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Transverse spin-dependent azimuthal correlations of charged pion pairs measured in p + p collisions at s=500 GeV

Publication ,  Journal Article
Adamczyk, L; Adams, JR; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Ajitanand, NN; Alekseev, I; Anderson, DM; Aoyama, R; Aparin, A ...
Published in: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
May 10, 2018

The transversity distribution, which describes transversely polarized quarks in transversely polarized nucleons, is a fundamental component of the spin structure of the nucleon, and is only loosely constrained by global fits to existing semi-inclusive deep inelastic scattering (SIDIS) data. In transversely polarized p↑+p collisions it can be accessed using transverse polarization dependent fragmentation functions which give rise to azimuthal correlations between the polarization of the struck parton and the final state scalar mesons. This letter reports on spin dependent di-hadron correlations measured by the STAR experiment. The new dataset corresponds to 25 pb−1 integrated luminosity of p↑+p collisions at s=500 GeV, an increase of more than a factor of ten compared to our previous measurement at s=200 GeV. Non-zero asymmetries sensitive to transversity are observed at a Q2 of several hundred GeV and are found to be consistent with the former measurement and a model calculation. We expect that these data will enable an extraction of transversity with comparable precision to current SIDIS datasets but at much higher momentum transfers where subleading effects are suppressed.

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Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

ISSN

0370-2693

Publication Date

May 10, 2018

Volume

780

Start / End Page

332 / 339

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics
 

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Adamczyk, L., Adams, J. R., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., … Herrmann, N. (2018). Transverse spin-dependent azimuthal correlations of charged pion pairs measured in p + p collisions at s=500 GeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 780, 332–339. https://doi.org/10.1016/j.physletb.2018.02.069
Adamczyk, L., J. R. Adams, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, N. N. Ajitanand, et al. “Transverse spin-dependent azimuthal correlations of charged pion pairs measured in p + p collisions at s=500 GeV.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 780 (May 10, 2018): 332–39. https://doi.org/10.1016/j.physletb.2018.02.069.
Adamczyk L, Adams JR, Adkins JK, Agakishiev G, Aggarwal MM, Ahammed Z, et al. Transverse spin-dependent azimuthal correlations of charged pion pairs measured in p + p collisions at s=500 GeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2018 May 10;780:332–9.
Adamczyk, L., et al. “Transverse spin-dependent azimuthal correlations of charged pion pairs measured in p + p collisions at s=500 GeV.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 780, May 2018, pp. 332–39. Scopus, doi:10.1016/j.physletb.2018.02.069.
Adamczyk L, Adams JR, Adkins JK, Agakishiev G, Aggarwal MM, Ahammed Z, Ajitanand NN, Alekseev I, Anderson DM, Aoyama R, Aparin A, Arkhipkin D, Aschenauer EC, Ashraf MU, Attri A, Averichev GS, Bairathi V, Barish K, Behera A, Bellwied R, Bhasin A, Bhati AK, Bhattarai P, Bielcik J, Bielcikova J, Bland LC, Bordyuzhin IG, Bouchet J, Brandenburg JD, Brandin AV, Brown D, Bryslawskyj J, Bunzarov I, Butterworth J, Caines H, Calderón de la Barca Sánchez M, Campbell JM, Cebra D, Chakaberia I, Chaloupka P, Chang Z, Chankova-Bunzarova N, Chatterjee A, Chattopadhyay S, Chen JH, Chen X, Cheng J, Cherney M, Christie W, Contin G, Crawford HJ, Dedovich TG, Deng J, Deppner IM, Derevschikov AA, Didenko L, Dilks C, Dong X, Drachenberg JL, Draper JE, Dunlop JC, Efimov LG, Elsey N, Engelage J, Eppley G, Esha R, Esumi S, Evdokimov O, Ewigleben J, Eyser O, Fatemi R, Fazio S, Federic P, Federicova P, Fedorisin J, Feng Z, Filip P, Finch E, Fisyak Y, Flores CE, Fujita J, Fulek L, Gagliardi CA, Geurts F, Gibson A, Girard M, Grosnick D, Gunarathne DS, Guo Y, Gupta A, Guryn W, Hamad AI, Hamed A, Harlenderova A, Harris JW, He L, Heppelmann S, Herrmann N. Transverse spin-dependent azimuthal correlations of charged pion pairs measured in p + p collisions at s=500 GeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2018 May 10;780:332–339.
Journal cover image

Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

ISSN

0370-2693

Publication Date

May 10, 2018

Volume

780

Start / End Page

332 / 339

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics