Measurement of charm and bottom production from semileptonic hadron decays in p+p collisions at s=200  GeV

C A Aidala ,L Zou,G Tarnai,M Mccumber,N Grau,Y Goto,R Petti,A Franz,R Nishitani,A Durum,J Klatsky,J Bryslawskyj,G David,D Richford,A Pun,H Ge,J Sziklai,N Novitzky,D Lynch,K Nakano,M Virius,A Berdnikov,Y Berdnikov,S Esumi,S Tarafdar,N Feege,D Jouan,C Mckinney,K Deblasio,T Majoros,A Deshpande,A Bazilevsky,W Peng,A Sexton,A Timilsina,M Patel,R Cervantes,D Ivanishchev,B Kurgyis,T Hoshino,Y Fukuda,D Isenhower,A Sukhanov,S Bathe,M Mendoza,P Montuenga,M Sarsour,A Taranenko,V Babintsev,S Karthas,Y Ueda,K Imai,E Kistenev,Z Rowan,D Kotov,L Xue,K Sedgwick,A Iordanova,M Jezghani,Y Riabov,V Papavassiliou,A Denisov,J Murata,C Gal,R Seidl,N Vukman,A Lebedev,M Chiu,B Fadem,R Seto,B Azmoun,A Hodges,M Slunečka,M Rosati,T Sumita,V Canoa Roman,T Hachiya,N Cronin,T Koblesky,M Beaumier,I Shein,M Grosse Perdekamp,J Runchey,S Zharko,A Dion,A Yanovich,I Nakagawa,T Moon,A Drees,I Tserruya,G Mitsuka,T Murakami,D Kincses,R Belmont,N Hotvedt,S Mizuno,T Todoroki,J Hanks,K Kurita,K Tanida,D Kapukchyan,A Enokizono,Y Akiba,T Niida,V Andrieux,D Kawall,V Bumazhnov,S Nelson,C Pinkenburg,M Tomášek,K Dehmelt,E A Gamez ,T Gunji,Jeongsu Bok ,J Choi ,R Nouicer,P W Stankus ,A Öskarsson ,M Snowball,J S Haggerty ,M Daugherity ,C A Ogilvie ,S Greene ,A Safonov ,V Riabov,B Hong,J H Kang ,V Manko ,D P Morrison ,A C Mignerey ,J H ,X R Wang ,B Schaefer,K F Read ,Sanghoon Lim ,I E Yushmanov ,M J Leitch ,P Gallus,M I Nagy ,D K Mishra ,I J Choi ,P Garg,A M Sickles ,W J Metzger ,D Sharma,V.-R Loggins,Q J Xu ,N S Bandara ,C P Singh ,S I Morrow ,R Tieulent,T Sakaguchi,R S Towell ,X Li,M L Brooks ,C Nattrass,V K Singh ,S Yalcin,X Q He ,H En’Yo,A D Frawley ,C L Woody ,J E Frantz ,J S Park ,J D Osborn ,S Lee,Susumu Sato ,Y I Makdisi ,T O S Haseler ,B M Johnson ,S Campbell,J Huang,W A Zajc ,S Park,J Yoo ,D Silvermyr,S Huang,J Perry,N A Lewis ,C Y ,E J Desmond ,Z Ji,Y Zhai,D Reynolds,M J Tannenbaum ,M Shimomura,H F Hamilton ,T Sugitate,P V Radzevich ,K Nagashima,J D Orjuela Koop ,M Kim,J L Nagle ,B Jacak ,B K Singh ,Y Yamaguchi ,S Sörensen ,T Novák,T Shioya,P L Mcgaughey ,D Mcglinchey,Z Wang,J Velkovska,C L Silva ,Y H Leung ,R S Hollis ,T Csörgõ ,A Nyanin ,S Lökòs ,B Ujvári ,V Samsonov,K Homma,Z Sun,Yu M Mitrankov ,D E Fields ,Y Kwon,M Makek,M J Skoby ,D V Perepelitsa ,W Fan,A Milov,A V Kazantsev ,D S Jumper ,R A Soltz ,S Suzuki,W E Sondheim ,S D Rolnick ,М Фингер ,G J Ottino ,S Fokin ,K Lovász ,P Kline,M Inaba,M W Phipps ,K I Hahn ,G D N Perera ,J Sun,C P Wong ,C Scarlett ,S Han ,K Shigaki,S Ishimaru,Hiroshi Yamamoto ,X Jiang,M Csanád,M L Purschke ,J T Mitchell ,S F Pate ,C Kim,T K Hemmick ,M Connors,C L Towell ,D Yu Peressounko ,H Guragain,H Yu,V Pantuev,C J Xu ,Timothy Thomas Rinn ,I Yoon,E.-J Kim,S Miyasaka,Y Watanabe ,A Sen,A Khanzadeev,T Nagashima,S Hasegawa,T A Shibata ,H Asano,J C Hill ,H Sako,K Nagai,K N Barish ,K K Hill ,J M Durham ,S Kudo,V Vrba,B K Schmoll ,E O’Brien,H Hamagaki,A Zelenski,M Alfred,S H Lee ,F Giordano,N Apadula,P Shukla,H W Van Hecke ,T W Danley ,S P Stoll ,Dhruv Utpalkumar Dixit ,K A Drees ,J G Lajoie ,C E Perezlara ,E Mannel,K Smith ,D Blau ,Z H Citron ,M X Liu ,V Khachatryan,K Ozawa,R P Pisani ,I V Sourikova

doi:10.1103/physrevd.99.092003

Abstract

Measurements of the differential production of electrons from open-heavy-flavor hadrons with charm- and bottom-quark content in $p$$+$$p$ collisions at $\sqrt{s}=200$ GeV are presented. The measurements proceed through displaced-vertex analyses of electron tracks from the semileptonic decay of charm and bottom hadrons using the PHENIX silicon-vertex detector. The relative contribution of electrons from bottom decays to inclusive heavy-flavor-electron production is found to be consistent with fixed-order-plus-next-to-leading-log perturbative-QCD calculations within experimental and theoretical uncertainties. These new measurements in $p$$+$$p$ collisions provide a precision baseline for comparable forthcoming measurements in A$+$A collisions.

Highlights

Charm and bottom quarks are collectively referred to as heavy-flavor quarks. Their production in elementary p þ p collisions is of interest from a variety of vantage points, both in high-energy particle and nuclear physics
The most advanced analytic perturbative quantum chromodynamics (pQCD) techniques currently available allow for such divergences to be resummed, giving rise to the fixed-order-plus-next-toleading-log (FONLL) approach [3]
Like other heavy-flavor measurements at Relativistic Heavy Ion Collider (RHIC), the results presented are higher than the FONLL calculation

Summary

Introduction

Unlike light quarks the large masses of heavy-flavor quarks (compare mc ≈ 1280 MeV=c2 and mb ≈ 4180 MeV=c2 with mu ≈ 2.2 MeV=c2 and md ≈ 4.7 MeV=c2) [1] are such that their production can be calculated using perturbative quantum chromodynamics (pQCD) even at low pT. At next-to-leading order (NLO), processes such as flavor excitation and gluon splitting are involved. In this regime, divergences are regulated by the mass of the heavy quarks, which acts as an infrared cutoff except when the quark pT is greater than its mass [2]. The most significant contribution comes from the background electron cocktail and its normalization, supplying an approximate 10% uncertainty at low pT. The total systematic uncertainty is obtained by adding the contributions of every source in quadrature.

Methods

Results

Conclusion