Measurement of Anti-Deuteron Photoproduction and a Search for Heavy Stable Charged Particles at HERA

Abstract

The cross section for anti-deuteron photoproduction is measured at HERA at a mean centre-of-mass energy of W_{γp} = 200 GeV in the range 0.2 < p_T/M < 0.7 and |y| < 0.4, where M, p_T and y are the mass, transverse momentum and rapidity in the laboratory frame of the anti-deuteron, respectively. The numbers of anti-deuterons per event are found to be similar in photoproduction to those in central proton-proton collisions at the CERN ISR but much lower than those in central Au-Au collisions at RHIC. The coalescence parameter B_2, which characterizes the likelihood of anti-deuteron production, is measured in photoproduction to be 0.010 \pm 0.002 \pm 0.001, which is much higher than in Au-Au collisions at a similar nucleon-nucleon centre-of-mass energy. No significant production of particles heavier than deuterons is observed and upper limits are set on the photoproduction cross sections for such particles.

24 pages, 7 figures and 3 tables

References in corpus (2)

• Next-to-next-to-leading order soft-gluon corrections in top quark hadroproduction
• A unified approach to NNLO soft and virtual corrections in electroweak, Higgs, QCD, and SUSY processes

Cited by in corpus (20)

• Searches for long-lived charged particles in pp collisions at sqrt(s) = 7 and 8 TeV
• Single top quark production at the Tevatron: threshold resummation and finite-order soft gluon corrections
• Cold Nuclear Matter Effects on J/psi and Upsilon Production at the LHC
• Search for long-lived charged particles in proton-proton collisions at sqrt(s) = 13 TeV
• Narrowing the uncertainty on the total charm cross section and its effect on the J/ψ cross section
• Search for heavy long-lived charged particles in pp collisions at sqrt(s) = 7 TeV
• The total charm cross section
• Next-to-next-to-next-to-leading-order soft-gluon corrections in hard-scattering processes near threshold
• Joint resummation for heavy quark production
• Theoretical status of the top quark cross section
• Strangeness Enhancement: Challenges and Successes
• Improved Measurement of the b-bbar Production Cross Section in 920 GeV Fixed-Target Proton-Nucleus Collisions
• Open and Hidden Charm Production at RHIC and LHC
• Heavy-Flavor Production at Accelerators
• Bottom production cross section from double muonic decays of b-hadrons in 920 GeV proton-nucleus collision
• Strangeness enhancement at LHC
• Search for heavy long-lived charged particles with large ionization energy loss in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Parton Model Calculation of Inclusive Charm Production by a Low-energy Antiproton Beam
• The implications of final L3 measurement of $σ_{tot}(γγ\to b\bar{b}
• Open and Hidden Charm Production in d$A$ Collisions at RHIC and LHC