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1. Radiative decays of X(3872) discriminate between the molecular and compact interpretations

Author

Grinstein, B., Maiani, L., and Polosa, A. D.

Subjects
High Energy Physics - Phenomenology
Abstract

Radiative decays X --> psi(1S) + gamma and X --> psi(2S) + gamma might be expected to have a ratio of branching fractions following the phase space volumes ratio. However data suggest the opposite, indicating a value for R=B(X --> psi^prime + gamma) / B(X --> psi +gamma) consistently larger than one. In this paper we present a calculation of R for both a compact Born-Oppenheimer cc-bar q-qbar state and a DD^* molecule. In the former case R~1 or larger is found, a value to be confronted with forthcoming high statistics data analyses. In the molecular picture, with D and D^* mesons described by the universal wave function used by Voloshin, Braaten and Kusunoki, we find that R would be of order 10^-2. A more precise experimental measure would be extremely helpful in clarifying the true nature of the X(3872)., Comment: 12 pages, 9 figures

Published
2024

2. A Next-Generation Liquid Xenon Observatory for Dark Matter and Neutrino Physics

Author

Aalbers, J., Abe, K., Aerne, V., Agostini, F., Maouloud, S. Ahmed, Akerib, D. S., Akimov, D. Yu., Akshat, J., Musalhi, A. K. Al, Alder, F., Alsum, S. K., Althueser, L., Amarasinghe, C. S., Amaro, F. D., Ames, A., Anderson, T. J., Andrieu, B., Angelides, N., Angelino, E., Angevaare, J., Antochi, V. C., Martin, D. Antón, Antunovic, B., Aprile, E., Araújo, H. M., Armstrong, J. E., Arneodo, F., Arthurs, M., Asadi, P., Baek, S., Bai, X., Bajpai, D., Baker, A., Balajthy, J., Balashov, S., Balzer, M., Bandyopadhyay, A., Bang, J., Barberio, E., Bargemann, J. W., Baudis, L., Bauer, D., Baur, D., Baxter, A., Baxter, A. L., Bazyk, M., Beattie, K., Behrens, J., Bell, N. F., Bellagamba, L., Beltrame, P., Benabderrahmane, M., Bernard, E. P., Bertone, G. F., Bhattacharjee, P., Bhatti, A., Biekert, A., Biesiadzinski, T. P., Binau, A. R., Biondi, R., Biondi, Y., Birch, H. J., Bishara, F., Bismark, A., Blanco, C., Blockinger, G. M., Bodnia, E., Boehm, C., Bolozdynya, A. I., Bolton, P. D., Bottaro, S., Bourgeois, C., Boxer, B., Brás, P., Breskin, A., Breur, P. A., Brew, C. A. J., Brod, J., Brookes, E., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Bui, T. K., Burdin, S., Buse, S., Busenitz, J. K., Buttazzo, D., Buuck, M., Buzulutskov, A., Cabrita, R., Cai, C., Cai, D., Capelli, C., Cardoso, J. M. R., Carmona-Benitez, M. C., Cascella, M., Catena, R., Chakraborty, S., Chan, C., Chang, S., Chauvin, A., Chawla, A., Chen, H., Chepel, V., Chott, N. I., Cichon, D., Chavez, A. Cimental, Cimmino, B., Clark, M., Co, R. T., Colijn, A. P., Conrad, J., Converse, M. V., Costa, M., Cottle, A., Cox, G., Creaner, O., Garcia, J. J. Cuenca, Cussonneau, J. P., Cutter, J. E., Dahl, C. E., D'Andrea, V., David, A., Decowski, M. P., Dent, J. B., Deppisch, F. F., de Viveiros, L., Di Gangi, P., Di Giovanni, A., Di