Angular distribution of polarised Λb baryons decaying to Λℓ+ℓ−
نویسندگان
چکیده
منابع مشابه
Photon polarization from helicity suppression in radiative decays of polarized Λb to spin-3/2 baryons
We give a general parameterization of the Λb → Λ(1520)γ decay amplitude, applicable to any strange isosinglet spin-3/2 baryon, and calculate the branching fraction and helicity amplitudes. Large-energy form factor relations are worked out, and it is shown that the helicity-3/2 amplitudes vanish at lowest order in soft-collinear effective theory (SCET). The suppression can be tested experimental...
متن کاملPhotoproduction of Baryons Decaying into N π and N η
A combined analysis of photoproduction data on γp → πN, ηN was performed including the data on KΛ and KΣ. The data are interpreted in an isobar model with s–channel baryon resonances and π, ρ (ω), K, and K * exchange in the t–channel. Three baryon resonances have a substantial coupling to ηN,
متن کاملDecaying Dark Matter Baryons in a Composite Messenger Model
A baryonic bound state with a mass of O(100) TeV, which is composed of strongly interacting messenger quarks in the low scale gauge mediation, can naturally be the cold dark matter. Interestingly, we find that such a baryonic dark matter is generically metastable, and the decay of this dark matter can naturally explain the anomalous positron flux recently observed by the PAMELA collaboration.
متن کاملThe magnetic moments of Λb and Λc baryons in light cone QCD sum rules
Using the most general form of the interpolating currents of heavy baryons, the magnetic moments of heavy baryons ΛQ (Q = b, c) are calculated in framework of the light cone QCD sum rules. A comparison of our results on magnetic moments with the existing theoretical results calculated in various other frameworks are presented. PACS number(s): 11.55.Hx, 13.40.Em, 14.20.Lq, 14.20.Mr e-mail: talie...
متن کاملHeavy Quark Distribution Functions in Heavy Baryons
Using the Bethe-Salpeter (B-S) equations for heavy baryons ΛQ, ΣQ, ΞQ and ΩQ (Q = b or c), which were established in previous work, we calculate the heavy quark distribution functions in these baryons. The numerical results indicate that these distribution functions have an obvious peak at some fraction, α0, of the baryon’s light-cone “plus” momentum component carried by the heavy quark, and th...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2017
ISSN: 1029-8479
DOI: 10.1007/jhep11(2017)138