| 词条 | Y(4140) |
| 释义 |
The Y(4140) particle is an electrically neutral exotic hadron candidate that is about 4.4 times heavier than the proton. It was observed at Fermilab and announced on 17 March 2009.[1] This particle is extremely rare and was detected in only 20 of billions of collisions.[2] Since it decays into J/ψ and φ mesons, it has been suggested that this particle is composed of charm quarks and charm antiquarks, possibly even a four quark combination.[3] The existence of the particle has been confirmed by members of the CMS collaboration at the Large Hadron Collider on November 14, 2012[4][5] and by the DØ experiment at the Tevatron on September 25, 2013.[6][7] The Belle experiment[8] has searched for this particle but found no evidence for its existence. The LHCb experiment observes a peak at the same position in the J/ψϕ invariant mass, but it is best described as a Ds±Ds∗∓ cusp, and is much broader than the previous measurements of the Y(4140).[9][10] The Particle Data Group has renamed Y(4140) to follow naming conventions to X(4140). See also
References1. ^{{cite web |date=19 March 2009 |title=Oddball Particle Surprises Physicists at Fermilab |url=http://www.redorbit.com/news/science/1657139/oddball_particle_surprises_physicists_at_fermilab/index.html |publisher=redOrbit |accessdate=2009-03-21}} 2. ^{{cite web |last=Handwerk |first=Brian |date=20 March 2009 |title=Strange Particle Created; May Rewrite How Matter's Made |url=http://news.nationalgeographic.com/news/2009/03/090320-new-particle.html |work=National Geographic News |accessdate=2009-03-21}} 3. ^{{cite web | last = Minard | first = Anne | date = 18 March 2009 | title = New Particle Throws Monkeywrench in Particle Physics | url = http://www.universetoday.com/2009/03/18/new-particle-throws-monkeywrench-in-particle-physics/ | work = Universe Today}} 4. ^Riesselmann, Kurt (December 4, 2012). "Experiment confirms existence of odd particle". Phys.Org. 5. ^{{Cite journal|arxiv = 1211.7004|last1 = Hidalgo-Duque|first1 = C|title = Heavy Quark Spin Symmetry and SU(3)-Flavour Partners of the X(3872)|journal = Nuclear Physics A|volume = 914|pages = 482–487|last2 = Nieves|first2 = J|last3 = Pavón Valderrama|first3 = M|year = 2012|doi = 10.1016/j.nuclphysa.2013.01.025|bibcode = 2013NuPhA.914..482H}} 6. ^Dorigo, Tommaso (September 26, 2013). "DZERO Confirms The Y(4140) And Its Excitation" 7. ^{{Cite journal|arxiv = 1309.6580|author1=D0 Collaboration|last2 = Abbott|first2 = B|last3 = Acharya|first3 = B. S|last4 = Adams|first4 = M|last5 = Adams|first5 = T|last6 = Agnew|first6 = J. P|last7 = Alexeev|first7 = G. D|last8 = Alkhazov|first8 = G|last9 = Alton|first9 = A|last10 = Askew|first10 = A|last11 = Atkins|first11 = S|last12 = Augsten|first12 = K|last13 = Avila|first13 = C|last14 = Badaud|first14 = F|last15 = Bagby|first15 = L|last16 = Baldin|first16 = B|last17 = Bandurin|first17 = D. V|last18 = Banerjee|first18 = S|last19 = Barberis|first19 = E|last20 = Baringer|first20 = P|last21 = Bartlett|first21 = J. F|last22 = Bassler|first22 = U|last23 = Bazterra|first23 = V|last24 = Bean|first24 = A|last25 = Begalli|first25 = M|last26 = Bellantoni|first26 = L|last27 = Beri|first27 = S. B|last28 = Bernardi|first28 = G|last29 = Bernhard|first29 = R|last30 = Bertram|first30 = I|title = Search for the X(4140) state in B+→J/ψφK+ decays with the D0 detector|journal = Physical Review D|volume = 89|issue = 12004|pages = 012004|year = 2013|doi = 10.1103/PhysRevD.89.012004|bibcode = 2014PhRvD..89a2004A|displayauthors = 29}} 