scholarly journals Measurement of the $$e^+e^- \rightarrow K^+ K^- \pi ^0$$ cross section with the SND detector

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
M. N. Achasov ◽  
A. Yu. Barnyakov ◽  
M. Yu. Barnyakov ◽  
A. A. Baykov ◽  
K. I. Beloborodov ◽  
...  
Keyword(s):  
Mass Spectrum ◽  
Cross Section ◽  
Intermediate State ◽  
Center Of Mass ◽  
Mass Energy ◽  
Dominant Mechanism ◽  
Center Of Mass Energy ◽  
Comparable Accuracy ◽  
Babar Experiment ◽  
Measured Mass

AbstractThe process $$e^+e^-\rightarrow K^+K^-\pi ^0$$ e + e - → K + K - π 0 is studied with the SND detector at the VEPP-2000 $$e^+e^-$$ e + e - collider. Basing on data with an integrated luminosity of 26.4 $$\hbox {pb}^{-1}$$ pb - 1 we measure the $$e^+e^-\rightarrow K^+K^-\pi ^0$$ e + e - → K + K - π 0 cross section in the center-of-mass energy range from 1.28 up to 2 GeV. The measured mass spectrum of the $$K\pi $$ K π system indicates that the dominant mechanism of this reaction is the transition through the $$K^{*}(892)K$$ K ∗ ( 892 ) K intermediate state. The cross section for the $$\phi \pi ^0$$ ϕ π 0 intermediate state is measured separately. The SND results are consistent with previous measurements in the BABAR experiment and have comparable accuracy. We study the effect of the interference between the $$\phi \pi ^0$$ ϕ π 0 and $$K^*K$$ K ∗ K amplitudes. It is found that the interference gives sizable contribution to the measured $$e^+e^- \rightarrow \phi \pi ^0\rightarrow K^+K^-\pi ^0$$ e + e - → ϕ π 0 → K + K - π 0 cross section below 1.7 GeV.

scholarly journals Measurement of the spectral function for the $τ^-\to K^-K_Sν_τ$ decay in BABAR experiment

2019 ◽  
Author(s):  
Sergey Serednyakov
Keyword(s):  
Mass Spectrum ◽  
Spectral Function ◽  
Branching Fraction ◽  
Center Of Mass ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Babar Experiment ◽  
Babar Detector

The decay \mathbf{\tau^{-}\to K^{-}K_S\nu_{\tau}}𝛕−→𝐊−𝐊𝐒𝛎𝛕 has been studied using \mathbf{430\times10^6 ~ e^+e^-\to \tau^+\tau^-}430×106𝐞+𝐞−→𝛕+𝛕− events produced at a center-of-mass energy around 10.6 GeV at the PEP-II collider and studied with the BABAR detector. The mass spectrum of the \mathbf{K^{-}K_S}𝐊−𝐊𝐒 system has been measured and the spectral function has been obtained. The measured branching fraction \mathbf{{\cal B}(\tau^{-}\to K^{-}K_S\nu_{\tau})= (0.739\pm 0.011(\rm stat.)\pm 0.020(\rm syst.))}\mathbf{\times 10^{-3}}×10−3 is found to be in agreement with earlier measurements.

scholarly journals The total hadronic cross section for e+e− annihilation between 3.1 and 4.8 GeV center of mass energy

1977 ◽  
Vol 66 (4) ◽  
pp. 395-400 ◽  
Author(s):  
J. Burmester ◽  
L. Criegee ◽  
H.C. Dehne ◽  
K. Derikum ◽  
R. Devenish ◽  
...  
Keyword(s):  
Cross Section ◽  
Center Of Mass ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Hadronic Cross Section ◽  
Total Hadronic Cross Section

scholarly journals Recent BaBar results in light hadron spectroscopy

2019 ◽  
Vol 212 ◽  
pp. 04006
Author(s):  
Evgeny Kozyrev ◽  
Evgeny Solodov ◽  
Vladimir Druzhinin
Keyword(s):  
Center Of Mass ◽  
Mass Energy ◽  
Full Data ◽  
Data Set ◽  
Hadron Spectroscopy ◽  
Center Of Mass Energy ◽  
Two Photon ◽  
Light Hadron ◽  
Photon Process ◽  
Babar Experiment

We report the results on the channels e+e−→ π+π−π0π0π0(η), e+e−→ π+π−η. Also we present the study of the two-photon process e+e−→ e+e−η' in the double-tag mode. The results for the form factor are compared with the predictions based on pQCD and VMD. The results are obtained by using the full data set of about 470 fb−1 collected by the BABAR experiment at the PEP-II e+e−collider at a center-of-mass energy of about 10.6 GeV.