Pede, S., Dierle, J., Diglio, S., Dobson, J. E. Y., Doerenkamp, M., Douillet, D., Drexlin, G., Druszkiewicz, E., Dunsky, D., Eitel, K., Elykov, A., Emken, T., Engel, R., Eriksen, S. R., Fairbairn, M., Fan, A., Fan, J. J., Farrell, S. J., Fayer, S., Fearon, N. M., Ferella, A., Ferrari, C., Fieguth, A., Fiorucci, S., Fischer, H., Flaecher, H., Flierman, M., Florek, T., Foot, R., Fox, P. J., Franceschini, R., Fraser, E. D., Frenk, C. S., Frohlich, S., Fruth, T., Fulgione, W., Fuselli, C., Gaemers, P., Gaior, R., Gaitskell, R. J., Galloway, M., Gao, F., Garcia, I. Garcia, Genovesi, J., Ghag, C., Ghosh, S., Gibson, E., Gil, W., Giovagnoli, D., Girard, F., Glade-Beucke, R., Glück, F., Gokhale, S., de Gouvêa, A., Gráf, L., Grandi, L., Grigat, J., Grinstein, B., van der Grinten, M. G. D., Grössle, R., Guan, H., Guida, M., Gumbsheimer, R., Gwilliam, C. B., Hall, C. R., Hall, L. J., Hammann, R., Han, K., Hannen, V., Hansmann-Menzemer, S., Harata, R., Hardin, S. P., Hardy, E., Hardy, C. A., Harigaya, K., Harnik, R., Haselschwardt, S. J., Hernandez, M., Hertel, S. A., Higuera, A., Hils, C., Hochrein, S., Hoetzsch, L., Hoferichter, M., Hood, N., Hooper, D., Horn, M., Howlett, J., Huang, D. Q., Huang, Y., Hunt, D., Iacovacci, M., Iaquaniello, G., Ide, R., Ignarra, C. M., Iloglu, G., Itow, Y., Jacquet, E., Jahangir, O., Jakob, J., James, R. S., Jansen, A., Ji, W., Ji, X., Joerg, F., Johnson, J., Joy, A., Kaboth, A. C., Kamaha, A. C., Kanezaki, K., Kar, K., Kara, M., Kato, N., Kavrigin, P., Kazama, S., Keaveney, A. W., Kellerer, J., Khaitan, D., Khazov, A., Khundzakishvili, G., Khurana, I., Kilminster, B., Kleifges, M., Ko, P., Kobayashi, M., Kodroff, D., Koltmann, G., Kopec, A., Kopmann, A., Kopp, J., Korley, L., Kornoukhov, V. N., Korolkova, E. V., Kraus, H., Krauss, L. M., Kravitz, S., Kreczko, L., Kudryavtsev, V. A., Kuger, F., Kumar, J., Paredes, B. López, LaCascio, L., Laine, Q., Landsman, H., Lang, R. F., Leason, E. A., Lee, J., Leonard, D. S., Lesko, K. T., Levinson, L., Levy, C., Li, I., Li, S. C., Li, T., Liang, S., Liebenthal, C. S., Lin, J., Lin, Q., Lindemann, S., Lindner, M., Lindote, A., Linehan, R., Lippincott, W. H., Liu, X., Liu, K., Liu, J., Loizeau, J., Lombardi, F., Long, J., Lopes, M. I., Asamar, E. Lopez, Lorenzon, W., Lu, C., Luitz, S., Ma, Y., Machado, P. A. N., Macolino, C., Maeda, T., Mahlstedt, J., Majewski, P. A., Manalaysay, A., Mancuso, A., Manenti, L., Manfredini, A., Mannino, R. L., Marangou, N., March-Russell, J., Marignetti, F., Undagoitia, T. Marrodán, Martens, K., Martin, R., Martinez-Soler, I., Masbou, J., Masson, D., Masson, E., Mastroianni, S., Mastronardi, M., Matias-Lopes, J. A., McCarthy, M. E., McFadden, N., McGinness, E., McKinsey, D. N., McLaughlin, J., McMichael, K., Meinhardt, P., Menéndez, J., Meng, Y., Messina, M., Midha, R., Milisavljevic, D., Miller, E. H., Milosevic, B., Milutinovic, S., Mitra, S. A., Miuchi, K., Mizrachi, E., Mizukoshi, K., Molinario, A., Monte, A., Monteiro, C. M. B., Monzani, M. E., Moore, J. S., Morå, K., Morad, J. A., Mendoza, J. D. Morales, Moriyama, S., Morrison, E., Morteau, E., Mosbacher, Y., Mount, B. J., Mueller, J., Murphy, A. St. J., Murra, M., Naim, D., Nakamura, S., Nash, E., Navaieelavasani, N., Naylor, A., Nedlik, C., Nelson, H. N., Neves, F., Newstead, J. L., Ni, K., Nikoleyczik, J. A., Niro, V., Oberlack, U. G., Obradovic, M., Odgers, K., O'Hare, C. A. J., Oikonomou, P., Olcina, I., Oliver-Mallory, K., Oranday, A., Orpwood, J., Ostrovskiy, I., Ozaki, K., Paetsch, B., Pal, S., Palacio, J., Palladino, K. J., Palmer, J., Panci, P., Pandurovic, M., Parlati, A., Parveen, N., Patton, S. J., Pěč, V., Pellegrini, Q., Penning, B., Pereira, G., Peres, R., Perez-Gonzalez, Y., Perry, E., Pershing, T., Petrossian-Byrne, R., Pienaar, J., Piepke, A., Pieramico, G., Pierre, M., Piotter, M., Pizella, V., Plante, G., Pollmann, T., Porzio, D., Qi, J., Qie, Y., Qin, J., Raj, N., Silva, M. Rajado, Ramanathan, K., García, D. Ramírez, Ravanis, J., Redard-Jacot, L., Redigolo, D., Reichard, S., Reichenbacher, J., Rhyne, C. A., Richards, A., Riffard, Q., Rischbieter, G. R. C., Rocchetti, A., Rosenfeld, S. L., Rosero, R., Rupp, N., Rushton, T., Saha, S., Sanchez, L., Sanchez-Lucas, P., Santone, D., Santos, J. M. F. dos, Sarnoff, I., Sartorelli, G., Sazzad, A. B. M. R., Scheibelhut, M., Schnee, R. W., Schrank, M., Schreiner, J., Schulte, P., Schulte, D., Eissing, H. Schulze, Schumann, M., Schwemberger, T., Schwenk, A., Schwetz, T., Lavina, L. Scotto, Scovell, P. R., Sekiya, H., Selvi, M., Semenov, E., Semeria, F., Shagin, P., Shaw, S., Shi, S., Shockley, E., Shutt, T. A., Si-Ahmed, R., Silk, J. J., Silva, C., Silva, M. C., Simgen, H., Šimkovic, F., Sinev, G., Singh, R., Skulski, W., Smirnov, J., Smith, R., Solmaz, M., Solovov, V. N., Sorensen, P., Soria, J., Sparmann, T. J., Stancu, I., Steidl, M., Stevens, A., Stifter, K., Strigari, L. E., Subotic, D., Suerfu, B., Suliga, A. M., Sumner, T. J., Szabo, P., Szydagis, M., Takeda, A., Takeuchi, Y., Tan, P. -L., Taricco, C., Taylor, W. C., Temples, D. J., Terliuk, A., Terman, P. A., Thers, D., Thieme, K., Thümmler, Th., Tiedt, D. R., Timalsina, M., To, W. H., Toennies, F., Tong, Z., Toschi, F., Tovey, D. R., Tranter, J., Trask, M., Trinchero, G. C., Tripathi, M., Tronstad, D. R., Trotta, R., Tsai, Y. D., Tunnell, C. D., Turner, W. G., Ueno, R., Urquijo, P., Utku, U., Vaitkus, A., Valerius, K., Vassilev, E., Vecchi, S., Velan, V., Vetter, S., Vincent, A. C., Vittorio, L., Volta, G., von Krosigk, B., von Piechowski, M., Vorkapic, D., Wagner, C. E. M., Wang, A. M., Wang, B., Wang, Y., Wang, W., Wang, J. J., Wang, L. -T., Wang, M., Watson, J. R., Wei, Y., Weinheimer, C., Weisman, E., Weiss, M., Wenz, D., West, S. M., Whitis, T. J., Williams, M., Wilson, M. J., Winkler, D., Wittweg, C., Wolf, J., Wolf, T., Wolfs, F. L. H., Woodford, S., Woodward, D., Wright, C. J., Wu, V. H. S., Wu, P., Wüstling, S., Wurm, M., Xia, Q., Xiang, X., Xing, Y., Xu, J., Xu, Z., Xu, D., Yamashita, M., Yamazaki, R., Yan, H., Yang, L., Yang, Y., Ye, J., Yeh, M., Young, I., Yu, H. B., Yu, T. T., Yuan, L., Zavattini, G., Zerbo, S., Zhang, Y., Zhong, M., Zhou, N., Zhou, X., Zhu, T., Zhu, Y., Zhuang, Y., Zopounidis, J. P., Zuber, K., and Zupan, J.

