منابع مشابه
Narrow-width approximation accuracy
A study of general properties of the narrow-width approximation (NWA) with polarization/spin decorrelation is presented. We prove for sufficiently inclusive differential rates of arbitrary resonant decay or scattering processes with an on-shell intermediate state decaying via a cubic or quartic vertex that decorrelation effects vanish and the NWA is of order Γ. Its accuracy is then determined n...
متن کاملNarrow-width approximation limitations
−∞ dqD(q). The scattering cross section σ thus approximately decouples into on-shell production (σp) and decay as shown in Eq. (1) for a scalar process [1]. The generalization to multiple resonances is straightforward. We use the notation of [2], Sec. 38. Based on the scales occurring in D(q), the conventional error estimate is O(Γ/M). The branching fraction for the considered decay mode is the...
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A modified narrow-width approximation that allows for O(Γ/M)-accurate predictions for resonant particle decay with similar intermediate masses is proposed and applied to MSSM processes to demonstrate its importance for searches for particle physics beyond the Standard Model.
متن کاملBreakdown of the narrow width approximation for new physics.
The narrow-width approximation is used in high-energy physics to reduce the complexity of scattering calculations. It is a fortunate accident that it works so well for the standard model, but in general it will fail in the context of new physics. We find numerous examples of significant corrections when the calculation is performed fully off shell including a finite width, notably from effects ...
متن کاملNarrow Width Dynamic Scheduling
To satisfy the demand for higher performance, modern processors are designed with a high degree of speculation. While speculation enhances performance, it burns power unnecessarily. The cache, store queue, and load queue are accessed associatively before a matching entry is determined. A significant amount of power is wasted to search entries that are not picked. Modern processors speculatively...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2009
ISSN: 0550-3213
DOI: 10.1016/j.nuclphysb.2009.01.022