Search for low mass vector resonances decaying to quark-antiquark pairs in proton-proton ...

Search for low mass vector resonances decaying to quark-antiquark pairs in proton-proton ...

30 Pages · 2017 · 513 KB · English

resonance is produced at large transverse momenta, with its decay products merged into a single jet. In this Letter, we report on a search for vector (Z ) resonances decaying to quark-antiquark pairs (qq) H. Malbouisson, M. Melo De Almeida, C. Mora Herrera, L. Mundim, H. Nogima, A. Santoro,.

Search for low mass vector resonances decaying to quark-antiquark pairs in proton-proton ... free download


EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH (CERN) CERNEP2017098 2017/09/20 CMSEXO16030 Search for low mass vector resonances decaying to quarkantiquark pairs in protonproton collisions at p s = 13 TeV The CMS Collaboration  Abstract A search is reported for a narrow vector resonance decaying to quarkantiquark pairs in protonproton collisions at p s = 13 TeV, collected with the CMS detector at the LHC The data sample corresponds to an integrated luminosity of 27 fb 1 The vector resonance is produced at large transverse momenta, with its decay products merged into a single jet The resulting signature is a peak over background in the distribution of the invariant mass of the jet The results are interpreted in the framework of a lepto phobic vector resonance and no evidence is found for such particles in the mass range of 100–300 GeV Upper limits at 95% condence level on the production cross section are presented in a region of masscoupling phase space previously unexplored at the LHC The region below 140 GeV has not been explored by any previous experiments Published in Physical Review Letters as doi:101103/PhysRevLett119111802 c 2017 CERN for the benet of the CMS Collaboration CCBY30 license  See Appendix A for the list of collaboration members 1 Over the past halfcentury, searches for narrow resonances in the dijet invariant mass spectrum have been an important part of the physics program at every collider Such searches are well motivated within the many classes of theories beyond the current standard model (SM) that predict resonances with signicant couplings to quarks [1–11] The rst searches for such par ticles at the UA1 [12] and UA2 [13, 14] experiments at the CERN S ppS have been extended to larger values of resonance masses by the CDF [15–19] and D0 [20–22] experiments at the Fer milab Tevatron, and by the ATLAS [23–32] and CMS [33–45] experiments at the CERN LHC In this Letter, we report on a search for vector (Z 0 ) resonances decaying to quarkantiquark pairs (q q) using the data collected in pp collisions at p s = 13 TeV by the CMS detector, corre sponding to an integrated luminosity of 27 fb 1 This search concentrates on the mass region of 100–300 GeV, exploring for the rst time masses below 140 GeV [13, 14] To access this mass regime, we present a new analysis technique exploiting novel jet substructure techniques and associated production with a jet The search is interpreted in the framework of a leptopho bic vector resonance and can also be reinterpreted in terms of searches for generic vectorlike resonances decaying to quarks [46] With the increase in collision energy and beam intensity at hadron colliders, there has been a loss of search sensitivity for lighter resonances with couplings to quarks and gluons The main experimental difculties originate from the large increase in the cross section of multijet back grounds at small resonance masses, and the more restrictive trigger requirements needed to reduce the data recording rate because of limited resources for event processing and storage To overcome these difculties, we require events to have a jet with large transverse momen tum ( p T) from initialstate radiation (ISR) produced in association with the resonance This ISR constraint provides enough energy in the event to satisfy the trigger Combinatorial back grounds are reduced by requiring the resonance be reconstructed within a single jet The jet is required to have the twoprong structure expected from signal The dominant background is from SM events comprised of jets produced through quantum chromodynamics (QCD) This multijet background is estimated by inverting the twoprong substructure requirement, which is specically designed to be uncorrelated with the jet mass By searching for new particles produced in association with an ISR jet, we are able to search for new resonances in a coupling and mass regime to which previous searches were insensitive A detailed description of the CMS detector, together with a denition of the coordinate

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