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arXiv · 1905.06075

Measurements of the transverse-momentum-dependent cross sections of $J/ψ$ production at mid-rapidity in proton+proton collisions at $\sqrt{s} =$ 510 and 500 GeV with the STAR detector

STAR Collaboration·J. Adam·L. Adamczyk·J. R. Adams·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·F. Atetalla·A. Attri·G. S. Averichev·V. Bairathi·K. Barish·A. J. Bassill·A. Behera·R. Bellwied·A. Bhasin·A. K. Bhati·J. Bielcik·J. Bielcikova·L. C. Bland·I. G. Bordyuzhin·J. D. Brandenburg·A. V. Brandin·J. Bryslawskyj·I. Bunzarov·J. Butterworth·H. Caines·M. Calderón de la Barca Sánchez·D. Cebra·I. Chakaberia·P. Chaloupka·B. K. Chan·F-H. Chang·Z. Chang·N. Chankova-Bunzarova·A. Chatterjee·S. Chattopadhyay·J. H. Chen·X. Chen·J. Cheng·M. Cherney·W. Christie·H. J. Crawford·M. Csanád·S. Das·T. G. Dedovich·I. M. Deppner·A. A. Derevschikov·L. Didenko·C. Dilks·X. Dong·J. L. Drachenberg·J. C. Dunlop·T. Edmonds·N. Elsey·J. Engelage·G. Eppley·R. Esha·S. Esumi·O. Evdokimov·J. Ewigleben·O. Eyser·R. Fatemi·S. Fazio·P. Federic·J. Fedorisin·Y. Feng·P. Filip·E. Finch·Y. Fisyak·L. Fulek·C. A. Gagliardi·T. Galatyuk·F. Geurts·A. Gibson·K. Gopal·D. Grosnick·A. Gupta·W. Guryn·A. I. Hamad·A. Hamed·J. W. Harris·L. He·S. Heppelmann·N. Herrmann·L. Holub·Y. Hong·S. Horvat·B. Huang·H. Z. Huang·S. L. Huang·T. Huang
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Abstract

We present measurements of the differential cross sections of inclusive $J/ψ$ meson production as a function of transverse momentum ($p_{T}^{J/ψ}$) using the $μ^{+}μ^{-}$ and $e^{+}e^{-}$ decay channels in proton+proton collisions at center-of-mass energies of 510 and 500 GeV, respectively, recorded by the STAR detector at the Relativistic Heavy Ion Collider. The measurement from the $μ^{+}μ^{-}$ channel is for 0 $< p_{T}^{J/ψ} <$ 9 GeV/$c$ and rapidity range $|y^{J/ψ}| < $ 0.4, and that from the $e^{+}e^{-}$ channel is for 4 $< p_{T}^{J/ψ} <$ 20 GeV/$c$ and $|y^{J/ψ}| < $ 1.0. The $ψ(2S)$ to $J/ψ$ ratio is also measured for 4 $< p_{T}^{\rm meson} <$ 12 GeV/$c$ through the $e^{+}e^{-}$ decay channel. Model calculations, which incorporate different approaches toward the $J/ψ$ production mechanism, are compared with experimental results and show reasonable agreement within uncertainties.

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STAR Collaboration, J. Adam, L. Adamczyk, J. R. Adams, 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, F. Atetalla, A. Attri, G. S. Averichev, V. Bairathi, K. Barish, A. J. Bassill, A. Behera, R. Bellwied, A. Bhasin, A. K. Bhati, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, J. D. Brandenburg, A. V. Brandin, J. Bryslawskyj, I. Bunzarov, J. Butterworth, H. Caines, M. Calderón de la Barca Sánchez, D. Cebra, I. Chakaberia, P. Chaloupka, B. K. Chan, F-H. Chang, Z. Chang, N. Chankova-Bunzarova, A. Chatterjee, S. Chattopadhyay, J. H. Chen, X. Chen, J. Cheng, M. Cherney, W. Christie, H. J. Crawford, M. Csanád, S. Das, T. G. Dedovich, I. M. Deppner, A. A. Derevschikov, L. Didenko, C. Dilks, X. Dong, J. L. Drachenberg, J. C. Dunlop, T. Edmonds, N. Elsey, J. Engelage, G. Eppley, R. Esha, S. Esumi, O. Evdokimov, J. Ewigleben, O. Eyser, R. Fatemi, S. Fazio, P. Federic, J. Fedorisin, Y. Feng, P. Filip, E. Finch, Y. Fisyak, L. Fulek, C. A. Gagliardi, T. Galatyuk, F. Geurts, A. Gibson, K. Gopal, D. Grosnick, A. Gupta, W. Guryn, A. I. Hamad, A. Hamed, J. W. Harris, L. He, S. Heppelmann, N. Herrmann, L. Holub, Y. Hong, S. Horvat, B. Huang, H. Z. Huang, S. L. Huang, T. Huang. 2019-08-26. Measurements of the transverse-momentum-dependent cross sections of $J/ψ$ production at mid-rapidity in proton+proton collisions at $\sqrt{s} =$ 510 and 500 GeV with the STAR detector. https://doi.org/10.1103/physrevd.100.052009

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