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Observation of Feynman scaling violations and evidence for a new resonance at RHIC

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arxiv 1909.03124 v1 pith:MZSSEAMT submitted 2019-09-06 nucl-ex

Observation of Feynman scaling violations and evidence for a new resonance at RHIC

L. C. Bland , E. J. Brash , H. J. Crawford , A.A. Derevschikov , K. A. Drees , J. Engelage , C. Folz , E. G. Judd
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X. Li N. G. Minaev R. N. Munroe L. Nogach A. Ogawa C. Perkins M. Planinic A. Quintero G. Schnell P. V. Shanmuganathan G. Simatovic B. Surrow T. G. Throwe A. N. Vasiliev
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We report measurements of forward jets and dijets produced in Cu+Au collisions at $\sqrt{s_{NN}}=200$ GeV at the Relativistic Heavy Ion Collider. We also report dijet production cross sections in p+p collisions at $\sqrt{s}=510$ GeV. We use the invariant dijet mass to search for indications of new particles. The p+p dijet results are compatible with string fragmentation models tuned to fit LHC data. The Cu+Au jet results far exceed Feynman scaling limits, and are compatible with models that incorporate string fusion to increase parton energy, acting as a QCD accelerator. The Cu+Au dijet results can be mostly explained by double parton scattering due to a parton flux from multiple p+p interactions with $\sqrt{s}>>\sqrt{s_{NN}}$. Further indication of the increased parton energy is obtained from evidence of single- and double-$\Upsilon$(1S) production in the forward direction in Cu+Au collisions. Finally, we report evidence for the production of a new resonance, reconstructed from its dijet decay.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. All-charm tetraquarks at hadron colliders: A high-precision fragmentation perspective

    hep-ph 2026-04 accept novelty 5.5

    TQ4Q2.0 supplies the first complete, uncertainty-quantified set of NRQCD-based fragmentation functions for all-heavy tetraquarks, including nonconstituent channels and public grids for jet-associated production.

  2. All-charm tetraquarks at hadron colliders: A high-precision fragmentation perspective

    hep-ph 2026-04 unverdicted novelty 5.0

    The authors construct and publicly release the TQ4Q2.0 fragmentation functions for all-heavy S-wave tetraquarks via NRQCD factorization, extending prior work with nonconstituent contributions and replica-based uncertainties.

  3. Investigation of fully heavy tetraquark within chiral quark model

    hep-ph 2026-06 unverdicted novelty 4.0

    Chiral quark model calculations find resonance states in ccar{c}ar{c} at ~7002 MeV (width 54 MeV) and ~7227 MeV (width 66 MeV) as X(6900) and X(7200) candidates, plus one bbar{b}ar{b} resonance at ~19743 MeV (widt...

  4. Investigation of fully heavy tetraquark within chiral quark model

    hep-ph 2026-06 conditional novelty 4.0

    A chiral quark model calculation finds two 2++ fully charmed tetraquark resonances near 7002 and 7227 MeV, candidate explanations for X(6900) and X(7200), plus a bottomed counterpart near 19743 MeV.