the most stringent constraints to date.

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