Subjects
Physics - Instrumentation and Detectors, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Experiment, Nuclear Experiment
Abstract

The nature of dark matter and properties of neutrinos are among the most pressing issues in contemporary particle physics. The dual-phase xenon time-projection chamber is the leading technology to cover the available parameter space for Weakly Interacting Massive Particles (WIMPs), while featuring extensive sensitivity to many alternative dark matter candidates. These detectors can also study neutrinos through neutrinoless double-beta decay and through a variety of astrophysical sources. A next-generation xenon-based detector will therefore be a true multi-purpose observatory to significantly advance particle physics, nuclear physics, astrophysics, solar physics, and cosmology. This review article presents the science cases for such a detector., Comment: 77 pages, 40 figures, 1262 references

Published
2022
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3. Opportunities in Flavour Physics at the HL-LHC and HE-LHC

Author

Cerri, A., Gligorov, V. V., Malvezzi, S., Camalich, J. Martin, Zupan, J., Akar, S., Alimena, J., Allanach, B. C., Altmannshofer, W., Anderlini, L., Archilli, F., Azzi, P., Banerjee, S., Barter, W., Barton, A. E., Bauer, M., Belyaev, I., Benson, S., Bettler, M., Bhattacharya, R., Bifani, S., Birnkraut, A., Bishara, F., Blake, T., Blusk, S., Boos, E., Borsato, M., Bozzi, C., Bragagnolo, A., Brod, J., Brodzicka, J., Buras, A. J., Cadamuro, L., Carbone, A., Carena, M., Carli, I., Carmona, A., Cavallo, F. R., Celis, A., Cepeda, M., Chahal, G. S., Chala, M., Charles, J., Charles, M., Chen, K. F., Chobanova, V., Chrzaszcz, M., Ciezarek, G., Cirigliano, V., Ciuchini, M., Cliff, H., Cogan, J., Colangelo, G., Contu, A., Covarelli, R., Cowan, G., Crivellin, A., D'Ambrosio, G., D'Onofrio, M., Dang, N. P., Davis, A., Francisco, O. A. De Aguiar, De Bruyn, K., De Sanctis, U., De la Torre, H., Dekens, W., Deliot, F., Della Morte, M., Demers, S., Derkach, D., Deschamps, O., Descotes-Genon, S., Dettori, F., Di Canto, A., Dinardo, M., Dini, P., Dordei, F., Dorigo, M., Reis, A. dos, Dudko, L., Dufour, L., Durieux, G., Dutta, S., Dziurda, A., Eitschberger, U., Esposito, A., Estevez, M., Fajfer, S., Falkowski, A., Faroughy, D. A., Fedi, G., Fiorendi, S., Fiori, F., Fitzpatrick, C., Fleischer, R., Fontana, M., Fox, P. J., Freytsis, M., Gámiz, E., Gabriel, E., Gambino, P., Pardiñas, J. García, Geng, L. S., Gersabeck, E., Gersabeck, M., Gershon, T., Gilbert, A., Gonzalez-Alonso, M., Govoni, P., Graziani, G., Greljo, A., Grillo, L., Grinstein, B., Grohsjean, A., Grossman, Y., Guadagnoli, D., Guo, F. -K., Guzzi, L., Haller, J., Hamilton, B., Han, T., Harnik, R., Hill, D., Hiller, G., Hoepfner, K., Hogan, J. M., Hurth, T., Igonkina, O., Ilten, P., Isidori, G., Jain, Sa., John, M., Johnson, D., Jung, M., Jurik, N., Jäger, S., Kado, M., Kagan, A. L., Kamenik, J. F., Karliner, M., Kenzie, M., Khanji, B., Kieseler, J., Kitahara, T., Klijnsma, T., Knecht, M., Košnik, N., Kogler, R., Koppenburg, P., Korytov, A., Kreps, M., Langenbruch, C., Langenegger, U., Latham, T., Lebed, R. F., Lenz, A. J., Leonardo, N., Leroy, O., Li, Q., Li, T., Ligabue, F., Ligeti, Z., Long, K., Lunghi, E., Mahmoudi, F., Mancinelli, G., Mandrik, P., Mannel, T., Marcano, X., Marchand, J. F., Santos, D. Martínez, Martin, A., Martinelli, M., Vidal, F. Martinez, Marzocca, D., Matias, J., Cuevas, P. Matorras, Matsedonskyi, O., Mauri, A., Mazumdar, K., Merk, M., Meyer, A. B., Michielin, E., Mitselmakher, G., Mittnacht, L., Monteil, S., Morello, M. J., Morgenstern, M., Narain, M., Nardecchia, M., Needham, M., Neri, N., Neubert, M., Neubert, S., Nierste, U., Nieves, J., Nir, Y., Nisati, A., O'Hanlon, D. P., Oset, E., Owen, P., Ozcelik, O., Griso, S. Pagan, Cortezon, E. Palencia, Palla, F., Palutan, M., Pappagallo, M., Parkes, C., Pascoli, S., Passaleva, G., Passemar, E., Patel, M., Pearce, A., Pedro, K., Perazzini, S., Perfilov, M., Perrozzi, L., Pescatore, L., Petersen, B. A., Petrov, A. A., Pich, A., Pilloni, A., Polci, F., Polosa, A. D., Prelovsek, S., Navarro, A. Puig, Punzi, G., Rademacker, J., Rama, M., Reboud, M., Reimers, A., Reznicek, P., Robinson, D. J., Rosner, J. L., Ruiz, R., Saito, S., Sarkar, S., Savin, A., Sawant, S., Schacht, S., Schlaffer, M., Schmidt, A., Schneider, B., Schopper, A., Schune, M. H., Segovia, J., Selvaggi, M., Serra, N., Servant, G., Sestini, L., Shih, D., Coutinho, R. Silva, Silvestrini, L., Skovpen, K., Skwarnicki, T., Smizanska, M., Soni, A., Soreq, Y., Spannowsky, M., Spradlin, P., Stamou, E., Stone, S., Stracka, S., Straub, D. M., Szczepaniak, A. P, T'Jampens, S., Takahashi, Y., Teubert, F., Thomas, E., Tisserand, V., Torre, R., Tresoldi, F., Tsiakkouri, D., Turchikhin, S., Ulmer, K. A., Vagnoni, V., van Dyk, D., van Tilburg, J., Vecchi, S., Venditti, R., Vesterinen, M., Virto, J., Volkov, P., Vorotnikov, G., Vryonidou, E., Walder, J., Walkowiak, W., Wang, J., Wang, W., Weiland, C., Whitehead, M., Wilkinson, G., Williams, J. M., Williams, M. R. J., Wilson, F., Xie, Y., Yang, Z., Yazgan, E., You, T., Yu, F., Zhang, C., Zhang, L., and Zhang, W.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

