Observation of a Narrow Near-Threshold Structure in the $J/\psi\phi$ Mass Spectrum in $B^+\to J/\psi\phi K^+$ Decays PDF Download
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Languages : en
Pages : 4
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Observation is reported for a structure near the J/[psi][phi] threshold in B+ → J/[psi][phi]K+ decays produced in {bar p}p collisions at √s = 1.96 TeV with a statistical significance of beyond 5 standard deviations. There are 19 ± 6 events observed for this structure at a mass of 4143.4{sub -3.0}{sup +2.9}(stat) ± 0.6(syst) MeV/c2 and a width of 15.3{sub -6.1}{sup +10.4}(stat) ± 2.5(syst) MeV/c2, which are consistent with the previous measurements reported as evidence of the Y(4140).
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Languages : en
Pages : 4
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Observation is reported for a structure near the J/[psi][phi] threshold in B+ → J/[psi][phi]K+ decays produced in {bar p}p collisions at √s = 1.96 TeV with a statistical significance of beyond 5 standard deviations. There are 19 ± 6 events observed for this structure at a mass of 4143.4{sub -3.0}{sup +2.9}(stat) ± 0.6(syst) MeV/c2 and a width of 15.3{sub -6.1}{sup +10.4}(stat) ± 2.5(syst) MeV/c2, which are consistent with the previous measurements reported as evidence of the Y(4140).
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Languages : en
Pages : 7
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Evidence is reported for a narrow structure near the J/[psi][phi] threshold in exclusive B+ → J/[psi][phi]K+ decays produced in {bar p}p collisions at √s = 1.96 TeV. A signal of 14 ± 5 events, with statistical significance in excess of 3.8 standard deviations, is observed in a data sample corresponding to an integrated luminosity of 2.7 fb−1, collected by the CDF II detector. The mass and natural width of the structure are measured to be 4143.0 ± 2.9(stat) ± 1.2(syst) MeV/c2 and 11.7{sub -5.0}{sup +8.3}(stat) ± 3.7(syst) MeV/c2.
![Observation of the Three-body Rare Decay B-] J/psi Phi K. PDF](https://books.google.com/books/content/images/frontcover/mv-snQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 19
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The authors report the study of the B meson decays B{sup ±} 2!J/[psi][phi]K{sup ±}, B° 2!J/[psi][phi]K° using 433 million of B{bar B} events collected at the [Upsilon](4S) resonance with the BABAR detector at the PEP-II ee− asymmetric-energy collider. They obtain the branching fraction measurements: [Beta](B{sup ±} 2!J[psi][phi]K{sup ±}) = (5.6 {+-} 0.9(stat) {+-} 0.3(sys)) x 10−5, [Beta](B{sup {+-}} 2!J[psi][phi]K°) = (5.4 {+-} 1.2(stat) {+-} 0.4(sys)) x 10−5.
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Languages : en
Pages : 7
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The authors report the results of a study of the decays B 2!J/[psi][omega]K and B° 2!J/[psi][omega]K{sub S}° using 383 million B{bar B} events from [Upsilon](4S) decays with the BABAR detector at the PEP-II asymmetric-energy e+e− storage rings. They observe evidence for Y(3940) 2!J/[psi][omega] with product branching fractions [Beta](B+ 2!Y K+, Y 2!J/[psi][omega]) = (4.9 ± 1.0(stat) ± 0.5(syst)) x 10−5 and [Beta](B° 2!Y K°, Y 2!J/[psi][omega]) = (1.5{sub -1.2}{sup +1.4}(stat){sub -0.2}{sup +0.2}(syst)) x 10−5. The measured mass and width are M(Y) = (3914.6{sub -3.4}{sup +3.8}(stat){sub -1.9}{sup +1.9}(syst)) MeV/c2 and [Lambda](Y) = (33−{sup +12}(stat)−5{sup +5}(syst)) MeV, respectively.
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Languages : en
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The authors report the first observation of two Cabibbo-suppressed decay modes of the B{sub s}° meson. Using a sample of p{bar p} collisions at √s = 1.96 TeV corresponding to 5.9 fb−1 of integrated luminosity collected with the CDF II detector at the Fermilab Tevatron, they search for new B{sub s}° decay modes in a sample of events containing J/? →??− decays. They reconstruct a B{sub s}° → J/? K*(892)° signal with K*(892)° → K+?−, observing a yield of 151 ± 25 events with a statistical significance of 8.0?. They also reconstruct a B{sub s}° → J/? K{sub S}° signal with K{sub S}° →?+?−, observing a yield of 64 ± 14 events with a statistical significance of 7.2?. From these yields, they extract the branching ratios?(B{sub s}° → J/? K*(892)°) = (8.3 ± 3.8) x 10−5 and?(B{sub s}° → J/? K°) = (3.5 ± 0.8) x 10−5, where statistical, systematic, and fragmentation-fraction uncertainties are included in the combined uncertainty.
![Observation of the Decay B+-(c) ---] J/psi Pi+- and Measurement of the B+-(c) Mass PDF](https://books.google.com/books/content/images/frontcover/Ux9pAQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 7
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The B{sub c}{sup ±} meson is observed through the decay B{sub c}{sup ±} → J/[psi] [pi]{sup ±}, in data corresponding to an integrated luminosity of 2.4 fb−1 recorded by the CDF II detector at the Fermilab Tevatron. A signal of 108 {+-} 15 candidates is observed, with a significance that exceeds 8[sigma]. The mass of the B{sub c}{sup {+-}} meson is measured to be 6275.6 {+-} 2.9(stat.) {+-} 2.5(syst.) MeV/c2.
