Interpreting BEC in e + e - annihilation Metzger, W.J.; Csörgő, T.; Novák, T. ...
EPJ Web of Conferences,
2019, Volume:
206
Journal Article, Conference Proceeding
Peer reviewed
Open access
The usual interpretation of Bose-Einstein correlations (BEC) of identical boson pairs relates the width of the peak in the correlation function at small relative four-momentum to the spatial extent ...of the source of the bosons. However, in the τ-model, which successfully describes BEC in hadronic Z decay, the width of the peak is related to the temporal extent of boson emission. Some new checks on the validity of both the τ-model and the usual descriptions are presented.
Zusammenfassung
Sieben Jahre nach der Entdeckung des Higgs‐Bosons am LHC sind seine Eigenschaften weitestgehend gesichert. Es besitzt die Quantenzahlen des Vakuums und zeigt wie erwartet ein ...einzigartiges Kopplungsverhalten mit allen bekannten Teilchen des Standardmodells, deren Kopplung derzeit am LHC nachweisbar ist. Dieses Kopplungsverhalten konnte mit einer Messgenauigkeit von 10 bis 16 % nachgewiesen werden. Mit zunehmender Datenmenge wird diese Messgenauigkeit in den Bereich weniger Prozent vordringen. Zu den noch offenen Fragen zählen die Selbstwechselwirkung des Higgs‐Teilchens und die Suche nach weiteren Higgs‐Bosonen als Bestandteil einer Theorie jenseits des Standardmodells.
A search for heavy neutral Higgs bosons is performed using the LHC Run 2 data, corresponding to an integrated luminosity of 139 fb−1 of proton-proton collisions at √s = 13 TeV recorded with the ...ATLAS detector. The search for heavy resonances is performed over the mass range 0.2–2.5 TeV for the τ+ τ− decay with at least one τ -lepton decaying into final states with hadrons. The data are in good agreement with the background prediction of the standard model. In the Mh125 scenario of the minimal supersymmetric standard model, values of tan β > 8 and tan β > 21 are excluded at the 95% confidence level for neutral Higgs boson masses of 1.0 and 1.5 TeV, respectively, where tan β is the ratio of the vacuum expectation values of the two Higgs doublets.
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We present accurate QCD predictions for the transverse momentum ( Formula omitted) spectrum of electroweak gauge bosons at the LHC for Formula omitted collisions, based on a consistent combination of ...a NNLO calculation at large Formula omitted and N Formula omittedLL resummation in the small Formula omitted limit. The inclusion of higher order corrections leads to substantial changes in the shape of the differential distributions, and the residual perturbative uncertainties are reduced to the few percent level across the whole transverse momentum spectrum. We examine the ratio of Formula omitted distributions in charged- and neutral-current Drell-Yan production, and study different prescriptions for the estimate of perturbative uncertainties that rely on different degrees of correlation between these processes. We observe an excellent stability of the ratios with respect to the perturbative order, indicating a strong correlation between the corresponding QCD corrections.
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