HEPData Search

Showing 10 of 162 results

Open charm yields in d + Au collisions at s(NN)**(1/2) = 200-GeV.

The STAR collaboration Adams, J. ; Aggarwal, M.M. ; Ahammed, Z. ; et al.

Phys.Rev.Lett. 94 (2005) 062301, 2005.

Inspire Record 653868 DOI 10.17182/hepdata.43117

Mid-rapidity open charm spectra from direct reconstruction of $D^{0}$($\bar{D^0}$)$\to K^{\mp}\pi^{\pm}$ in d+Au collisions and indirect electron/positron measurements via charm semileptonic decays in p+p and d+Au collisions at \srt = 200 GeV are reported. The $D^{0}$($\bar{D^0}$) spectrum covers a transverse momentum ($p_T$) range of 0.1 $<p_T<$ 3 \GeVc whereas the electron spectra cover a range of 1 $<p_T<$ 4 GeV/$c$. The electron spectra show approximate binary collision scaling between p+p and d+Au collisions. From these two independent analyses, the differential cross section per nucleon-nucleon binary interaction at mid-rapidity for open charm production from d+Au collisions at RHIC is $d\sigma^{NN}_{c\bar{c}}/dy$=0.30$\pm$0.04 (stat.)$\pm$0.09(syst.) mb. The results are compared to theoretical calculations. Implications for charmoniumm results in A+A collisions are discussed.

8 data tables match query

Table 1

Inclusive electrons yield versus transverse momentum in D+AU collisions Data points at PT = 2.2, 2.7 and 3.5 GeV/c was obtained using only the TPC (Time Projection Chamber) and cover a pseudo-rapidity range of -1<eta<1, while other points were obtained using both a prototypeTime-of-Flight System and the TPC and cover a pseudo-rapidity range of -1<eta<0.

Table 2

Inclusive electrons yield versus transverse momentum in P+P collisions.

Table 3

D0 yield versus transverse momentum in D+AU collisions.

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Comparison of Spin Asymmetries and Cross Sections in $\pi^0$ Production by 200 GeV Polarized Antiprotons and Protons

The E581 & E704 collaborations Adams, D.L. ; Akchurin, N. ; Belikov, N.I. ; et al.

Phys.Lett.B 261 (1991) 201-206, 1991.

Inspire Record 314232 DOI 10.17182/hepdata.29396

None

4 data tables match query

Table 1

No description provided.

Table 2

P P data are taken from Adams et al, Fermilab-Pub-91/13-E.

Table 3

Ratio of the spin averaged invariant cross section for PI0 production in p p and pbar p interactions.

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K*(892)0 production in relativistic heavy ion collisions at S(NN)**(1/2) = 130-GeV.

The STAR collaboration Adler, C. ; Ahammed, Z. ; Allgower, C. ; et al.

Phys.Rev.C 66 (2002) 061901, 2002.

Inspire Record 587235 DOI 10.17182/hepdata.54898

We report the first observation of $K^{\star}(892)^{0}\to\pi K$ in relativistic heavy ion collisions. The transverse momentum spectrum of $(K^{\star0}+\bar{K}^{\star0})/2$ from central Au+Au collisions at $\sqrt{s_{_{NN}}}=130$ GeV is presented. The ratios of the $K^{\star0}$ yield derived from these data to the yields of negative hadrons, charged kaons, and $\phi$ mesons have been measured in central and minimum bias collisions and compared with model predictions and comparable $e^{+}e^{-}$, $pp$, and $\bar{p}p$ results. The data indicate no dramatic reduction of $K^{\star0}$ production in relativistic heavy ion collisions despite expected losses due to rescattering effects.

4 data tables match query

Table 1

Transverse mass spectrum of K*0 with YRAP = -0.5 to 0.5 for the 14 PCT most central interactions. Numerical values requested from the authors.

Table 2

K*0 to negative hadron ratio using hadron data from Adler et al PRL 87,112303(2001).

Table 3

K*0 to kaon ratio using STAR kaon data.

