Séminaires
Missing Et and b-jets: from single top observation to low mass Higgs searches
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Europe/Paris
Amphiteatre CPPM
Amphiteatre CPPM
Description
Neutrinos and quarks are the most challenging objects to identify at a hadron collider, such as the Tevatron or LHC. Infact, neutrinos interact very weakly and thus their presence is marked by an imbalance in the transverse energy flow in the detector, the missing transverse energy. Quarks emit gluons and then hadronize into a spray of particle called jet. Object reconstruction is further complicated by the extra energy appearing from multiple parton collisions in the beam. The identification of both objects is usually performed through calorimetry, and thus suffers from the device limited resolution. The most common source of missing Et and jets is infact QCD production of multijet events, where the missing Et appears due to jet energy measurement fluctuations. Still, the same signature is shared with a multitude of extremely interesting physics processes. As an example, I will present two Tevatron searches in the missing Et + jets signature that contribute significantly to two of the most important Tevatron physics goals: the observation of electroweak single top production and the approaching exclusion or evidence of the existence of the standard model Higgs boson.