Motivated by the success of the flavour physics programme carried out over the last decade at the Large Hadron Collider (LHC), we characterize in detail the physics potential of its High-Luminosity and High-Energy upgrades in this domain of physics. We document the extraordinary breadth of the HL/HE-LHC programme enabled by a putative Upgrade II of the dedicated flavour physics experiment LHCb and the evolution of the established flavour physics role of the ATLAS and CMS general purpose experiments. We connect the dedicated flavour physics programme to studies of the top quark, Higgs boson, and direct high-$p_T$ searches for new particles and force carriers. We discuss the complementarity of their discovery potential for physics beyond the Standard Model, affirming the necessity to fully exploit the LHC's flavour physics potential throughout its upgrade eras., Comment: Report from Working Group 4 on the Physics of the HL-LHC, and Perspectives at the HE-LHC, 292 pages

Published
2018

4. Lepton non-universality in $B$ decays and fermion mass structure

Author

Grinstein, B., Pokorski, S., and Ross, G. G.

Subjects
High Energy Physics - Phenomenology
Abstract

We consider the possibility that the neutral-current $B$ anomalies are due to radiative corrections generated by Yukawa interactions of quarks and leptons with new vector-like quark and lepton electroweak doublets and new Standard Model singlet scalars. We show that the restricted interactions needed can result from an underlying Abelian family symmetry and that the same symmetry can give rise to an acceptable pattern of quark and charged lepton masses and mixings, providing a bridge between the non-universality observed in the B-sector and that of the fermion mass matrices. We construct two simple models, one with a single singlet scalar in which the flavour changing comes from quark and lepton mixing and one with an additional scalar in which the flavour changing can come from both fermion and scalar mixing. We show that for the case the new quarks are much heavier than the new leptons and scalars the $B$ anomalies can be due to box diagrams with couplings in the perturbative regime consistent with the bounds coming from $B_s- \bar B_s$, $K- \bar K$ and $D- \bar D$ mixing as well as other lepton family number violating processes. The new states can be dark matter candidates and, in the two scalar model with a light scalar of O(60) GeV and vector-like lepton of O(100) GeV, there can be a simultaneous explanation of the B-anomalies, the muon anomalous magnetic moment and the dark matter abundance., Comment: Replacement contains few additional references

Published
2018
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6. Gauged Lepton Flavour

Author

Alonso, R., Martinez, E. Fernandez, Gavela, M. B., Grinstein, B., Merlo, L., and Quilez, P.