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pi- Meson Elastic Scattering on Proton in the Coulomb-Nuclear Interference Region for Momentum Range from 33-GeV/c Up to 60-GeV/c

Apokin, V.D. ; Vasiliev, A.N. ; Derevshchikov, A.A. ; et al.

Sov.J.Nucl.Phys. 24 (1976) 49, 1976.

Inspire Record 99591 DOI 10.17182/hepdata.35863

None

10 data tables match query

Table 1

No description provided.

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ON INVESTIGATING ENERGY DEPENDENCE OF CROSS-SECTION FOR pi- MESON ELASTIC SCATTERING ON PROTONS IN THE INTERVAL 33-GeV/c TO 55-GeV/c

Derevshchikov, A.A. ; Matulenko, Yu.A. ; Meshchanin, A.P. ; et al.

Nucl.Phys.B 80 (1974) 442-460, 1974.

Inspire Record 80729 DOI 10.17182/hepdata.32174

The π − p differential elastic scattering cross sections have been measured for eight momenta in the 33–55 GeV/ c range. The energy dependence of the slope and of the total elastic scattering cross sections has been determined experimentally. The results are compared with the known data. The experimental data are compared both with the Regge pole model and with the quasi-potential one.

9 data tables match query

Table 1

No description provided.

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Measurement of the differences in the total cross section for antiparallel and parallel longitudinal spins and a measurement of parity nonconservation with incident polarized protons and antiprotons at 200-GeV/c.

The E581/704 collaboration Grosnick, D.P. ; Hill, D.A. ; Kasprzyk, T. ; et al.

Phys.Rev.D 55 (1997) 1159-1187, 1997.

Inspire Record 420534 DOI 10.17182/hepdata.22329

The highest-energy measurement of ΔσL(pp) and the first ever measurement of ΔσL(p¯p), the differences between proton-proton and antiproton-proton total cross sections for pure longitudinal spin states, are described. Data were taken using 200-GeV/c polarized beams incident on a polarized-proton target. The results are measured to be ΔσL(pp)=−42±48(stat)±53(syst) μb and ΔσL(p¯p)=−256±124(stat)±109(syst) μb. Many tests of systematic effects were investigated and are described, and a comparison to theoretical predictions is also given. Measurements of parity nonconservation at 200 GeV/c in proton scattering and the first ever of antiproton scattering have also been derived from these data. The values are consistent with zero at the 10−5 level.

2 data tables match query

Table 1

No description provided.

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No description provided.

Measurement of D* Mesons in Jets from p+p Collisions at sqrt{s} = 200 GeV

The STAR collaboration Abelev, B.I. ; Aggarwal, M.M. ; Ahammed, Z. ; et al.

Phys.Rev.D 79 (2009) 112006, 2009.

Inspire Record 810426 DOI 10.17182/hepdata.45861

We report the measurement of charged $D^*$ mesons in inclusive jets produced in proton-proton collisions at a center of mass energy $\sqrt{s}$ = 200 GeV with the STAR experiment at RHIC. For $D^{*}$ mesons with fractional momenta $0.2 < z < 0.5$ in inclusive jets with 11.5 GeV mean transverse energy, the production rate is found to be $N(D^{*+}+D^{*-})/N(\mathrm{jet}) = 0.015 \pm 0.008 (\mathrm{stat}) \pm 0.007 (\mathrm{sys})$. This rate is consistent with perturbative QCD evaluation of gluon splitting into a pair of charm quarks and subsequent hadronization.

2 data tables match query

Table 1

D*+-/jet azimuthal correlations. Delta Phi represents the difference in azimuthal angle between D*+- (of 2<Pt<10 GeV/c) and the jet's (of 8<Pt<20 GeV/c) axis.

Table 2

Production rate of D*+- mesons with fractional longitudinal momenta 0.2<z<0.5 (z = Pl(D*+-)/Ejet, Pl is the momentum projection on the jet axis and Ejet is the total jet energy) in inclusive jets of 11.5 Gev mean transverse energy.