An energy sum constraint of event mixing for Bose-Einstein correlations in reactions with &pi;&pi;X final states around 1 GeV

Qing-Hua He

doi:10.1088/1674-1137/42/7/074004

Chinese Physics C> 2018, Vol. 42> Issue(7) : 074004 DOI: 10.1088/1674-1137/42/7/074004

An energy sum constraint of event mixing for Bose-Einstein correlations in reactions with ππX final states around 1 GeV

Qing-Hua He

1.
Department of Nuclear Science and Engineering, Nanjing University of Aeronautics and Astronautics, (NUAA), Nanjing 210016, China

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Abstract：
We present a new event mixing technique for measuring two-pion Bose-Einstein correlations (BEC) in reactions with only two identical bosons among three final state particles. This new mixing method contains a missing mass consistency (MMC) cut and an energy sum order (ESO) cut. Unlike the previous proposed pion energy cut, which abandons nearly half the original events, the ESO cut does not eliminate any original events and hence improves the statistics of both original events and mixed events. Numerical tests using the γp→π⁰π⁰p events around 1 GeV are carried out to verify the validity of the ESO cut. This cut is able to reproduce the relative momentum distribution of the original events in the absence of BEC effects. In addition, its ability to observe BEC effects is tested by an event sample in the presence of BEC effects. Simulation results show the BEC effects can be observed clearly as an enhancement in the correlation function, and the BEC parameters extracted by this event mixing cut are consistent with the input BEC parameters.
- Bose-Einstein correlations ,
- photoproduction ,
- event mixing

References

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Qing-Hua He. An energy sum constraint of event mixing for Bose-Einstein correlations in reactions with ππX final states around 1 GeV[J]. Chinese Physics C, 2018, 42(7): 074004. doi: 10.1088/1674-1137/42/7/074004

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Received: 2018-02-26
Revised: 2018-04-20

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Supported by Fundamental Research Funds for the Central Universities (1006-YAH17063, 1006-XAA18059)

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

An energy sum constraint of event mixing for Bose-Einstein correlations in reactions with ππX final states around 1 GeV

1. Department of Nuclear Science and Engineering, Nanjing University of Aeronautics and Astronautics, (NUAA), Nanjing 210016, China

Received Date: 2018-02-26

Accepted Date: 2018-04-20

Available Online: 2018-07-05

Fund Project: Supported by Fundamental Research Funds for the Central Universities (1006-YAH17063, 1006-XAA18059)

Abstract: We present a new event mixing technique for measuring two-pion Bose-Einstein correlations (BEC) in reactions with only two identical bosons among three final state particles. This new mixing method contains a missing mass consistency (MMC) cut and an energy sum order (ESO) cut. Unlike the previous proposed pion energy cut, which abandons nearly half the original events, the ESO cut does not eliminate any original events and hence improves the statistics of both original events and mixed events. Numerical tests using the γp→π⁰π⁰p events around 1 GeV are carried out to verify the validity of the ESO cut. This cut is able to reproduce the relative momentum distribution of the original events in the absence of BEC effects. In addition, its ability to observe BEC effects is tested by an event sample in the presence of BEC effects. Simulation results show the BEC effects can be observed clearly as an enhancement in the correlation function, and the BEC parameters extracted by this event mixing cut are consistent with the input BEC parameters.

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An energy sum constraint of event mixing for Bose-Einstein correlations in reactions with ππX final states around 1 GeV

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An energy sum constraint of event mixing for Bose-Einstein correlations in reactions with ππX final states around 1 GeV

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