scholarly journals High-energy resummation in heavy-quark pair hadroproduction

2019 ◽  
Vol 79 (11) ◽  
Author(s):  
A. D. Bolognino ◽  
Francesco Giovanni Celiberto ◽  
M. Fucilla ◽  
D. Yu. Ivanov ◽  
A. Papa
Keyword(s):  
Heavy Quark ◽  
Cross Section ◽  
Center Of Mass ◽  
High Energy ◽  
Heavy Quarks ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Large Separation ◽  
Bfkl Approach ◽  
Heavy Quark Pair

AbstractThe inclusive hadroproduction of two heavy quarks, featuring a large separation in rapidity, is proposed as a novel probe channel of the Balitsky–Fadin–Kuraev–Lipatov (BFKL) approach. In a theoretical setup which includes full resummation of leading logarithms in the center-of-mass energy and partial resummation of the next-to-leading ones, predictions for the cross section and azimuthal coefficients are presented for kinematic configurations typical of current and possible future experimental analyses at the LHC.

scholarly journals Study of the process $$e^+e^- \rightarrow \eta \pi ^0\gamma $$ in the energy range $$\sqrt{s} = {1.05-2.00}$$ GeV with the SND detector

2020 ◽  
Vol 80 (11) ◽  
Author(s):  
M. N. Achasov ◽  
A. Yu. Barnyakov ◽  
A. A. Baykov ◽  
K. I. Beloborodov ◽  
A. V. Berdyugin ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Center Of Mass ◽  
Wide Energy Range ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Wide Energy ◽  
Radiation Processes ◽  
Using Data ◽  
First Time

AbstractThe process $$e^+e^-\rightarrow \eta \pi ^0\gamma $$ e + e - → η π 0 γ is studied in the center-of-mass energy range 1.05–2.00 GeV using data with an integrated luminosity of 94.5 $$\hbox {pb}^{-1}$$ pb - 1 collected by the SND detector at the VEPP-2000 $$e^{+}e^{-}$$ e + e - collider. The $$e^+e^-\rightarrow \eta \pi ^0\gamma $$ e + e - → η π 0 γ cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the $$\omega \eta $$ ω η intermediate state. The measured cross section of the subprocess $$e^+e^-\rightarrow \omega \eta \rightarrow \eta \pi ^0\gamma $$ e + e - → ω η → η π 0 γ is consistent with previous measurements in the $$e^+e^-\rightarrow \pi ^+\pi ^-\pi ^0\eta $$ e + e - → π + π - π 0 η mode. It is found, with a significance of $$5.6\sigma $$ 5.6 σ , that the process $$e^+e^-\rightarrow \eta \pi ^0\gamma $$ e + e - → η π 0 γ is not completely described by hadronic vector-pseudoscalar intermediate states. The cross section of this missing contribution, which can originate from radiation processes, e. g. $$e^+e^-\rightarrow a_{0}(1450)\gamma $$ e + e - → a 0 ( 1450 ) γ , is measured. It is found to be 15–20 pb in the wide energy range from 1.3 to 1.9 GeV.

scholarly journals Extracting the QCD ΛMS¯ parameter in Drell–Yan process using Collins–Soper–Sterman approach

2017 ◽  
Vol 32 (10) ◽  
pp. 1750040 ◽  
Author(s):  
R. Taghavi ◽  
A. Mirjalili
Keyword(s):  
Experimental Data ◽  
Transverse Momentum ◽  
Cross Section ◽  
Center Of Mass ◽  
Distribution Functions ◽  
Mass Energy ◽  
Transverse Momentum Dependent ◽  
Center Of Mass Energy ◽  
Dimensional Transmutation ◽  
High Center

In this work, we directly fit the QCD dimensional transmutation parameter, [Formula: see text], to experimental data of Drell–Yan (DY) observables. For this purpose, we first obtain the evolution of transverse momentum dependent parton distribution functions (TMDPDFs) up to the next-to-next-to-leading logarithm (NNLL) approximation based on Collins–Soper–Sterman (CSS) formalism. As is expecting the TMDPDFs are appearing at larger values of transverse momentum by increasing the energy scales and also the order of approximation. Then we calculate the cross-section related to the TMDPDFs in the DY process. As a consequence of global fitting to the five sets of experimental data at different low center-of-mass energies and one set at high center-of-mass energy, using CETQ06 parametrizations as our boundary condition, we obtain [Formula: see text] MeV corresponding to the renormalized coupling constant [Formula: see text] which is within the acceptable range for this quantity. The goodness of [Formula: see text] shows the results for DY cross-section are in good agreement with different experimental sets, containing E288, E605 and R209 at low center-of-mass energies and [Formula: see text], CDF data at high center-of-mass energy. The repeated calculations, using HERAPDFs parametrizations is yielding us numerical values for fitted parameters very close to what we obtain using CETQ06 PDFs set. This indicates that the obtained results have enough stability by variations in the boundary conditions.

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