First measurement of interference fragmentation on a transversely polarized hydrogen target
P.B. van der Nat (for the HERMES collaboration)
TL;DR
This paper reports the first measurement of interference fragmentation functions in semi-inclusive two-pion production using a transversely polarized hydrogen target, providing a new way to probe the transversity distribution in nucleons.
Contribution
It presents the first experimental measurement of single target-spin asymmetries related to interference fragmentation functions in two-pion production with a transversely polarized hydrogen target.
Findings
Measured asymmetries deviate significantly from zero in the specified mass range
Demonstrated that two-pion semi-inclusive deep-inelastic scattering can probe transversity
First experimental evidence linking interference fragmentation functions to transversity
Abstract
The HERMES experiment has measured for the first time single target-spin asymmetries in semi-inclusive two-pion production using a transversely polarized hydrogen target. These asymmetries are related to the product of two unknowns, the transversity distribution function and the interference fragmentation function. In the invariant mass range 0.51 GeV < M_inv < 0.97 GeV the measured asymmetry deviates significantly from zero, indicating that two-pion semi-inclusive deep-inelastic scattering can be used to probe transversity.
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