Search for new physics with the MT2 variable in all-jets final states produced in pp collisions at √s = 13 TeV

Artículo escrito por muchos autores, sólo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración y los autores que firman como pertenecientes a la UAMJournal of High Energy Physics 2016.10 (2016): 6 reproduced by permission of Scuola Internazionale Superiore di Studi Avanzati (SISSA)A search for new physics is performed using events that contain one or more
jets, no isolated leptons, and a large transverse momentum imbalance, as measured through
the MT2 variable, which is an extension of the transverse mass in events with two invisible
particles. The results are based on a sample of proton-proton collisions collected at a
center-of-mass energy of 13 TeV with the CMS detector at the LHC, and that corresponds
to an integrated luminosity of 2.3 fb−1
. The observed event yields in the data are consistent
with predictions for the standard model backgrounds. The results are interpreted using
simplified models of supersymmetry and are expressed in terms of limits on the masses
of potential new colored particles. Assuming that the lightest neutralino is stable and
has a mass less than about 500 GeV, gluino masses up to 1550–1750 GeV are excluded at
95% confidence level, depending on the gluino decay mechanism. For the scenario of direct
production of squark-antisquark pairs, top squarks with masses up to 800 GeV are excluded,
assuming a 100% branching fraction for the decay to a top quark and neutralino. Similarly,
bottom squark masses are excluded up to 880 GeV, and masses of light-flavor squarks are
excluded up to 600–1260 GeV, depending on the degree of degeneracy of the squark massesFinally, we acknowledge the enduring support for the construction and
operation of the LHC and the CMS detector provided by the following funding agencies:
BMWFW and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ,
and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS
(Colombia); MSES and CSF (Croatia); RPF (Cyprus); MoER, ERC IUT and
ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3
(France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NIH (Hungary);
DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic
of Korea); LAS (Lithuania); MOE and UM (Malaysia); CINVESTAV, CONACYT,
SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and
NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS and RFBR (Russia);
MESTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland);
MST (Taipei); ThEPCenter, IPST, STAR and NSTDA (Thailand); TUBITAK and TAEK
(Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (U.S.A.).
Individuals have received support from the Marie-Curie program and the European Research
Council and EPLANET (European Union); the Leventis Foundation; the A. P. Sloan
Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy
Office; the Fonds pour la Formation `a la Recherche dans l’Industrie et dans l’Agriculture
(FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWTBelgium);
the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic;
the Council of Science and Industrial Research, India; the HOMING PLUS program of the
Foundation for Polish Science, cofinanced from European Union, Regional Development
Fund; the OPUS program of the National Science Center (Poland); the Compagnia di San
Paolo (Torino); MIUR project 20108T4XTM (Italy); the Thalis and Aristeia programs
cofinanced by EU-ESF and the Greek NSRF; the National Priorities Research Program by
Qatar National Research Fund; the Rachadapisek Sompot Fund for Postdoctoral Fellowship,
Chulalongkorn University (Thailand); the Chulalongkorn Academic into Its 2nd Century
Project Advancement Project (Thailand); and the Welch Foundation, contract C-184