Search for strongly interacting massive particles generating trackless jets in proton-proton collisions at s = 13 TeV

A search for dark matter in the form of strongly interacting massive particles (SIMPs) using the CMS detector at the LHC is presented. The SIMPs would be produced in pairs that manifest themselves as pairs of jets without tracks. The energy fraction of jets carried by charged particles is used as a key discriminator to suppress efficiently the large multijet background, and the remaining background is estimated directly from data. The search is performed using proton-proton collision data corresponding to an integrated luminosity of 16.1 fb - 1 , collected with the CMS detector in 2016. No significant excess of events is observed above the expected background. For the simplified dark matter model under consideration, SIMPs with masses up to 100 GeV are excluded and further sensitivity is explored towards higher masses

The Repetitive Content in Lupin Genomes

International audienceIn this chapter, we present the first detailed evaluation of the repetitive compartment in Lupinus genomes. Low-depth next-generation sequencing (NGS) genomic resources from four closely related smooth-seeded Mediterranean lupin species (L. albus, L. angustifolius, L. luteus, and L. micranthus), exhibiting remarkable differences in genome size and chromosome number have been investigated. The repetitive compartment is composed of a wide diversity of repeats and represents 23¿51% of the genomes. This compartment is essentially comprised of transposable elements (43¿85%), mainly represented by copia and gypsy LTR retrotransposon families. Among the latter, some prominent families (Tekay, Athila, Maximus-SIRE) significantly contribute to genome size differences among species and in shaping different species-specific repeat profiles, regardless of their chromosome numbers. Also particular lineages of these elements have been differentially and recently amplified within species, such as in L. luteus, L. albus, and L. angustifolius. Moreover, this study highlighted the diversity of tandem repeats in lupin genomes,with minisatellites and satellites mostly being species-specific, whereas microsatellites (SSRs) are ubiquitously distributed. Strikingly, L. angustifolius exhibited a tremendous amount of tandem repeats in its genome (26%), including a noteworthy accumulation of one particular hexamer SSR (15.24%of the genome),which demonstrate that also tandem repeatsmay greatly contribute to genomeobesity and dynamics in lupins. Therefore, differential lineage-specific amplifications of retrotransposons and tandem repeats occurred among lupins. Accordingly, this strongly suggests that different processes and mechanisms regulating amplification, proliferation, and clearance of repeats have differentially operated within the same genusamong closely relatedMediterranean species over the last *10¿12 Myr. Further extension of such evaluation to various representatives of the lupins diversity and outgroups will provide a better overview of the repetitive compartment and its evolutionary dynamics in the genus. Additionally, the genomic resources generated by this work represent a valuable basis to start building a repeats database specifically dedicated to best understand the genomic landscape, repeats distribution, and localization in lupins. This will facilitate further investigations on the functional and evolutionary impact of repeats on genes of interest, such as those responsive for important agronomical, adaptive, and defense features

First Search for Exclusive Diphoton Production at High Mass with Tagged Protons in Proton-Proton Collisions at √ s = 13 TeV

A search for exclusive two-photon production via photon exchange in proton-proton collisions, pp→pγγp with intact protons, is presented. The data correspond to an integrated luminosity of 9.4fb−1 collected in 2016 using the CMS and TOTEM detectors at a center-of-mass energy of 13 TeV at the LHC. Events are selected with a diphoton invariant mass above 350 GeV and with both protons intact in the final state, to reduce backgrounds from strong interactions. The events of interest are those where the invariant mass and rapidity calculated from the momentum losses of the forward-moving protons match the mass and rapidity of the central, two-photon system. No events are found that satisfy this condition. Interpreting this result in an effective dimension-8 extension of the standard model, the first limits are set on the two anomalous four-photon coupling parameters. If the other parameter is constrained to its standard model value, the limits at 95% confidence level are |ζ1|<2.9×10−13  GeV−4 and |ζ2|<6.0×10−13  GeV−4

First search for exclusive diphoton production at high mass with tagged protons in proton-proton collisions at sqrt[s]=13 TeV

A search for exclusive two-photon production via photon exchange in proton-proton collisions, pp→pγγp with intact protons, is presented. The data correspond to an integrated luminosity of 9.4  fb^{-1} collected in 2016 using the CMS and TOTEM detectors at a center-of-mass energy of 13 TeV at the LHC. Events are selected with a diphoton invariant mass above 350 GeV and with both protons intact in the final state, to reduce backgrounds from strong interactions. The events of interest are those where the invariant mass and rapidity calculated from the momentum losses of the forward-moving protons match the mass and rapidity of the central, two-photon system. No events are found that satisfy this condition. Interpreting this result in an effective dimension-8 extension of the standard model, the first limits are set on the two anomalous four-photon coupling parameters. If the other parameter is constrained to its standard model value, the limits at 95% confidence level are |ζ_{1}|<2.9×10^{-13}  GeV^{-4} and |ζ_{2}|<6.0×10^{-13}  GeV^{-4}