In the fragmentation of a transversely polarized quark several left–right asymmetries are possible for the hadrons in the jet. When only one unpolarized hadron is selected, it exhibits an azimuthal modulation known as the Collins effect. When a pair of oppositely charged hadrons is observed, three asymmetries can be considered, a di-hadron asymmetry and two single hadron asymmetries. In lepton deep inelastic scattering on transversely polarized nucleons all these asymmetries are coupled with the transversity distribution. From the high statistics COMPASS data on oppositely charged hadron-pair production we have investigated for the first time the dependence of these three asymmetries on the difference of the azimuthal angles of the two hadrons. The similarity of transversity induced single and dihadron asymmetries is discussed. A new analysis of the data allows quantitative relationships to be established among them, providing for the first time strong experimental indication that the underlying fragmentation mechanisms are all driven by a common physical process.

Interplay among transversity induced asymmetries in hadron leptoproduction

BIRSA, RENATO;BRADAMANTE, FRANCO;BRESSAN, Andrea;DALLA TORRE, SILVIA;DASGUPTA, SHUDDHA SHANKAR;DUIC, VENICIO;LEVORATO, STEFANO;Makke, Nour;MARTIN, ANNA;MATOUSEK, JAN;SBRIZZAI, GIULIO;SCHIAVON, PAOLO;SOZZI, FEDERICA;TESSAROTTO, FULVIO;
2016

Abstract

In the fragmentation of a transversely polarized quark several left–right asymmetries are possible for the hadrons in the jet. When only one unpolarized hadron is selected, it exhibits an azimuthal modulation known as the Collins effect. When a pair of oppositely charged hadrons is observed, three asymmetries can be considered, a di-hadron asymmetry and two single hadron asymmetries. In lepton deep inelastic scattering on transversely polarized nucleons all these asymmetries are coupled with the transversity distribution. From the high statistics COMPASS data on oppositely charged hadron-pair production we have investigated for the first time the dependence of these three asymmetries on the difference of the azimuthal angles of the two hadrons. The similarity of transversity induced single and dihadron asymmetries is discussed. A new analysis of the data allows quantitative relationships to be established among them, providing for the first time strong experimental indication that the underlying fragmentation mechanisms are all driven by a common physical process.
http://www.sciencedirect.com/science/journal/03702693
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2871241
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