Measurement of Groomed Jet Substructure Observables in \pp Collisions at $\sqrt{s} = 200$ GeV with STAR

STAR Collaboration,Adam J.,Adamczyk L.,Adams J. R.,Adkins J. K.,Agakishiev G.,Aggarwal M. M., Ahammed Z.,Alekseev I.,Anderson D. M., Aparin A.,Aschenauer E. C., Ashraf M. U., Atetalla F. G., Attri A.,Averichev G. S., Bairathi V.,Barish K., Behera A.,Bellwied R.,Bhasin A., Bielcik J., Bielcikova J., Bland L. C., Bordyuzhin I. G., Brandenburg J. D., Brandin A. V.,Butterworth J., Caines H.,Sánchez M. Calderón de la Barca, Cebra D., Chakaberia I., Chaloupka P.,Chan B. K.,Chang F-H.,Chang Z., Chankova-Bunzarova N.,Chatterjee A.,Chen D.,Chen J. H.,Chen X.,Chen Z.,Cheng J.,Cherney M., Chevalier M., Choudhury S., Christie W.,Crawford H. J., Csanád M., Daugherity M., Dedovich T. G.,Deppner I. M.,Derevschikov A. A., Didenko L., Dong X., Drachenberg J. L.,Dunlop J. C., Edmonds T., Elsey N., Engelage J., Eppley G., Esha R., Esumi S., Evdokimov O., Ewigleben A., Eyser O., Fatemi R., Fazio S.,Federic P., Fedorisin J.,Feng C. J., Feng Y., Filip P., Finch E., Fisyak Y., Francisco A., Fulek L., Gagliardi C. A., Galatyuk T., Geurts F., Gibson A., Gopal K., Grosnick D., Guryn W., Hamad A. I., Hamed A., Harris J. W., He S., He W., He X., Heppelmann S., Herrmann N., Hoffman E., Holub L.,Hong Y., Horvat S., Hu Y., Huang H. Z., Huang S. L., Huang T.,Huang X., Humanic T. J., Huo P., Igo G., Isenhower D., Jacobs W. W., Jena C., Jentsch A., JI Y., Jia J.,Jiang K., Jowzaee S., Ju X., Judd E. G.,Kabana S., Kabir M. L.,Kagamaster S., Kalinkin D., Kang K., Kapukchyan D., Kauder K., Ke H. W., Keane D., Kechechyan A., Kelsey M., Khyzhniak Y. V.,Kikoła D. P.,Kim C., Kimelman B., Kincses D., Kinghorn T. A., Kisel I., Kiselev A., Kisiel A., Kocan M., Kochenda L., Kosarzewski L. K., Kramarik L., Kravtsov P., Krueger K.,Mudiyanselage N. Kulathunga, Kumar L.,Elayavalli R. Kunnawalkam, Kwasizur J. H., Lacey R., Lan S., Landgraf J. M., Lauret J., Lebedev A., Lednicky R., Lee J. H.,Leung Y. H.,Li C.,Li W.,Li X.,Li Y., Liang Y., Licenik R.,Lin T.,Lin Y., Lisa M. A.,Liu F.,Liu H., Liu P., Liu T.,Liu X.,Liu Y.,Liu Z., Ljubicic T., Llope W. J., Longacre R. S., Lukow N. S., Luo S.,Luo X.,Ma G. L.,Ma L., Ma R., Ma Y. G., Magdy N., Majka R., Mallick D., Margetis S., Markert C., Matis H. S.,Mazer J. A., Minaev N. G., Mioduszewski S., Mohanty B., Mondal M. M.,Mooney I., Moravcova Z., Morozov D. A., Nagy M., Nam J. D.,Nasim Md.,Nayak K., Neff D., Nelson J. M., Nemes D. B., Nie M., Nigmatkulov G., Niida T., Nogach L. V., Nonaka T., Odyniec G.,Ogawa A., Oh S., Okorokov V. A.,Page B. S., Pak R., Pandav A., Panebratsev Y., Pawlik B.,Pawlowska D., Pei H., Perkins C., Pinsky L., Pintér R. L., Pluta J., Porter J., Posik M.,Pruthi N. K., Przybycien M., Putschke J., Qiu H., Quintero A., Radhakrishnan S. K., Ramachandran S., Ray R. L.,Reed R., Ritter H. G., Roberts J. B., Rogachevskiy O. V., Romero J. L., Ruan L., Rusnak J., Sahoo N. R., Sako H., Salur S., Sandweiss J., Sato S., Schmidke W. B., Schmitz N., Schweid B. R., Seck F., Seger J., Sergeeva M., Seto R., Seyboth P., Shah N., Shahaliev E., Shanmuganathan P. V., Shao M., Shen F., Shen W. Q., Shi S. S., Shou Q. Y., Sichtermann E. P.,Sikora R., Simko M.,Singh J., Singha S., Smirnov N., Solyst W., Sorensen P., Spinka H. M., Srivastava B., Stanislaus T. D. S., Stefaniak M., Stewart D. J., Strikhanov M., Stringfellow B., Suaide A. A. P., Sumbera M.,Summa B., Sun X. M.,Sun Y., Surrow B., Svirida D. N., Szymanski P., Tang A. H.,Tang Z., Taranenko A., Tarnowsky T., Thomas J. H., Timmins A. R., Tlusty D., Tokarev M., Tomkiel C. A., Trentalange S., Tribble R. E., Tribedy P.,Tripathy S. K., Tsai O. D., Tu Z., Ullrich T., Underwood D. G., Upsal I.,Van Buren G., Vanek J., Vasiliev A. N., Vassiliev I., Videbæk F., Vokal S., Voloshin S. A., Wang F.,Wang G.,Wang J. S.,Wang P.,Wang Y.,Wang Z.,Webb J. C., Weidenkaff P. C., Wen L., Westfall G. D., Wieman H., Wissink S. W., Witt R., Wu Y., Xiao Z. G., Xie G.,Xie W., Xu H.,Xu N., Xu Q. H.,Xu Y. F.,Xu Y., Xu Z.,Yang C., Yang Q.,Yang S., Yang Y.,Yang Z., Ye Z., Yi L., Yip K., Zbroszczyk H., Zha W.,Zhang D.,Zhang S.,Zhang X. P.,Zhang Y.,Zhang Z. J.,Zhang Z.,Zhao J., Zhong C.,Zhou C.,Zhu X.,Zhu Z., Zurek M., Zyzak M.

