A Discourse Inspired by Dark Matter
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Some collider signals of the invisible and the visible: adiscourseinspiredbydarkmatter Biswarup Mukhopadhyaya Regional Centre for Accelerator-based Particle Physics Harish-Chandra Research Institute Allahabad, India March, 2017 Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter The LHC... p p )( Ecm =7/8/13/14 TeV Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter Heavy particles decay into lighter ones The particles are ‘boosted’: ∆t =∆t / 1 v 2/c2 rest − The stable/long-lived products are intercepted by di↵erent componentsp of detectors Once collisions take place... Many particles (known/unknown) can be produced Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter The particles are ‘boosted’: ∆t =∆t / 1 v 2/c2 rest − The stable/long-lived products are intercepted by di↵erent componentsp of detectors Once collisions take place... Many particles (known/unknown) can be produced Heavy particles decay into lighter ones Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter The stable/long-lived products are intercepted by di↵erent components of detectors Once collisions take place... Many particles (known/unknown) can be produced Heavy particles decay into lighter ones The particles are ‘boosted’: ∆t =∆t / 1 v 2/c2 rest − p Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter Once collisions take place... Many particles (known/unknown) can be produced Heavy particles decay into lighter ones The particles are ‘boosted’: ∆t =∆t / 1 v 2/c2 rest − The stable/long-lived products are intercepted by di↵erent componentsp of detectors Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter The CMS detector ... Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter The ATLAS detector... Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter The dimension of a detector... Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter The sequence of various layers of a detector has a particular logic...... Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter Not detected in any part of the detector The only LHC signal of such particles: imbalance of transverse momentum of all visible particles ‘MET’ The standard model candidates for MET: the three neutrinos Any additional ‘invisible’ particles Events with MET even after ‘subtracting’ ) the e↵ect of neutrinos Such particles can contribute to the dark matter content of the universe Now think of...... Some particle(s) having neither strong not electromagnetic interaction Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter The only LHC signal of such particles: imbalance of transverse momentum of all visible particles ‘MET’ The standard model candidates for MET: the three neutrinos Any additional ‘invisible’ particles Events with MET even after ‘subtracting’ ) the e↵ect of neutrinos Such particles can contribute to the dark matter content of the universe Now think of...... Some particle(s) having neither strong not electromagnetic interaction Not detected in any part of the detector Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter The standard model candidates for MET: the three neutrinos Any additional ‘invisible’ particles Events with MET even after ‘subtracting’ ) the e↵ect of neutrinos Such particles can contribute to the dark matter content of the universe Now think of...... Some particle(s) having neither strong not electromagnetic interaction Not detected in any part of the detector The only LHC signal of such particles: imbalance of transverse momentum of all visible particles ‘MET’ Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter Any additional ‘invisible’ particles Events with MET even after ‘subtracting’ ) the e↵ect of neutrinos Such particles can contribute to the dark matter content of the universe Now think of...... Some particle(s) having neither strong not electromagnetic interaction Not detected in any part of the detector The only LHC signal of such particles: imbalance of transverse momentum of all visible particles ‘MET’ The standard model candidates for MET: the three neutrinos Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter Such particles can contribute to the dark matter content of the universe Now think of...... Some particle(s) having neither strong not electromagnetic interaction Not detected in any part of the detector The only LHC signal of such particles: imbalance of transverse momentum of all visible particles ‘MET’ The standard model candidates for MET: the three neutrinos Any additional ‘invisible’ particles Events with MET even after ‘subtracting’ ) the e↵ect of neutrinos Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter Now think of...... Some particle(s) having neither strong not electromagnetic interaction Not detected in any part of the detector The only LHC signal of such particles: imbalance of transverse momentum of all visible particles ‘MET’ The standard model candidates for MET: the three neutrinos Any additional ‘invisible’ particles Events with MET even after ‘subtracting’ ) the e↵ect of neutrinos Such particles can contribute to the dark matter content of the universe Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter If MET indicates new invisible particles, The total standard model (SM) contribution needs to estimated and subtracted One also needs to estimate ‘fake’ MET arising from, say, mismeasurement of jet energy, pile-up e↵ects etc. Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter Estimating the SM/residual MET in a ‘control region’..... Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter Then looking for new physics with large MET..... Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter CMBR anisotropy Observation of bullet clusters Observation of γ-ray signals, excess positrons, excess in galactic antiproton/proton ratio.... Outcomes of direct search experiments Missing energy in collider experiments (Attempt to reconstruct masses from mT 2, mcT , psˆmin,...) Dark matter is indicated/expected to show up in.... Galactic rotation curves Biswarup Mukhopadhyaya Regional Centre for Accelerator-based ParticleSome Physics collider Harish-Chandra signals of the invisible Research and Institute the visible: Allahabad, a discourse India inspired by dark matter Observation of bullet clusters Observation of γ-ray signals, excess positrons, excess in galactic antiproton/proton ratio.... Outcomes of direct search experiments Missing energy in collider experiments (Attempt to reconstruct masses from mT 2, mcT , psˆmin,...)