Subjects
High Energy Physics - Phenomenology
Abstract

The gauging of the lepton flavour group is considered in the Standard Model context and in its extension with three right-handed neutrinos. The anomaly cancellation conditions lead to a Seesaw mechanism as underlying dynamics for all leptons; requiring in addition a phenomenologically viable setup leads to Majorana masses for the neutral sector: the type I Seesaw Lagrangian in the Standard Model case and the inverse Seesaw in the extended model. Within the minimal extension of the scalar sector, the Yukawa couplings are promoted to scalar fields in the bifundamental of the flavour group. The resulting low-energy Yukawa couplings are proportional to inverse powers of the vacuum expectation values of those scalars; the protection against flavour changing neutral currents differs from that of Minimal Flavor Violation. In all cases, the $\mu-\tau$ flavour sector exhibits rich and promising phenomenological signals., Comment: 42 pages, 9 figures, 2 tables; revised argument in section 2, results unchanged, references added

Published
2016
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7. Ultraviolet Properties of the Higgs Sector in the Lee-Wick Standard Model

Author

Espinosa, J. R. and Grinstein, B.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Theory
Abstract

The Lee-Wick (LW) Standard Model (SM) offers a new solution to the hierarchy problem. We discuss, using effective potential techniques, its peculiar ultraviolet (UV) behaviour. We show how quadratic divergences in the Higgs mass Mh cancel as a result of the unusual dependence of LW fields on the Higgs background (in a manner reminiscent of Little Higgses). We then extract from the effective potential the renormalization group evolution of the Higgs quartic coupling lambda above the LW scale. After clarifying an apparent discrepancy with previous results for the LW Abelian Higgs model we focus on the LWSM. In contrast with the SM case, for any Mh, lambda grows monotonically and hits a Landau pole at a fixed trans-Planckian scale (never turning negative in the UV). Then, the perturbativity and stability bounds on Mh disappear. We identify a cutoff ~10^{16} GeV for the LWSM due to the hypercharge gauge coupling hitting a Landau pole. Finally, we also discuss briefly the possible impact of the UV properties of the LW models on their behaviour at finite temperature, in particular regarding symmetry nonrestoration., Comment: 25 pages, 3 figures

Published
2011
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8. More loosely bound hadron molecules at CDF?

Author

Bignamini, C, Grinstein, B, Piccinini, F, Polosa, AD, Riquer, V, and Sabelli, C

Subjects
High Energy Physics - Phenomenology
Abstract

In a recent paper we have proposed a method to estimate the prompt production cross section of X(3872) at the Tevatron assuming that this particle is a loosely bound molecule of a D and a D*bar meson. Under this hypothesis we find that it is impossible to explain the high prompt production cross section found by CDF at sigma(X(3872)) \sim 30-70 nb as our theoretical prediction is about 300 times smaller than the measured one. Following our work, Artoisenet and Braaten, have suggested that final state interactions in the DD*bar system might be so strong to push the result we obtained for the cross section up to the experimental value. Relying on their conclusions we show that the production of another very narrow loosely bound molecule, the X_s=D_s D_s*bar, could be similarly enhanced. X_s should then be detectable at CDF with a mass of 4080 MeV and a prompt production cross section of sigma(X_s) \sim 1-3 nb., Comment: Minor revisions made. To appear in Phys Lett B

Published
2009
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9. Is the X(3872) Production Cross Section at Tevatron Compatible with a Hadron Molecule Interpretation?

