Evidence for a narrow dip structure at 1.9 GeV/c2^2 in 3π+3π−3\pi^+ 3\pi^- diffractive photoproduction

A narrow dip structure has been observed at 1.9 GeV/c$^2$ in a study of diffractive photoproduction of the $~3\pi^+3\pi^-$ final state performed by the Fermilab experiment E687.Comment: The data of Figure 6 can be obtained by downloading the raw data file e687_6pi.txt. v5 (2nov2018): added Fig. 7, the 6 pion energy distribution as requested by a reade

Higgs Boson Studies at the Tevatron

We combine searches by the CDF and D0 Collaborations for the standard model Higgs boson with mass in the range 90--200 GeV$/c^2$ produced in the gluon-gluon fusion, $WH$, $ZH$, $t{\bar{t}}H$, and vector boson fusion processes, and decaying in the $H\rightarrow b{\bar{b}}$, $H\rightarrow W^+W^-$, $H\rightarrow ZZ$, $H\rightarrow\tau^+\tau^-$, and $H\rightarrow \gamma\gamma$ modes. The data correspond to integrated luminosities of up to 10 fb$^{-1}$ and were collected at the Fermilab Tevatron in $p{\bar{p}}$ collisions at $\sqrt{s}=1.96$ TeV. The searches are also interpreted in the context of fermiophobic and fourth generation models. We observe a significant excess of events in the mass range between 115 and 140 GeV/$c^2$. The local significance corresponds to 3.0 standard deviations at $m_H=125$ GeV/$c^2$, consistent with the mass of the Higgs boson observed at the LHC, and we expect a local significance of 1.9 standard deviations. We separately combine searches for $H \to b\bar{b}$, $H \to W^+W^-$, $H\rightarrow\tau^+\tau^-$, and $H\rightarrow\gamma\gamma$. The observed signal strengths in all channels are consistent with the presence of a standard model Higgs boson with a mass of 125 GeV/$c^2$

STUDY OF D(0)->K(S)0-PI+PI- AND D(0)->K(S)0K+K- IN HIGH-ENERGY PHOTOPRODUCTION

Analysis of the resonant and non-resonant branching fractions for the decays D0\u2192KS0\u3c0+\u3c0 12and D0\u2192KS0K+K 12 is presented. For the D0\u2192KS0\u3c0+\u3c0 12 decay, a fit to the observed Dalitz plot was performed to determine the complex amplitudes of the sub-component modes. For the D0\u2192KS0K+K 12 decay, measurements of the branching ratios D0\u2192KS0K+K 12 (inclusive), D0\u2192KS0\u3c6, and D0\u2192KS0(K+K 12)non-\u3c6 relative to the D0\u2192KS0\u3c0+\u3c0 12 mode are reported. The data were collected by the Fermilab high energy photoproduction experiment E687

Study of D0 \u2192 K 12\u3bc+\u3bd in high energy photoproduction

We report a measurement of the semimuonic decay D0\u2192K 12\u3bc+\u3bd from data taken during the 1987\u20131988 fixed target run at Fermilab by the E687 Collaboration. We obtain \u393(D0\u2192K 12\u3bc+\u3bd)/\u393(D0\u2192K 12\u3c0+)=0.82\ub10.13\ub10.13 and use this result to calculate \u393(D0\u2192K 17 12\u3bc+\u3bd)/\u393(D0\u2192K 12\u3bc+\u3bd)=0.59\ub10.10\ub10.1

Search for the decay of D+ and Ds+ mesons to three charged kaons

We report the results of a search for the doubly Cabibbo suppressed decays D+ \u2192 K+K 12K+ and D+ \u2192 phi K+, and the singly Cabibbo suppressed decays Ds+ \u2192 K+K 12K+ and Ds+ \u2192 phi K+. Our measurements are all consistent with zero branching ratio, and we set 90% confidence level upper limits on the relative D+ branching ratios: BR(phi K+)/BR(phi pi+) < 0.021, BR(K+K-K+)/BR(phi pi+) < 0.025, and BR(K+K-K+)/BR(K-pi+pi+) < 0.0016, and the relative Ds+ branching ratios: BR(phi K+) / BR(phi pi+) < 0.013 and BR(K+K-K+)/BR(phi pi+) < 0.016. The data were accumulated by the Fermilab high energy photoproduction experiment E687

1ST EVIDENCE OF OMEGA-C(0)- > OMEGA- PI+

We report evidence of a narrow resonance at a mass of 2705.9 \ub1 3.3 \ub1 2.0 MeV/c2 in the final state Omega 12\u3c0+ and the charge conjugate. The mass and width support the interpretation of a weakly decaying doubly strange charmed baryon, the Omegac0. Limits on the relative branching ratios for Omegac0\u2192Omega 12K 12\u3c0+\u3c0+ and Omegac0\u2192Omega- pi 12pi+pi+ are also presented

A MEASUREMENT OF GAMMA(DS+->PHI MU+NU) / GAMMA(DS+->PHI-PI+).

Fermilab high-energy photoproduction experiment E687 measures a branching ratio of Gamma (DS+ \u2192 phi mu+nu) /Gamma (DS+ \u2192 phi mu+) = 0.58 \ub1 0.17 (stat) \ub1 0.07 (sys). This branching ratio is combined with theoretical inputs to obtain a new measurement of the DS+ absolute branching ratio of Gamma (DS+ \u2192 phi mu+) / Gamma(DS+ \u2192 all) = 0.031 \ub1 0.009 (stat 0.005 (sys) \ub1 0.004 (theoretical)