![Measurement of the Dipion Mass Spectrum in the Decay X(3872) -] J/psi Pi+ Pi- at the CDF II Experiment PDF](https://books.google.com/books/content/images/frontcover/cwQBDQEACAAJ?fife=w80-h100)
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The authors present a measurement of the dipion mass spectrum in the decay X(3872) [yields] J/[psi][pi][sup +][pi][sup -] using a 360 pb[sup -1] sample of p[bar p] collisions at [radical]s = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron Collider. As a benchmark, they also extract the dipion mass distribution for [psi](2S) [yields] J/[psi][pi][sup +][pi][sup -] decay. The X(3872) dipion mass spectrum is compared to QCD multipole expansion predictions for various charmonium states, as well as to the hypothesis X(3872) [yields] J/[psi]p[sup 0]. They find that the measured spectrum is compatible with [sup 3]S[sub 1] charmonium decaying to J/[psi][pi][sup +][pi][sup -] and with the X(3872) [yields] J/[psi]p[sup 0] hypothesis. There is, however, no [sup 3]S[sub 1] charmonium state available for assignment to the X(3872). The multipole expansion calculations for [sup 1]P[sub 1] and [sup 3]D[sub J] states are in clear disagreement with the X(3872) data. For the [psi](2S) the data agrees well with previously published results and to multipole expansion calculations for [sup 3]S[sub 1] charmonium. Other, non-charmonium, models for the X(3872) are described too. The authors conclude that since the dipion mass spectrum for X(3872) is compatible with J/[psi]p[sup 0] hypothesis, the X(3872) should be C-positive. This conclusion is supported by recent results from Belle Collaboration which observed X(3872) [yields] J/[psi][gamma] decay. They argue that if X(3872) is a charmonium, then it should be either 1[sup 1]D[sub 2-+] or 2[sup 3]P[sub 1++] state, decaying into J/[psi][pi][sup +][pi][sup -] in violation of isospin conservation. A non-charmonium assignment, such as D[bar D]* molecule, is also quite possible.
![Measurement of the Dipion Mass Spectrum in the Decay X(3872) [right Arrow] J/ [psi] [pi]+ [pi]− at the CDFII Experiment PDF](https://books.google.com/books/content/images/frontcover/lEY9ywAACAAJ?fife=w80-h100)
Author: Alexander Yurevich Rakitin
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Languages : en
Pages : 384
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We present a measurement of the dipion mass spectrum in the decay X(3872) [right arrow] J/ [psi] [pi]+ [pi]− using a 360 pb-1 sample of pp collisions at av [square root]s = 1.96 TeV collected with the CDF II detector at the Fermnilab Tevatron Collider. As a benchmark, we also extract the dipion mass distribution for [psi] (2s) [right arrow] J/ [psi] [pi]+ [pi]− decay. The X(3872) dipion mass spectrum is compared to QCD multipole expansion predictions for various charmonium states, as well as to the hypothesis [right arrow] J/ [psi] po. We find that the measured spectrum is compatible with 3S1 charmonium decaying to J/ [psi] [pi]+ [pi]− - and with the X(3872) - J/po hypothesis. There is, however, no 3S1 charmonium state available for assignment to the X(3872). The multipole expansion calculations for 1P1 and 3DJ states are in clear disagreement with the X(3872) data. For the [psi] (2S) the data agrees well with previously published results and to multipole expansion calculations for 3S1 charmonium. Other, non-charmonium, models for the X(3872) are described too. We conclude that since the dipion mass spectrum for X(3872) is compatible with J/pO hypothesis, the X(3872) should be C-positive. This conclusion is supported by recent results from Belle Collaboration which observed X(3872) -+ J/7y decay. We argue that if X(3872) is a charmonium, then it should be either ... state, decaying into J/ [psi] [pi]+ [pi]− in violation of isospin conservation. A non-charmonium assignment, such as DD* molecule, is also quite possible.
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![Measurement of the Dipion Mass Spectrum in X(3872) ---] J/psi Pi+ Pi- Decays PDF](https://books.google.com/books/content/images/frontcover/6g3rwQEACAAJ?fife=w80-h100)
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Languages : en
Pages : 7
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The authors measure the dipion mass spectrum in X(3872) → J/???− decays using 360 pb−1 of {bar p}p collisions at √s = 1.96 TeV collected with the CDF II detector. The spectrum is fit with predictions for odd C-parity (3S1, 1P1, and 3D{sub J}) charmonia decaying to J/??+?−, as well as event C-parity states in which the pions are from?° decay. The latter case also encompasses exotic interpretations, such as a D°{bar D}*° molecule. Only the 3S1 and J/?? hypotheses are compatible with the data. Since 3S1 is untenable on other grounds, decay via J/?? is favored, which implies C = +1 for the X(3872). Models for different J/?-? angular momenta L are considered. Flexibility in the models, especially the introduction of?-? interference, enable good descriptions of the data for both L = 0 and 1.