8. ^{{cite journal | last = Shen| first = C. P. | year = 2010 | title = Evidence for a New Resonance and Search for the Y(4140) in the γγ→ϕJ/ψ Process | journal = Physical Review Letters | volume = 104 | issue = 11 | pages = 112004 | arxiv = 0912.2383 | bibcode = 2010PhRvL.104k2004S | doi = 10.1103/PhysRevLett.104.112004|display-authors=etal | pmid=20366468}} 9. ^{{Cite journal|arxiv = 1606.07895|author1=LHCb collaboration |title = Observation of J/ψφ structures consistent with exotic states from amplitude analysis of B+→J/ψφK+ decays|journal = Physical Review Letters|volume = 118|issue = 2|pages = 022003|last2 = Aaij|first2 = R|last3 = Adeva|first3 = B|last4 = Adinolfi|first4 = M|last5 = Ajaltouni|first5 = Z|last6 = Akar|first6 = S|last7 = Albrecht|first7 = J|last8 = Alessio|first8 = F|last9 = Alexander|first9 = M|last10 = Ali|first10 = S|last11 = Alkhazov|first11 = G|last12 = Alvarez Cartelle|first12 = P|last13 = Alves Jr|first13 = A. 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B|last23 = Aquines Gutierrez|first23 = O|last24 = Archilli|first24 = F|last25 = d'Argent|first25 = P|last26 = Arnau Romeu|first26 = J|last27 = Artamonov|first27 = A|last28 = Artuso|first28 = M|last29 = Aslanides|first29 = E|last30 = Auriemma|first30 = G|displayauthors = 29|year = 2016|doi = 10.1103/PhysRevLett.118.022003|pmid = 28128595|bibcode = 2017PhRvL.118b2003A}} 10. ^{{Cite journal|arxiv = 1606.07898|author1=LHBc collaboration |title = Amplitude analysis of B+→J/ψφK+ decays|journal = Physical Review D|volume = 95|issue = 12002|pages = 012002|last2 = Aaij|first2 = R|last3 = Adeva|first3 = B|last4 = Adinolfi|first4 = M|last5 = Ajaltouni|first5 = Z|last6 = Akar|first6 = S|last7 = Albrecht|first7 = J|last8 = Alessio|first8 = F|last9 = Alexander|first9 = M|last10 = Ali|first10 = S|last11 = Alkhazov|first11 = G|last12 = Alvarez Cartelle|first12 = P|last13 = Alves Jr|first13 = A. A|last14 = Amato|first14 = S|last15 = Amerio|first15 = S|last16 = Amhis|first16 = Y|last17 = An|first17 = L|last18 = Anderlini|first18 = L|last19 = Andreassi|first19 = G|last20 = Andreotti|first20 = M|last21 = Andrews|first21 = J. E|last22 = Appleby|first22 = R. B|last23 = Aquines Gutierrez|first23 = O|last24 = Archilli|first24 = F|last25 = d'Argent|first25 = P|last26 = Arnau Romeu|first26 = J|last27 = Artamonov|first27 = A|last28 = Artuso|first28 = M|last29 = Aslanides|first29 = E|last30 = Auriemma|first30 = G|displayauthors = 29|year = 2016|doi = 10.1103/PhysRevD.95.012002|bibcode = 2017PhRvD..95a2002A}} External links
Further reading
| last = Aaltonen | first = T. | year = 2009 | title = Evidence for a Narrow Near-Threshold Structure in the J/ψφ Mass Spectrum B+ → J/ψφK+ Decays | journal = Physical Review Letters | volume = 102 | issue = 24 | pages = 242002 | arxiv = 0903.2229 | bibcode = 2009PhRvL.102x2002A | doi = 10.1103/PhysRevLett.102.242002 | pmid = 19658999 |display-authors=etal}}
| last = Xiang | first = Liu | last2 = Zhu | first2 = Shi-Lin | year = 2009 | title = Y(4143) is probably a molecular partner of Y(3930) | journal = Physical Review D | volume = 80 | issue = 1 | pages = 017502 | arxiv = 0903.2529 | bibcode = 2009PhRvD..80a7502L | doi = 10.1103/PhysRevD.80.017502 }}
| last = Mahajan |first = Namit | year = 2009 | title = Y(4140): Possible options | journal = Physics Letters B | volume = 679 | issue = 3 | pages = 228–230 | arxiv=0903.3107 | bibcode = 2009PhLB..679..228M | doi = 10.1016/j.physletb.2009.07.043 }}{{particle-stub}} 1 : Mesons |
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