Studies of Light Pseudoscalar Mesons at BESIII

Redmer, C. F.

doi:10.1051/epjconf/20147200021

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The Hadronic Light-by-light Scattering1

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2016

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“…New measurements of space-like TFF have been announced by the BESIII and KLOE-2 collaborations. At BESIII, 2.9 fb −1 of data taken at √ s = 3.773 GeV/c 2 are used to measure the TFF of π 0 at momentum transfers of 0.3 ≤ Q 2 [GeV 2 ] ≤ 3.1 [28,29]. Estimates based on Monte Carlo studies suggest an unprecedented statistical accuracy for Q 2 > 1.5 GeV 2 and competitive results at higher momentum transfers.…”

Section: The Hadronic Light-by-light Scatteringmentioning

confidence: 99%

Hadronic inputs to the (g– 2)_μpuzzle

Redmer

2016

EPJ Web Conf.

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Abstract. There is a long standing discrepancy of 3 -4 standard deviations between the direct measurement and the Standard Model prediction of the anomalous magnetic moment of the muon (g − 2) μ . While new direct measurements have been proposed to clarify the situation, theory calculations are completely limited by the accuracy of the hadronic contributions to (g − 2) μ . In order to increase their precision, experimental information can be used as input. In this presentation we will discuss recent and future measurements of relevant hadronic cross sections and transition form factors.

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Section: The Hadronic Light-by-light Scatteringmentioning

confidence: 99%