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arXiv · 1609.03878

Di-Jet Imbalance Measurements at $\sqrt{s_{NN}} = 200$ GeV at STAR

STAR Collaboration·L. Adamczyk·J. K. Adkins·G. Agakishiev·M. M. Aggarwal·Z. Ahammed·I. Alekseev·D. M. Anderson·R. Aoyama·A. Aparin·D. Arkhipkin·E. C. Aschenauer·M. U. Ashraf·A. Attri·G. S. Averichev·X. Bai·V. Bairathi·R. Bellwied·A. Bhasin·A. K. Bhati·P. Bhattarai·J. Bielcik·J. Bielcikova·L. C. Bland·I. G. Bordyuzhin·J. Bouchet·J. D. Brandenburg·A. V. Brandin·D. Brown·I. Bunzarov·J. Butterworth·H. Caines·M. Calderón de la Barca Sánchez·J. M. Campbell·D. Cebra·I. Chakaberia·P. Chaloupka·Z. Chang·A. Chatterjee·S. Chattopadhyay·J. H. Chen·X. Chen·J. Cheng·M. Cherney·W. Christie·G. Contin·H. J. Crawford·S. Das·L. C. De Silva·R. R. Debbe·T. G. Dedovich·J. Deng·A. A. Derevschikov·L. Didenko·C. Dilks·X. Dong·J. L. Drachenberg·J. E. Draper·C. M. Du·L. E. Dunkelberger·J. C. Dunlop·L. G. Efimov·N. Elsey·J. Engelage·G. Eppley·R. Esha·S. Esumi·O. Evdokimov·J. Ewigleben·O. Eyser·R. Fatemi·S. Fazio·P. Federic·J. Fedorisin·Z. Feng·P. Filip·Y. Fisyak·C. E. Flores·L. Fulek·C. A. Gagliardi·D. Garand·F. Geurts·A. Gibson·M. Girard·L. Greiner·D. Grosnick·D. S. Gunarathne·Y. Guo·A. Gupta·S. Gupta·W. Guryn·A. I. Hamad·A. Hamed·R. Haque·J. W. Harris·L. He·S. Heppelmann·A. Hirsch·G. W. Hoffmann·S. Horvat
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Abstract

We report the first di-jet transverse momentum asymmetry measurements from Au+Au and p+p collisions at RHIC. The two highest-energy back-to-back jets reconstructed from fragments with transverse momenta above 2 GeV/c display a significantly stronger momentum imbalance in heavy-ion collisions than in the p+p reference. When re-examined with correlated soft particles included, we observe that these di-jets then exhibit a unique new feature -- momentum balance is restored to that observed in p+p for a jet resolution parameter of R=0.4, while re-balancing is not attained with a smaller value of R=0.2.

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STAR Collaboration, L. Adamczyk, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, D. M. Anderson, R. Aoyama, A. Aparin, D. Arkhipkin, E. C. Aschenauer, M. U. Ashraf, A. Attri, G. S. Averichev, X. Bai, V. Bairathi, R. Bellwied, A. Bhasin, A. K. Bhati, P. Bhattarai, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, J. Bouchet, J. D. Brandenburg, A. V. Brandin, D. Brown, I. Bunzarov, J. Butterworth, H. Caines, M. Calderón de la Barca Sánchez, J. M. Campbell, D. Cebra, I. Chakaberia, P. Chaloupka, Z. Chang, A. Chatterjee, S. Chattopadhyay, J. H. Chen, X. Chen, J. Cheng, M. Cherney, W. Christie, G. Contin, H. J. Crawford, S. Das, L. C. De Silva, R. R. Debbe, T. G. Dedovich, J. Deng, A. A. Derevschikov, L. Didenko, C. Dilks, X. Dong, J. L. Drachenberg, J. E. Draper, C. M. Du, L. E. Dunkelberger, J. C. Dunlop, L. G. Efimov, N. Elsey, J. Engelage, G. Eppley, R. Esha, S. Esumi, O. Evdokimov, J. Ewigleben, O. Eyser, R. Fatemi, S. Fazio, P. Federic, J. Fedorisin, Z. Feng, P. Filip, Y. Fisyak, C. E. Flores, L. Fulek, C. A. Gagliardi, D. Garand, F. Geurts, A. Gibson, M. Girard, L. Greiner, D. Grosnick, D. S. Gunarathne, Y. Guo, A. Gupta, S. Gupta, W. Guryn, A. I. Hamad, A. Hamed, R. Haque, J. W. Harris, L. He, S. Heppelmann, A. Hirsch, G. W. Hoffmann, S. Horvat. 2016-09-13. Di-Jet Imbalance Measurements at $\sqrt{s_{NN}} = 200$ GeV at STAR. https://doi.org/10.1103/physrevlett.119.062301

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