Author

Bignamini, C, Grinstein, B, Piccinini, F, Polosa, AD, and Sabelli, C

Subjects
High Energy Physics - Phenomenology
Abstract

The X(3872) is universally accepted to be an exotic hadron. In this letter we assume that the X(3872) is a D0 \bar D0* molecule, as claimed by many authors, and attempt an estimate of its prompt production cross section at Tevatron. A comparison with CDF data allows to draw some qualitative conclusions about this statement., Comment: 4 pages, 4 figures, accepted for publication in Phys. Rev. Lett

Published
2009
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10. A note on large N scalar QCD_2

Author

Grinstein, B, Jora, R, and Polosa, AD

Subjects
High Energy Physics - Phenomenology
Abstract

We review the features of the bound state equation in large N scalar QCD in two dimensions, the 't Hooft model, and compute the discrete hadron mass spectrum in this theory. We make the Ansatz that the scalar fields of this model represent spin zero diquarks and we estimate the minimum allowed mass for the first radial excitation of the lowest diquark-antidiquark scalar meson. The discussion is extended to the case of spin one diquarks., Comment: 9 pages, 1 figure

Published
2008
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11. Decay b -> (c\bar{c}) s in the leading logarithm approximation

Author

Bobeth, C., Grinstein, B., and Savrov, M.

Subjects
High Energy Physics - Phenomenology
Abstract

We consider an effective field theory for the nonleptonic decay in which a heavy quark decays into a pair of a heavy quark and antiquark having a small relative velocity and one relativistic (massless) quark. This effective theory is a combination of HQET, SCET, and a covariant modification of NRQCD. In the leading logarithm approximation the effective theory decay amplitude factorizes into the product of matrix elements of heavy-to-heavy and heavy-to-light currents. We discuss a possibility of factorization beyond the leading logarithm approximation and find it doubtful. The Wilson coefficients of the effective theory electro-weak (EWET) Lagrangian in the next-to-the leading logarithm approximation are calculated at the matching scale of the decay. The differential decay rate for the inclusive decay B -> J/\psi+h in the effective theory framework is evaluated., Comment: 29 pages, 13 figures; v2: added preprint numbers, acknowledgements; v3: minor corrections and references added to match the journal version

Published
2007
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12. The Discovery Potential of a Super B Factory

Author

Hewett, JoAnne. L., Hitlin, David G., Abe, T., Agashe, K., Albert, J., Ali, A., Atwood, D., Bauer, C., Bernard, C., Bigi, I., Buras, A. J., Burdman, G., Ciuchini, M., Convery, M., Dasu, S., Datta, A., Datta, M., Dedes, A., del Re, D., Demir, D. A., Di Lodovico, F., Dujmic, D., Eigen, G., Egede, U., Falk, A., Feldmann, Th., Gopalakrishna, S., Goto, T., Graziani, K., Grinstein, B., Gritsan, A., Gronau, M., Grossman, Y., Hashimoto, S., Hazumi, M., Hewett, J., Hiller, G., Hisano, J., Hitlin, D. G., Hulsbergen, W., Hurth, T., Igonkina, O., Isidori, G., Jessop, C., Kagan, A. L., Ko, P., Kolda, C., Koppenburg, P., Koptchev, V., Krueger, F., Langenegger, U., Libby, J., Ligeti, Z., Lillie, B., London, D., Luke, M., Lunghi, E., Mackenzie, P., Manohar, A., Matchev, K., Moore, T., Neubert, M., Oh, S., Okada, Y., Parkhomenko, Y., Petrov, A. A., Pirjol, D., Poschenrieder, A., Purohit, M., Quinn, H., Rizzo, T. G., Robertson, S. H., Roodman, A., Rosner, J., Rothstein, I., Rubin, A., Ryd, A., Shelkov, V. G., Shimizu, Y., Shindou, T., Silvestrini, L., Sinha, N., Sinha, R., Soffer, A., Soni, A., Spranger, M., Staengle, H., Stewart, I., Tanaka, M., Vempati, S. K., Vives, O., Voloshin, M., Weiler, A., Wells, J. D., Wilkinson, G., Williams, D. C., Willocq, S., Wyler, D., and Zupan, J.

