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New Upper Limit on Strange Quark Matter Abundance in Cosmic Rays with the PAMELA Space Experiment
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0001-7011-7229
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Number of Authors: 59
2015 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 115, no 11, 111101Article in journal (Refereed) Published
Abstract [en]

In this work we present results of a direct search for strange quark matter (SQM) in cosmic rays with the PAMELA space spectrometer. If this state of matter exists it may be present in cosmic rays as particles, called strangelets, having a high density and an anomalously high mass-to-charge (A/Z) ratio. A direct search in space is complementary to those from ground-based spectrometers. Furthermore, it has the advantage of being potentially capable of directly identifying these particles, without any assumption on their interaction model with Earth's atmosphere and the long-term stability in terrestrial and lunar rocks. In the rigidity range from 1.0 to similar to 1.0 x 10(3) GV, no such particles were found in the data collected by PAMELA between 2006 and 2009. An upper limit on the strangelet flux in cosmic rays was therefore set for particles with charge 1 <= Z <= 8 and mass 4 <= A <= 1.2 x 10(5). This limit as a function of mass and as a function of magnetic rigidity allows us to constrain models of SQM production and propagation in the Galaxy.

Place, publisher, year, edition, pages
[Adriani, O.; Bongi, M.; Spillantini, P.] Univ Florence, Dept Phys, I-50019 Florence, Italy. [Adriani, O.; Bongi, M.; Bottai, S.; Mori, N.; Papini, P.; Ricciarini, S. B.; Spillantini, P.; Vannuccini, E.] Ist Nazl Fis Nucl, Sez Florence, I-50019 Florence, Italy. [Barbarino, G. C.; Scotti, V.] Univ Naples Federico II, Dept Phys, I-80126 Naples, Italy. [Barbarino, G. C.; Campana, D.; Osteria, G.; Panico, B.; Scotti, V.] Ist Nazl Fis Nucl, Sez Naples, I-80126 Naples, Italy. [Bazilevskaya, G. A.; Kvashnin, A. N.; Stozhkov, Y. I.] PN Lebedev Phys Inst, RU-119991 Moscow, Russia. [Bellotti, R.; Bruno, A.; Monaco, A.] Univ Bari, Dept Phys, I-70126 Bari, Italy. [Bellotti, R.; Cafagna, F.; Monaco, A.] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy. [Boezio, M.; Bonvicini, V.; Formato, V.; Mocchiutti, E.; Munini, R.; Vacchi, A.; Zampa, G.; Zampa, N.] Ist Nazl Fis Nucl, Sez Trieste, I-34149 Trieste, Italy. [Bogomolov, E. A.; Krutkov, S. Y.; Vasilyev, G.] AF Ioffe Phys Tech Inst, RU-194021 St Petersburg, Russia. [Casolino, M.; De Donato, C.; De Santis, C.; De Simone, N.; Di Felice, V.; Merge, M.; Palma, F.; Picozza, P.; Sparvoli, R.] Ist Nazl Fis Nucl, Sez Rome Tor Vergata, I-00133 Rome, Italy. [De Donato, C.; Marcelli, L.; Martucci, M.; Merge, M.; Palma, F.; Picozza, P.; Sparvoli, R.] Univ Roma Tor Vergata, Dept Phys, I-00133 Rome, Italy. [Galper, A. M.; Karelin, A. V.; Koldashov, S. V.; Koldobskiy, S.; Leonov, A.; Malakhov, V.; Mayorov, A. G.; Mikhailov, V. V.; Voronov, S. A.; Yurkin, Y. T.] Natl Res Nucl Univ MEPhI, RU-115409 Moscow, Russia. [Carlson, P.; Pearce, M.] KTH, Dept Phys, SE-10691 Stockholm, Sweden. [Carlson, P.; Pearce, M.] AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden. [Casolino, M.] RIKEN, Adv Sci Inst, Wako, Saitama 3510198, Japan. [Castellini, G.; Ricciarini, S. B.] IFAC, I-50019 Florence, Italy. [Munini, R.] Univ Trieste, Dept Phys, I-34147 Trieste, Italy. [Menn, W.; Simon, M.] Univ Siegen, Dept Phys, D-57068 Siegen, Germany. [Di Felice, V.] ASI, Sci Data Ctr, I-00044 Frascati, Italy. [Martucci, M.; Ricci, M.] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. [Mori, N.] CSFNSM, I-95125 Catania, Italy. [Sarkar, R.] Indian Ctr Phys, Kolkata 700084, W Bengal, India., 2015. Vol. 115, no 11, 111101
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Physical Sciences
URN: urn:nbn:se:kth:diva-175590DOI: 10.1103/PhysRevLett.115.111101ISI: 000360893600005PubMedID: 26406816ScopusID: 2-s2.0-84942133911OAI: diva2:861481

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Available from: 2015-10-16 Created: 2015-10-16 Last updated: 2015-11-25Bibliographically approved

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