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The high centre-of-mass energy of 200 GeV available at the Relativistic HeavyIon Collider (RHIC) at Brookhaven opens up the hard scattering regime inheavy-ion collisions. Particles at large transverse momentum originate from theearly stage of the interaction and, therefore, probe the medium produced inthese collisions. To quantitatively understand the medium induced modificationof hadron production, precise measurements of identified hadrons in p+p andd+Au systems are required. This thesis presents the high transverse momentummeasurements of neutral pions and eta mesons through their di-photon decaychannel, performed with STAR Barrel Electromagnetic Calorimeter. The mediuminduced spectrum modification in d+Au collisions is also measured in comparisonto the most peripheral d+Au and to the p+p collisions. The results areconsistent with the previous STAR charged hadron measurements and with thetheory (QCD) calculations, as well as with measurements from PHENIX, anotherRHIC experiment.

Neutral meson production in d+Au and p+p collisions at sqrt(s_NN) = 200 GeV in STAR