arxiv（2020）

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摘要

In this letter, a comprehensive suite of jet substructure measurements via the SoftDrop algorithm, including the shared momentum fraction ($z_{\rm{g}}$) and the groomed jet radius ($R_{\rm{g}}$), are reported in \pp collisions at $\sqrt{s} = 200$ GeV collected by the STAR experiment. These substructure observables are differentially measured for jets of varying resolution parameters from $R = 0.2$ to $R = 0.6$ and transverse momentum range $15 < p_{\rm{T, jet}} < 60$ GeV$/c$. These studies show that, at RHIC kinematics with increasing jet resolution parameter and jet energy, the $z_{\rm{g}}$ distribution asymptotically converges to the DGLAP splitting kernel. The groomed jet radius measurements reflect a momentum-dependent narrowing of the jet structure for jets of a given resolution parameter, i.e., the larger the $p_{\rm{T, jet}}$, the narrower the first split. For the first time, these fully corrected measurements are compared to leading order Monte Carlo generators and to state-of-the-art theoretical calculations at next-to-leading-log accuracy. We observe that RHIC-tuned PYTHIA 6 is able to quantitatively reproduce data whereas the LHC-tuned event generators, PYTHIA 8 and HERWIG 7, are unable to provide a simultaneous description of both the $z_{\rm{g}}$ and $R_{\rm{g}}$, resulting in opportunities for fine parameter tuning of these models in \pp collisions at varying collision energies. We also find that the theoretical calculations without non-perturbative corrections are able to qualitatively describe the trend in data for jets of large resolution parameters at high $p_{\rm{T, jet}}$, but fail at small jet resolution parameters and low jet momenta.

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