Subjects
High Energy Physics - Phenomenology
Abstract

The Proceedings of the 2003 SLAC Workshops on flavor physics with a high luminosity asymmetric e+e- collider. The sensitivity of flavor physics to physics beyond the Standard Model is addressed in detail, in the context of the improvement of experimental measurements and theoretical calculations., Comment: 476 pages. Printed copies may be obtained by request to kwebb@slac.stanford.edu . arXiv admin note: v2 appears to be identical to v1

Published
2005

13. Testing factorization in B -> D(*)X decays

Author

Bauer, C. W., Grinstein, B., Pirjol, D., and Stewart, I. W.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

In QCD the amplitude for B0 -> D(*)+pi- factorizes in the large Nc limit or in the large energy limit Q >> Lambda_QCD where Q = {m_b, m_c, m_b-m_c}. Data also suggests factorization in exclusive processes B-> D* pi+ pi- pi- pi0 and B-> D* omega pi-, however by themselves neither large Nc nor large Q can account for this. Noting that the condition for large energy release in B0-> D+ pi- is enforced by the SV limit, m_b, m_c >> m_b-m_c >> Lambda, we propose that the combined large Nc and SV limits justify factorization in B -> D(*) X. This combined limit is tested with the inclusive decay spectrum measured by CLEO. We also give exact large Nc relations among isospin amplitudes for B -> D(*)X and B -> D(*) D-bar(*)X, which can be used to test factorization through exclusive or inclusive measurements. Predictions for the modes B-> D(*) pi pi, B-> D(*)K K-bar and B-> D(*) D-bar(*) K are discussed using available data., Comment: 15 pages, 3 included .eps figures, minor changes

Published
2002
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14. Model-Independent Semileptonic Form Factors Using Dispersion Relations

Author

Boyd, C. G., Grinstein, B., and Lebed, R.

Subjects
High Energy Physics - Phenomenology
Abstract

We present a method for parametrizing heavy meson semileptonic form factors using dispersion relations, and from it produce a two-parameter description of the B -> B elastic form factor. We use heavy quark symmetry to relate this function to B -> D* l nu form factors, and extract |V_cb|=0.0355^{+0.0029}_{-0.0025} from experimental data with a least squares fit. Our method eliminates model-dependent uncertainties inherent in choosing a parametrization for the extrapolation of the differential decay rate to threshold., Comment: uses lanlmac(harvmac) and epsf, 12 pages, 1 eps figure included (Talk by BG at the 6-th International Symposium on Heavy Flavour Physics, Pisa, Italy, 6--10 June, 1995)

Published
1995
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15. Chiral and Heavy Quark Symmetry Violation in B Decays

Author

Boyd, C. G. and Grinstein, B.

Subjects
High Energy Physics - Phenomenology
Abstract

The most general Lagrangian consistent with chiral, heavy quark, and strong interaction symmetries to order $1/M$ and to linear order in the SU(3) vector and axial currents is presented. Two new dimensionful and five dimensionless couplings arise at this order. The heavy to light flavor changing current is derived to the same order, giving rise to two additional dimensionful constants and six dimensionless ones. The dimensionless parameters are shown to be irrelevant at \ord. The leading nonanalytic heavy quark and chiral symmetry violating corrections to heavy meson decay constants are computed, and implications to B decays are discussed; measurements of the experimentally accessible form factors for $D \to \pi l \nu$ and $B \to \pi l \nu$, along with knowledge of the $D^* D \pi$ coupling, determine the eight decay constants $f_D$, $f_{D_s}$, $f_{D^*}$, $f_{D_s^*}$, $f_B$, $ f_{B_s}$, $f_{B^*}$, and $f_{B_s^*}$, as well as one relation among the $B \to \pi l \nu$ form factors, to \ord~. The ratio $R_1 = \frac{f_{B_s}}{f_B}/\frac{f_{D_s}}{f_D}$ is expressed in terms of two dimensionful couplings., Comment: 22 pages, harvmac, 5 eps figs, resubmitted for automated postscript

Published
1994
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16. Chiral Perturbation Theory for $f_{D_S}/f_D$ and $B_{B_S}/B_{B}$

Author

Grinstein, B., Jenkins, E., Manohar, A. V., Savage, M. J., and Wise, M. B.

Subjects
High Energy Physics - Phenomenology
Abstract

The decay constants for the $D$ and $D_S$ mesons, denoted $f_D$ and $f_{D_S}$ respectively, are equal in the $SU(3)_V$ limit, as are the hadronic amplitudes for $B_S-\bar B_S$ and $B^0-\bar B^0$ mixing. The leading $SU(3)_V$ violating contribution to $\left( f_{D_S} / f_D \right)$ and to the ratio of hadronic matrix elements relevant for $B_S-\bar B_S$ and $B^0-\bar B^0$ mixing amplitudes are calculated in chiral perturbation theory. We discuss the formalism needed to include both meson and anti-meson fields in the heavy quark effective theory., Comment: 10 pages, 2 figures

Published
1992
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