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Results for “Hadronization”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 1,567 records · Page 87
All sourcesNASA NTRSDOE OSTI
DOE OSTI2015

Study of D * * production and light hadronic states in the B ¯ 0 → D * + ω π – decay

We report on the first observations of B¯ 0 → D 1 (2430) 0 ω, B¯ 0 → D 1 (2420) 0 ω and B¯ 0 → D* 2 (2460) 0 ω decays. The B¯ 0 → D* + ρ(1450) – decay is also observed. The branching fraction measurements are based on (771.6 ± 10.6) × 10 6 BB¯ events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e + e – collider. The fractions of longitudinal polarization of the D** states as well as partial wave fractions of the D 1 (2430) 0 are obtained. We also set a 90% confidence level upper limit for the product of branching fractions of B(B¯ 0 → D* + b 1 (1235) – ) × B(b 1 (1235) – → ωπ – ). In conclusion, the measurements show evidence of nontrivial final-state interaction phases for the ρ-like amplitudes.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2015

Vectorlike Leptons at the Large Hadron Collider

We study the prospects for excluding or discovering vectorlike leptons using multilepton events at the LHC. We consider models in which the vectorlike leptons decay to tau leptons. If the vectorlike leptons are weak isosinglets, then discovery in multilepton states is found to be extremely challenging. For the case that the vectorlike leptons are weak isodoublet, we argue that there may be an opportunity for exclusion for masses up to about 275 GeV by direct searches with existing LHC data at sqrt{s}=8 TeV. We also discuss prospects for exclusion or discovery at the LHC with future sqrt{s}=13 TeV data.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2017

Tracking down quirks at the Large Hadron Collider

Non-helical tracks are the smoking gun signature of charged and/or colored quirks, which are pairs of particles bound by a new, long-range confining force. We introduce an approach to efficiently search for these non-helical tracks at the LHC, without the need to fit their trajectories. We show that the hits corresponding to quirky trajectories can be selected efficiently by searching for co-planar hits in the inner layers of the ATLAS and CMS trackers, even in the presence of on average 50 pile-up vertices. We further argue that backgrounds from photon conversions and unassociated pile-up hits can be removed almost entirely, while maintaining a signal reconstruction efficiency as high as ~70%. With the 300 fb ₋1 dataset, this implies a discovery potential for string tension between 100 eV and 30 keV, and colored (electroweak charged) quirks as heavy as 1600 (650) GeV may be discovered.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