scholarly journals Measurement ofe+e−→Ds(*)+Ds(*)−cross sections near threshold using initial-state radiation

2011 ◽  
Vol 83 (1) ◽  
Author(s):  
G. Pakhlova ◽  
I. Adachi ◽  
H. Aihara ◽  
K. Arinstein ◽  
T. Aushev ◽  
...  
Keyword(s):  
Cross Sections ◽  
Initial State Radiation ◽  
Initial State ◽  
State Radiation ◽  
Near Threshold

scholarly journals e+e−→K+K−π+π−,K+K−π0π0andK+K−K+K−cross sections measured with initial-state radiation

2007 ◽  
Vol 76 (1) ◽  
Author(s):  
B. Aubert ◽  
M. Bona ◽  
D. Boutigny ◽  
Y. Karyotakis ◽  
J. P. Lees ◽  
...  
Keyword(s):  
Cross Sections ◽  
Initial State Radiation ◽  
Initial State ◽  
State Radiation

scholarly journals Dark initial state radiation and the kinetic mixing portal

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Thomas G. Rizzo
Keyword(s):  
Cross Sections ◽  
Gauge Coupling ◽  
Mass Range ◽  
Initial State Radiation ◽  
Microwave Background ◽  
Initial State ◽  
Complex Scalar ◽  
Dark Photon ◽  
State Radiation ◽  
Relic Density

Abstract Data from Planck measurements of the cosmic microwave background (CMB) place important constraints on models with light dark matter (DM) and light mediators especially when both lie in the mass range below ∼ 1 GeV. In models involving kinetic mixing where the dark photon acts as the mediator, these constraints are easily satisfied and the appropriate DM relic density achievable if the DM is, e.g., a complex scalar, where p-wave annihilation occurs, or is the lighter component of a split pseudo-Dirac state where co-annihilation dominates. In both of these cases, although higher order in the dark gauge coupling, gD, the corresponding annihilation processes including dark photon initial state radiation (ISR) will be dominantly s-wave with essentially temperature independent cross sections. The rates for these dark ISR associated processes, though not yielding cross sections large enough to contribute to the relic density, can still run into possible conflicts with the bounds arising from the CMB. In this paper we perform a preliminary study of the present and potential future constraints that the CMB imposes on the parameter spaces for both of these scenarios due to the existence of this dark ISR. Further analyses of the effects of dark ISR in DM annihilation is clearly warranted.

scholarly journals Measurement of the e+e−→Ks0K±π∓π0 and Ks0K±π∓η cross sections using initial-state radiation

2017 ◽  
Vol 95 (9) ◽  
Author(s):  
J. P. Lees ◽  
V. Poireau ◽  
V. Tisserand ◽  
E. Grauges ◽  
A. Palano ◽  
...  
Keyword(s):  
Cross Sections ◽  
Initial State Radiation ◽  
Initial State ◽  
State Radiation

scholarly journals Angular analysis of the e+e- → D(*)D* process near the open-charm threshold using initial-state radiation

2019 ◽  
Vol 202 ◽  
pp. 06008
Author(s):  
Valentina Zhukova
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Center Of Mass ◽  
Initial State Radiation ◽  
Initial State ◽  
Center Of Mass Energy ◽  
Belle Detector ◽  
Section Measurement ◽  
Angular Analysis ◽  
State Radiation

We report new measurement of the exclusive e+e- → D(*)±D*∓ cross sections as a function of center-of-mass energy from the D(∗)±D∗∓ threshold up to $ \sqrt s $ = 6.0 GeV with initial state radiation. The analysis is based on a data sample collected by the Belle detector with an integrated luminosity of 951 fb−1. The accuracy of the cross section measurement is increased by a factor of 2 in comparison with the first Belle study. We have performed the first angular analysis of the e+e- → D∗±D∗∓ process and decomposed this exclusive cross section into three components corresponding to the different D∗ helicities.

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