New results from New results from Delia Hasch DPG Spring Meeting 2004 – Nuclear Physics Cologne (Germany) March, 8-12 2004 (on behalf of the HERMES Collaboration) •Exotic baryons: the HERMES pentaquark •Spin: first measurement of Transversity •Nuclear matter: production and transport of hadrons
New results from. Delia Hasch. (on behalf of the HERMES Collaboration). DPG Spring Meeting 2004 – Nuclear Physics. Cologne (Germany) March, 8-12 2004. Exotic baryons: the HERMES pentaquark Spin: first measurement of Transversity Nuclear matter: production and transport of hadrons. - PowerPoint PPT Presentation
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[X.N.Wang et al., NPA696(2001)788, PRL89(2002)162301]
fixed by HERMES data
Gluon density Gluon density
[X.N.Wang et al., NPA696(2001)788, PRL89(2002)162301]
•cold <--> hot nuclear matter correlation
•gluon density in Au+Au~15 times higher than in cold matter
Conclusion & Conclusion & outlookoutlook
Delia Hasch
ongoing data taking with 3 tracks trigger for exotics search
exotics
narrow exotic baryon resonance has been directly reconstructed
{M= 1528 ± 2.6 ± 2.1 MeV= 8 ± 2 MeV
precise determination of the mass
background description by Monte Carlo simulation
Conclusion & Conclusion & outlookoutlook
Delia Hasch
exotics narrow exotic baryon resonance has been directly reconstructed
{M= 1528 ± 2.6 ± 2.1 MeV= 8 ± 2 MeV
precise determination of the mass
background description by Monte Carlo simulation
first observation of non-zero Sivers effect
sizeable Collins asymmetries measured for 0 and -; +puzzle
spin: transversity
a kind of brain storm is underway for model interpretation
ongoing data taking with transverselypolarised target
Conclusion & Conclusion & outlookoutlook
Delia Hasch
exotics narrow exotic baryon resonance has been directly reconstructed
{M= 1528 ± 2.6 ± 2.1 MeV= 8 ± 2 MeV
precise determination of the mass
background description by Monte Carlo simulation
first observation of non-zero Sivers effect
sizeable Collins asymmetries measured for 0 and -; +puzzle
spin: transversity
a kind of brain storm is underway for model interpretationnuclear matter
significant hadron suppression in a wide kinematic regionfirst observation of hadron-type dependence of attenuation GOAL: obtain unambiguous information on hadron
formation and transport in cold nuclear matter
Conclusion & Conclusion & outlookoutlook
Delia Hasch
exotics narrow exotic baryon resonance has been directly reconstructed
{M= 1528 ± 2.6 ± 2.1 MeV= 8 ± 2 MeV
precise determination of the mass
background description by Monte Carlo simulation
first observation of non-zero Sivers effect
sizeable Collins asymmetries measured for 0 and -; +puzzle
spin: transversity
a kind of brain storm is underway for model interpretationnuclear matter
significant hadron suppression in a wide kinematic regionfirst observation of hadron-type dependence of attenuation
Stay tuned …New exiting results will come soon !
Uncertainty from diffractive VM Uncertainty from diffractive VM contributioncontribution