![Initial-State Radiation Measurement of the E+e- -] Pi+pi-pi+pi- Cross Section PDF](https://books.google.com/books/content/images/frontcover/6b2RwgEACAAJ?fife=w150-h200)
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Languages : en
Pages : 19
Book Description
Initial-State Radiation Measurement of the E+e- -] Pi+pi-pi+pi- Cross Section
![Initial-State Radiation Measurement of the E+e- -] Pi+pi-pi+pi- Cross Section PDF](https://books.google.com/books/content/images/frontcover/6b2RwgEACAAJ?fife=w80-h100)
Author: Measurement of the E+e- → Pi+pi-pi+pi- Cross Section Using Initial State Radiation at BABAR
Author: Andreas HafnerMeasurement of the E + E - Pi + Pi - Cross Section Using Initial State Radiation at BESIII
Author: Benedikt KlossMeasurement of the E+ E- to Pi+ Pi- Pi+ Pi-, K+ K- Pi+ Pi-, K+ K- K+ K- Cross Sections Using Initial State Radiation at BaBar
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Languages : en
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Book Description
First results of a study of the ee− → ?+?−?+?−? process with hard photon emitted from initial state are presented. About 60000 fully reconstructed events have been selected based on 89.3 fb−1 of BABAR data. The invariant mass of the hadronic final state defines the effective collision c.m. energy, and so BABAR ISR data can be compared to the relevant direct e+e− measurements. From obtained 4? mass spectrum we evaluate e+e− → ?+?−?+?− cross section for the range of c.m.s. energy from 0.6 to 4.5 GeV. The systematic error of the cross section measurement is 5% and comparable with the best e+e− data. The cross sections for identified 2K2? and 4K final states also have been presented.
Precise Measurement of the E+ E- \to Pi+ Pi-? Cross Section with the Initial-State Radiation Method at BABAR.
Author: Measuerement of the E+e- → Π+π-π+π- [pi +pi -pi +pi -] Cross Section Using Initial State Radiation at BABAR
![Measuerement of the E+e- → Π+π-π+π- [pi +pi -pi +pi -] Cross Section Using Initial State Radiation at BABAR PDF](https://books.google.com/books/content/images/frontcover/q3XEzQEACAAJ?fife=w80-h100)
Author: Andreas HafnerMeasurement of the E+ E- → Pi+ Pi- 2pi0 and E+ E- → Pi+ Pi- 3pi0 Cross Sections Using Initial State Radiation at BaBar
Author: Konrad GriessingerThe Epem to Pi+ Pi- Pi+ Pi-, K+ K- Pi+ Pi-, and K+ K- K+ K- Cross Sections at Center-of-Mass Energies 0.5--4.5G̃eV Measured with Initial-State Radiation
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Languages : en
Pages :
Book Description
We study the process ee− 2!?+?−?+?−?, with a hard photon radiated from the initial state. About 60,000 fully reconstructed events have been selected from 89 fb−1 of BABAR data. The invariant mass of the hadronic final state defines the effective e+e− center-of-mass energy, so that these data can be compared with the corresponding direct e+e− measurements. From the 4?-mass spectrum, the cross section for the process e+e− 2!?+?−?+?− is measured for center-of-mass energies from 0.6 to 4.5 GeV. The uncertainty in the cross section measurement is typically 5%. We also measure the cross sections for the final states K+K−?+− and K+K−K+K−. We observe the J/? in all three final states and measure the corresponding branching fractions. We search for X(3872) in J/?(2!?+?−)?+?− and obtain an upper limit on the product of the e+e− width of the X(3872) and the branching fraction for X(3872) 2!J/??+?−.
The Contrast
Author: Cross Sections for the Reactions E+e to K+ K- Pi+pi-, K+ K- Pi0pi0, and K+ K- K+ K- Measured Using Initial-State Radiation
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Category :
Languages : en
Pages : 35
Book Description
We study the processes ee− 2!K+K−?+?-?, K+K−?°?°?, and K+K−K+K−?, where the photon is radiated from the initial state. About 84000, 8000, and 4200 fully reconstructed events, respectively, are selected from 454 fb−1 of BABAR data. The invariant mass of the hadronic final state defines the e+e− center-of-mass energy, so that the K+K−?+?−? data can be compared with direct measurements of the e+e− 2!K+K−?+?− reaction. No direct measurements exist for the e+e− 2!K+K−?°?° or e+e− 2!K+K−K+K− reactions, and we present an update of our previous result with doubled statistics. Studying the structure of these events, we find contributions from a number of intermediate states, and extract their cross sections. In particular, we perform a more detailed study of the e+e− 2!?(1020)??? reaction, and confirm the presence of the Y (2175) resonance in the?(1020)f0(980) and K+K− f0(980) modes. In the charmonium region, we observe the J/? in all three final states and in several intermediate states, as well as the?(2S) in some modes, and measure the corresponding branching fractions.