scholarly journals Phenomenological study of helicity amplitudes of high energy exclusive leptoproduction of theρmeson

2011 ◽  
Vol 84 (5) ◽  
Author(s):  
I. V. Anikin ◽  
A. Besse ◽  
D. Yu. Ivanov ◽  
B. Pire ◽  
L. Szymanowski ◽  
...  
Keyword(s):  
Phenomenological Study ◽  
High Energy ◽  
Helicity Amplitudes

scholarly journals Phenomenological study of high-energy exchanges based on multiperipheral ideas

1972 ◽  
Vol 5 (1) ◽  
pp. 9-14 ◽  
Author(s):  
C. Ferro Fontan ◽  
L. Masperi ◽  
R. Page
Keyword(s):  
Phenomenological Study ◽  
High Energy ◽  
Energy Exchanges

Measurements of the spin rotation parameterR in high energy elastic scattering and helicity amplitudes at Serpukhov energies

1976 ◽  
Vol 26 (1) ◽  
pp. 13-24 ◽  
Author(s):  
J. Pierrard ◽  
C. Bruneton ◽  
J. Bystricky ◽  
G. Cozzika ◽  
J. Deregel ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
High Energy ◽  
Spin Rotation ◽  
Helicity Amplitudes

scholarly journals High Energy Rho Meson Leptoproduction §

2014 ◽  
Vol 1 (1) ◽  
pp. 33-35
Author(s):  
Adrien Besse ◽  
Lech Szymanowski ◽  
Samuel Wallon
Keyword(s):  
Cross Sections ◽  
Scattering Amplitude ◽  
Good Description ◽  
High Energy ◽  
Energy Limit ◽  
Rho Meson ◽  
Forward Limit ◽  
Helicity Amplitudes ◽  
Impact Parameter Space ◽  
The Impact

We investigate the longitudinal and transverse polarized cross-sections of the leptoproduction of the ρ meson in the high energy limit. Our model is based on the computation of the impact factor γ*(λγ)→ ρ (λρ) using the twist expansion in the forward limit which is expressed in the impact parameter space. This treatment involves in the final stage the twist 2 and twist 3 distribution amplitudes (DAs) of the ρ meson and the dipole scattering amplitude. Taking models that exist for the DAs and for the dipole cross-section. We get a phenomenological model for the helicity amplitudes. We compare our predictions with HERA data and get a fairly good description for large enough virtualities of the photon. PACS number(s): 13.60.Le, 12.39.St, 12.38.Bx.

Relations between helicity amplitudes in high-energy elastic p-p scattering

1969 ◽  
Vol 1 (7) ◽  
pp. 369-374 ◽  
Author(s):  
H. A. Neal ◽  
Bing-lin Young
Keyword(s):  
High Energy ◽  
Helicity Amplitudes

scholarly journals Loops and trees in generic EFTs

2020 ◽  
Vol 2020 (8) ◽  
Author(s):  
Nathaniel Craig ◽  
Minyuan Jiang ◽  
Ying-Ying Li ◽  
Dave Sutherland
Keyword(s):  
Standard Model ◽  
High Energy ◽  
Tree Level ◽  
Energy Limit ◽  
High Energy Limit ◽  
Functional Methods ◽  
Weakly Coupled ◽  
The Standard Model ◽  
Helicity Amplitudes ◽  
The Impact

Abstract We consider aspects of tree and one-loop behavior in a generic 4d EFT of massless scalars, fermions, and vectors, with a particular eye to the high-energy limit of the Standard Model EFT at operator dimensions 6 and 8. First, we classify the possible Lorentz structures of operators and the subset of these that can arise at tree-level in a weakly coupled UV completion, extending the tree/loop classification through dimension 8 using functional methods. Second, we investigate how operators contribute to tree and one-loop helicity amplitudes, exploring the impact of non-renormalization theorems through dimension 8. We further observe that many dimension 6 contributions to helicity amplitudes, including rational parts, vanish exactly at one-loop level. This suggests the impact of helicity selection rules extends beyond one loop in non-supersymmetric EFTs.

scholarly journals Time-dependent study of KS → π+π− decays for flavour physics measurements

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
P. Pakhlov ◽  
V. Popov
Keyword(s):  
High Energy Physics ◽  
Phenomenological Study ◽  
Mixing Time ◽  
High Energy ◽  
Decay Rates ◽  
Time Dependent ◽  
Decay Pattern ◽  
Rare Phenomena ◽  
Physics Experiments ◽  
Energy Physics

Abstract Nowadays High Energy Physics experiments can accumulate unprecedented statistics of heavy flavour decays that allows to apply new methods, based on the study of very rare phenomena, which used to be just desperate. In this paper we propose a new method to measure composition of K0-$$ \overline{K} $$ K ¯ 0, produced in a decay of heavy hadrons. This composition contains important information, in particular about weak and strong phases between amplitudes of the produced K0 and $$ \overline{K} $$ K ¯ 0. We consider possibility to measure these parameters with time-dependent K0 → π+π− analysis. Due to C P -violation in kaon mixing time-dependent decay rates of K0 and $$ \overline{K} $$ K ¯ 0 differ, and the initial amplitudes revealed in the CP-violating decay pattern. We perform phenomenological study of K0 decay evolution initially produced as a combination $$ a\left.|{K}^0(t)\right\rangle +b\left.|{\overline{K}}^0(t)\right\rangle $$ a K 0 t + b K ¯ 0 t , where a and b, complex amplitudes, could also be dependent on decay time of heavy mother particle. In particular we consider cases of charmed hadrons decays: D+ → K0π+, $$ {D}_s^{+} $$ D s + → K0K+, Λ → pK0 and with some assumptions D0 → K0π0. This can be used to test the sum rule for charmed mesons and to obtain input for the full constraint of the two body amplitudes of D-mesons.

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