Search for the QCD critical point in nuclear collisions at the CERN SPS

Pion production in nuclear collisions at the SPS is investigated with the aim to search, in a restricted domain of the phase diagram, for power-laws in the behavior of correlations which are compatible with critical QCD. We have analyzed interactions of nuclei of different size (p+p, C+C, Si+Si, Pb+Pb) at 158$A$ GeV adopting, as appropriate observables, scaled factorial moments in a search for intermittent fluctuations in transverse dimensions. The analysis is performed for $\pi^+\pi^-$ pairs with invariant mass very close to the two-pion threshold. In this sector one may capture critical fluctuations of the sigma component in a hadronic medium, even if the $\sigma$-meson has no well defined vacuum state. It turns out that for the Pb+Pb system the proposed analysis technique cannot be applied without entering the invariant mass region with strong Coulomb correlations. As a result the treatment becomes inconclusive in this case. Our results for the other systems indicate the presence of power-law fluctuations in the freeze-out state of Si+Si approaching in size the prediction of critical QCD.Comment: 31 pages, 11 figure

Isslyedovaniye sootnoshyeniya myezhdu probyegom i enyergiyei{cyrillic, short} v emul{cyrillic small soft sign}sii

An apparent variation of the mass of the Λ-hyperon with the energy of the decay π--meson has been observed in emulsion. This anomaly has been attributed to a systematic error in the range-energy relation for emulsion for particle velocities greater than 0.6 c. © 1970 Società Italiana di Fisica.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Physician Survey of the Effect of the 21-Gene Recurrence Score Assay Results on Treatment Recommendations for Patients With Lymph Node–Positive, Estrogen Receptor–Positive Breast Cancer

This physician survey looks at the effect of the 21-gene recurrence score assay results on adjuvant treatment recommendations for patients with lymph node–positive, estrogen receptor–positive breast cancer

The π+ mesonic decays of light hypernuclei

Twenty examples of π+ mesonic decays of light hypernuclei have been found together with 7000 π- mesonic decays. The ratio R4 of π+ mesonic decays for the gL4 He hypernucleus has been computed from the results of this work and those of a previous experiment [1] and is found to lie between the values 5.4 ± 1.5%1.7% and 6.9 ± 1.8%2.1%. The π+ mesonic decays of other species of hypernuclei are briefly discussed. © 1969.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

A determination of the binding-energy values of light hypernuclei

The results of an experimental study of the binding energies of light hypernuclei are presented, based on a sample of 2008 uniquely identified π- mesonic decays. The problems of the calibration procedure and the selection criteria are discussed. Various aspects of the Λ-N interaction are reviewed in the light of these new results. © 1968.SCOPUS: ar.jinfo:eu-repo/semantics/publishe