Beam test performance of a prototype module with Short Strip ASICs for the CMS HL-LHC tracker upgrade

The Short Strip ASIC (SSA) is one of the four front-end chips designed for the upgrade of the CMS Outer Tracker for the High Luminosity LHC. Together with the Macro-Pixel ASIC (MPA) it will instrument modules containing a strip and a macro-pixel sensor stacked on top of each other. The SSA provides both full readout of the strip hit information when triggered, and, together with the MPA, correlated clusters called stubs from the two sensors for use by the CMS Level-1 (L1) trigger system. Results from the first prototype module consisting of a sensor and two SSA chips are presented. The prototype module has been characterized at the Fermilab Test Beam Facility using a 120 GeV proton beam

Search for Higgs decaying to bb at CMS

Searches for the standard model Higgs boson decaying into b quarks and produced in association with either vector bosons or top quark pairs are performed in proton-proton collisions with the CMS detector at the LHC. A search for neutral Higgs bosons decaying into b quarks and produced in association with at least one additional b quark is also performed. This mode is expected to be particularly sensitive to Higgs bosons in MSSM scenarios with large values of the parameter tan beta

Search for b-associated Standard Model Higgs boson production

One of the main goals of the LHC experiment is the precise measurement of the Higgs boson production mechanisms to clarify its coupling structure. In the Standard Model of particle physics, the coupling of the Higgs boson to fermions is introduced via the Yukawa interaction. Up to now the Yukawa coupling to b-quarks ($y_{b}$) was measured only in the decay process, and not yet in the production mechanism due to the low cross-section and the overwhelming background processes.This measurement aims at measuring the b-associated Higgs production (bbH) using data collected by the CMS experiment during Run 2. The study covers events where the Higgs boson is produced through the bbH channel and further decays into two tau leptons, subsequently fully leptonically ($\tau_{e}\tau_{\mu}$) or fully hadronically ($\tau_{h}\tau_{h}$). A machine learning approach has been used to classify the events into two Higgs signal classes and several background classes. First results on the sensitivity on the bbH production channel will be shown

Search for additional MSSM/2HDM H→bb with Run 2 CMS data

Some Beyond Standard Model (BSM) theories, like the Minimal Supersymmetric extension of the Standard Model (MSSM) or the Two-Higgs Doublet Model (2HDM), predict the existence of additional Higgs bosons with an enhanced coupling to bottom quarks. This talk focuses on the search for new neutral Higgs bosons decaying into b-quarks and produced in association with at least one b-quark. The analyzed data were collected by the CMS experiment at a centre-of-mass energy of 13 TeV, with the latest data reprocessing. First limits on the MSSM H->bb process using these data are shown

Thermal qualification of TEDD dees using infrared measurements

The instantaneous luminosity at LHC will increase by 2.5-4 times during Run-4 and Run-5 (HL-LHC). This poses new challenges for the tracker, such as higher pileup and track multiplicity. A new silicon tracking system designed to cope with the increased luminosity will be installed during the Phase-2 upgrade of the CMS detector. The new tracker has five double-disks (TEDD) in each endcap and each double-disk comprises four half disks (dees). A dee consists of two carbon fiber facings with carbon foam blocks sandwiched in between. The pixel strip (PS) and 2-strip (2S) silicon modules are mounted onto the surface of the dees.The PS and 2S modules need to be cooled efficiently to avoid thermal runaway. The carbon fiber facings function as cooling surfaces for the PS modules. Cooling pipes are embedded in the carbon foam blocks (which provide thermal contact between the facings and the pipes) to cool the dee facing. The 2S modules are cooled via aluminium inserts which connect the module to the cooling pipes. These inserts are embedded in the dee and protrude the facing.The integrity of the carbon foam blocks and the proper gluing of the carbon foam blocks and the 2S inserts with the carbon fiber facings play a crucial role in cooling the modules. Hence this needs to be validated during the reception test of the dees. A novel testing procedure using infrared imaging has been developed for this purpose and its capability has been demonstrated by thoroughly testing on prototype dees. The details of this procedure and measurement results of the prototype dees will be discussed in this poster

Search for heavy neutral Higgs bosons decaying into a pair of b quarks

With the discovery of the Higgs boson in 2012, a milestone in particle physics was reached. The precision measurements that followed indicate that the found particle agrees with the Standard Model predictions. Nevertheless, there is still room for theories beyond the Standard Model including an extended Higgs sector. Examples for such theories are Supersymmetry or general Two Higgs Doublet models. Not only feature these models additional Higgs bosons but they also allow for a significantly enhanced coupling of the Higgs boson to b quarks.This analysis targets heavy neutral Higgs bosons decaying into two b quarks and produced in association with one or two additional b quarks. The final state is thus fully hadronic. A mass range from 300 GeV to 1.6 TeV is investigated based on data collected in 2017 with the CMS detector at the LHC at a center-of-mass energy of 13 TeV. First results are shown

Beam test performance of a prototype module with Short Strip ASICs for the CMS HL-LHC tracker upgrade

The Short Strip ASIC (SSA) is one of the four front-end chips designed for the upgrade of the CMS Outer Tracker for the High Luminosity LHC. Together with the Macro-Pixel ASIC (MPA) it will instrument modules containing a strip and a macro-pixel sensor stacked on top of each other. The SSA provides both full readout of the strip hit information when triggered, and, together with the MPA, correlated clusters called stubs from the two sensors for use by the CMS Level-1 (L1) trigger system. Results from the first prototype module consisting of a sensor and two SSA chips are presented. The prototype module has been characterized at the Fermilab Test Beam Facility using a 120 GeV proton beam